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CN-122028604-A - Organic electroluminescent element and electronic device including the same

CN122028604ACN 122028604 ACN122028604 ACN 122028604ACN-122028604-A

Abstract

The present invention provides an organic electroluminescent element having further improved element performance by including a combination of specific compounds, and an electronic device including the same. The organic electroluminescent element according to one embodiment includes a compound represented by formula (A1) and a compound represented by formula (A2). The organic electroluminescent element according to another embodiment includes a compound represented by formula (B1) and a compound represented by formula (B2). (A1) (A2) (B1) (B2) (each symbol in the formulae is as defined in the specification.)

Inventors

  • Koh Yusuke
  • KUDO YUTAKA
  • Tazaki Somi
  • NAKAMURA TOMOHIRO

Assignees

  • 出光兴产株式会社

Dates

Publication Date
20260512
Application Date
20251110
Priority Date
20241111

Claims (20)

  1. 1. An organic electroluminescent element comprising a first electrode, a second electrode, and an organic layer formed between the first electrode and the second electrode, wherein, The organic layer includes: a light emitting layer; A hole transport layer formed between the light emitting layer and the first electrode, and A light-emitting auxiliary layer formed between the hole transport layer and the light-emitting layer, The light-emitting layer contains a light-emitting compound that exhibits light emission with a maximum peak wavelength of 600nm to 640nm or 500nm to 550nm, The hole transport layer contains a compound represented by the following formula (A1), The light-emitting auxiliary layer contains a compound represented by the following formula (A2), (A1) (A2) In the formula (A1), the amino acid sequence, N is a central nitrogen atom, and the nitrogen atom, L a1 、L a2 and L a3 are each independently a single bond, a substituted or unsubstituted arylene group having 6 to 18 ring-forming carbon atoms, or a substituted or unsubstituted divalent heterocyclic group having 5 to 30 ring-forming carbon atoms, Ar a2 is a substituted or unsubstituted aryl group having 6 to 30 ring-forming carbon atoms, a substituted or unsubstituted heterocyclic group having 5 to 30 ring-forming carbon atoms, or a substituted or unsubstituted cycloalkyl group having 5 to 30 ring-forming carbon atoms, In the formula (A2) of the present invention, N is a central nitrogen atom, and the nitrogen atom, X b represents an oxygen atom or a sulfur atom, One selected from R 1 ～R 8 is a single bond to x 2, Selected from R 1 ～R 8 is not a single bond with x 2 and two adjacent are optionally bonded to each other to form a substituted or unsubstituted benzene ring or are not bonded to each other to form a ring, R 1 ～R 8 which is not a single bond with x 2 and two adjacent ones are not bonded with each other is a hydrogen atom, L b1 、L b2 and L b3 are each independently a single bond, a substituted or unsubstituted arylene group having 6 to 18 ring-forming carbon atoms, or a substituted or unsubstituted divalent heterocyclic group having 5 to 30 ring-forming carbon atoms, Ar a3 in the formula (A1) and Ar b2 and Ar b3 in the formula (A2) are each independently a group represented by any one of the following formulas (a) to (e): In the formula (a), the amino acid sequence of the formula (a), R 10 ～R 25 is independently a hydrogen atom, a substituted or unsubstituted alkyl group having 1 to 50 carbon atoms, a substituted or unsubstituted cycloalkyl group having 3 to 50 ring-forming carbon atoms, a halogen atom, a cyano group, a nitro group, a substituted or unsubstituted aryl group having 6 to 30 ring-forming carbon atoms, or a substituted or unsubstituted heterocyclic group having 5 to 50 ring-forming carbon atoms, Wherein one selected from R 10 ～R 14 is a single bond bonded to f, One selected from R 15 ～R 20 is a single bond to g, the other selected from R 15 ～R 20 is a single bond to h, * Represents the position of bonding to L a3 、L b2 or L b3 , M1 is 0 or 1, n1 is 0 or 1, When m1 is 0 and n1 is 0, h is bonded to L a3 、L b2 or L b3 , When m1 is 0 and n1 is 1, f is bonded to L a3 、L b2 or L b3 , When m1 is 1 and n1 is 0, one selected from R 10 ～R 14 is a single bond bonded to h, And k1 is 1 or 2, and the number of the groups is 1, Two adjacent ones selected from R 10 ～R 14 which are not the single bond, and two adjacent ones selected from R 15 ～R 20 which are not any of the single bonds are not bonded to each other without forming a ring structure, In the formula (b) of the present invention, R 10 ～R 20 , # f, # g, # h, are the same as above, R 26 ～R 33 is independently a hydrogen atom, a substituted or unsubstituted alkyl group having 1 to 50 carbon atoms, a substituted or unsubstituted cycloalkyl group having 3 to 50 ring-forming carbon atoms, a halogen atom, a cyano group, a nitro group, a substituted or unsubstituted aryl group having 6 to 30 ring-forming carbon atoms, or a substituted or unsubstituted heterocyclic group having 5 to 50 ring-forming carbon atoms, Wherein one selected from R 26 ～R 33 is a single bond to i, M2 is 0 or 1, n2 is 0 or 1, When m2 is 0 and n2 is 0, h is bonded to L a3 、L b2 or L b3 , When m2 is 0 and n2 is 1, f is bonded to L a3 、L b2 or L b3 , When m2 is 1 and n2 is 0, one selected from R 10 ～R 14 is a single bond to h, Two adjacent ones selected from R 10 ～R 14 which are not the single bond, and two adjacent ones selected from R 15 ～R 20 which are not any of the single bonds are not bonded to each other without forming a ring structure, In the formula (c) of the present invention, R 10 ～R 20 , # f, # g, # h, are the same as above, R 34 ～R 43 is independently a hydrogen atom, a substituted or unsubstituted alkyl group having 1 to 50 carbon atoms, a substituted or unsubstituted cycloalkyl group having 3 to 50 ring-forming carbon atoms, a halogen atom, a cyano group, a nitro group, a substituted or unsubstituted aryl group having 6 to 30 ring-forming carbon atoms, or a substituted or unsubstituted heterocyclic group having 5 to 50 ring-forming carbon atoms, Wherein one selected from R 34 ～R 43 is a single bond bonded to j, M3 is 0 or 1, n3 is 0 or 1, When m3 is 0 and n3 is 0, h is bonded to L a3 、L b2 or L b3 , When m3 is 0 and n3 is 1, f is bonded to L a3 、L b2 or L b3 , When m3 is 1 and n3 is 0, one selected from R 10 ～R 14 is a single bond to h, Two selected from R 10 ～R 14 which are not the single bond and are adjacent, two selected from R 15 ～R 20 which are not any of the single bonds and are adjacent, and R 34 and R 35 are not bonded to each other without forming a ring structure, In the formula (d), the amino acid sequence of the formula (d), R 10 ～R 14 , f are the same as above, R 44 ～R 51 is independently a hydrogen atom, a substituted or unsubstituted alkyl group having 1 to 50 carbon atoms, a substituted or unsubstituted cycloalkyl group having 3 to 50 ring-forming carbon atoms, a halogen atom, a cyano group, a nitro group, a substituted or unsubstituted aryl group having 6 to 30 ring-forming carbon atoms, or a substituted or unsubstituted heterocyclic group having 5 to 50 ring-forming carbon atoms, X is an oxygen atom, a sulfur atom, CR a R b or NR c , R a 、R b and R c are each independently a hydrogen atom, a substituted or unsubstituted alkyl group having 1 to 50 carbon atoms, a substituted or unsubstituted aryl group having 6 to 50 ring-forming carbon atoms, or a substituted or unsubstituted heterocyclic group having 5 to 50 ring-forming carbon atoms, or R a and R b are optionally bonded to each other to form a substituted or unsubstituted ring structure, Wherein one selected from R 44 ～R 51 is a single bond bonded to k, M4 is 0 or 1 and the number of the groups, When m4 is 0, f is bonded to L a3 、L b2 or L b3 , Selected from R 44 ～R 51 is not the single bond and two adjacent ones are optionally bonded to each other independently to form a substituted or unsubstituted ring structure, In the formula (e) of the present invention, R 10 ～R 14 , f are the same as above, R 52 ～R 66 is independently a hydrogen atom, a substituted or unsubstituted alkyl group having 1 to 50 carbon atoms, a substituted or unsubstituted cycloalkyl group having 3 to 50 ring-forming carbon atoms, a halogen atom, a cyano group, a nitro group, a substituted or unsubstituted aryl group having 6 to 30 ring-forming carbon atoms, or a substituted or unsubstituted heterocyclic group having 5 to 50 ring-forming carbon atoms, Wherein one selected from R 52 ～R 56 is a single bond with l, the other selected from R 52 ～R 56 is a single bond with m, M5 is 0 or 1 and the number of the groups, When m5 is 0, f is bonded to L a3 、L b2 or L b3 , Two selected from R 10 ～R 14 which are not the single bond and are adjacent, two selected from R 52 ～R 56 which are not any of the single bonds and are adjacent, R 52 and R 61 , and R 56 and R 57 are not bonded to each other without forming a ring structure.
  2. 2. An organic electroluminescent element comprising a first electrode, a second electrode, and an organic layer formed between the first electrode and the second electrode, wherein, The organic layer includes: a light emitting layer; A hole transport layer formed between the light emitting layer and the first electrode, and A plurality of light-emitting auxiliary layers formed between the hole transport layer and the light-emitting layer, The plurality of light-emitting auxiliary layers includes a light-emitting auxiliary layer a adjacent to the hole transport layer and a light-emitting auxiliary layer b adjacent to the light-emitting layer, The hole transport layer contains a compound represented by the following formula (B1) or a diamine, The light-emitting auxiliary layer B contains a compound represented by the following formula (B2), (B1) (B2) In the formula (B1), the amino acid sequence of the formula (B), N is a central nitrogen atom, and the nitrogen atom, L a1 、L a2 and L a3 are each independently a single bond, a substituted or unsubstituted arylene group having 6 to 18 ring-forming carbon atoms, or a substituted or unsubstituted divalent heterocyclic group having 5 to 30 ring-forming carbon atoms, In the formula (B2), the amino acid sequence of the formula (B2), N is a central nitrogen atom, and the nitrogen atom, Ar b1 is a substituted or unsubstituted aryl group having 6 to 30 ring-forming carbon atoms, a substituted or unsubstituted heterocyclic group having 5 to 30 ring-forming carbon atoms, or a substituted or unsubstituted cycloalkyl group having 5 to 30 ring-forming carbon atoms, L b1 、L b2 and L b3 are each independently a single bond, a substituted or unsubstituted arylene group having 6 to 18 ring-forming carbon atoms, or a substituted or unsubstituted divalent heterocyclic group having 5 to 30 ring-forming carbon atoms, Ar a3 in the formula (B1) and Ar b2 and Ar b3 in the formula (B2) are each independently a group represented by any one of the following formulas (a) to (e): In the formula (a), the amino acid sequence of the formula (a), R 10 ～R 25 is independently a hydrogen atom, a substituted or unsubstituted alkyl group having 1 to 50 carbon atoms, a substituted or unsubstituted cycloalkyl group having 3 to 50 ring-forming carbon atoms, a halogen atom, a cyano group, a nitro group, a substituted or unsubstituted aryl group having 6 to 30 ring-forming carbon atoms, or a substituted or unsubstituted heterocyclic group having 5 to 50 ring-forming carbon atoms, Wherein one selected from R 10 ～R 14 is a single bond bonded to f, One selected from R 15 ～R 20 is a single bond to g, the other selected from R 15 ～R 20 is a single bond to h, * Represents the position of bonding to L a3 、L b2 or L b3 , M1 is 0 or 1, n1 is 0 or 1, When m1 is 0 and n1 is 0, h is bonded to L a3 、L b2 or L b3 , When m1 is 0 and n1 is 1, f is bonded to L a3 、L b2 or L b3 , When m1 is 1 and n1 is 0, one selected from R 10 ～R 14 is a single bond bonded to h, And k1 is 1 or 2, and the number of the groups is 1, Two adjacent ones selected from R 10 ～R 14 which are not the single bond, and two adjacent ones selected from R 15 ～R 20 which are not any of the single bonds are not bonded to each other without forming a ring structure, In the formula (b) of the present invention, R 10 ～R 20 , # f, # g, # h, are the same as above, R 26 ～R 33 is independently a hydrogen atom, a substituted or unsubstituted alkyl group having 1 to 50 carbon atoms, a substituted or unsubstituted cycloalkyl group having 3 to 50 ring-forming carbon atoms, a halogen atom, a cyano group, a nitro group, a substituted or unsubstituted aryl group having 6 to 30 ring-forming carbon atoms, or a substituted or unsubstituted heterocyclic group having 5 to 50 ring-forming carbon atoms, Wherein one selected from R 26 ～R 33 is a single bond to i, M2 is 0 or 1, n2 is 0 or 1, When m2 is 0 and n2 is 0, h is bonded to L a3 、L b2 or L b3 , When m2 is 0 and n2 is 1, f is bonded to L a3 、L b2 or L b3 , When m2 is 1 and n2 is 0, one selected from R 10 ～R 14 is a single bond to h, Two adjacent ones selected from R 10 ～R 14 which are not the single bond, and two adjacent ones selected from R 15 ～R 20 which are not any of the single bonds are not bonded to each other without forming a ring structure, In the formula (c) of the present invention, R 10 ～R 20 , # f, # g, # h, are the same as above, R 34 ～R 43 is independently a hydrogen atom, a substituted or unsubstituted alkyl group having 1 to 50 carbon atoms, a substituted or unsubstituted cycloalkyl group having 3 to 50 ring-forming carbon atoms, a halogen atom, a cyano group, a nitro group, a substituted or unsubstituted aryl group having 6 to 30 ring-forming carbon atoms, or a substituted or unsubstituted heterocyclic group having 5 to 50 ring-forming carbon atoms, Wherein one selected from R 34 ～R 43 is a single bond bonded to j, M3 is 0 or 1, n3 is 0 or 1, When m3 is 0 and n3 is 0, h is bonded to L a3 、L b2 or L b3 , When m3 is 0 and n3 is 1, f is bonded to L a3 、L b2 or L b3 , When m3 is 1 and n3 is 0, one selected from R 10 ～R 14 is a single bond to h, Two selected from R 10 ～R 14 which are not the single bond and are adjacent, two selected from R 15 ～R 20 which are not any of the single bonds and are adjacent, and R 34 and R 35 are not bonded to each other without forming a ring structure, In the formula (d), the amino acid sequence of the formula (d), R 10 ～R 14 , f are the same as above, R 44 ～R 51 is independently a hydrogen atom, a substituted or unsubstituted alkyl group having 1 to 50 carbon atoms, a substituted or unsubstituted cycloalkyl group having 3 to 50 ring-forming carbon atoms, a halogen atom, a cyano group, a nitro group, a substituted or unsubstituted aryl group having 6 to 30 ring-forming carbon atoms, or a substituted or unsubstituted heterocyclic group having 5 to 50 ring-forming carbon atoms, X is an oxygen atom, a sulfur atom, CR a R b or NR c , R a 、R b and R c are each independently a hydrogen atom, a substituted or unsubstituted alkyl group having 1 to 50 carbon atoms, a substituted or unsubstituted aryl group having 6 to 50 ring-forming carbon atoms, or a substituted or unsubstituted heterocyclic group having 5 to 50 ring-forming carbon atoms, or R a and R b are optionally bonded to each other to form a substituted or unsubstituted ring structure, Wherein one selected from R 44 ～R 51 is a single bond bonded to k, M4 is 0 or 1 and the number of the groups, When m4 is 0, f is bonded to L a3 、L b2 or L b3 , Selected from R 44 ～R 51 is not the single bond and two adjacent ones are optionally bonded to each other independently to form a substituted or unsubstituted ring structure, In the formula (e) of the present invention, R 10 ～R 14 , f are the same as above, R 52 ～R 66 is independently a hydrogen atom, a substituted or unsubstituted alkyl group having 1 to 50 carbon atoms, a substituted or unsubstituted cycloalkyl group having 3 to 50 ring-forming carbon atoms, a halogen atom, a cyano group, a nitro group, a substituted or unsubstituted aryl group having 6 to 30 ring-forming carbon atoms, or a substituted or unsubstituted heterocyclic group having 5 to 50 ring-forming carbon atoms, Wherein one selected from R 52 ～R 56 is a single bond with l, the other selected from R 52 ～R 56 is a single bond with m, M5 is 0 or 1 and the number of the groups, When m5 is 0, f is bonded to L a3 、L b2 or L b3 , Two selected from R 10 ～R 14 which are not the single bond and are adjacent, two selected from R 52 ～R 56 which are not any of the single bonds and are adjacent, R 52 and R 61 , and R 56 and R 57 are not bonded to each other without forming a ring structure.
  3. 3. The organic electroluminescent element according to claim 2, wherein, The light-emitting layer contains a light-emitting compound that exhibits light emission with a maximum peak wavelength of 600nm to 640nm or 500nm to 550 nm.
  4. 4. The organic electroluminescent element according to claim 1, wherein, Ar a2 is a substituted or unsubstituted fluorenyl group, a substituted or unsubstituted spirobifluorenyl group, a substituted or unsubstituted phenyl group, or a substituted or unsubstituted adamantyl group.
  5. 5. The organic electroluminescent element as claimed in claim 1 or 2, wherein, Ar a3 is represented by the following formula (1 a): (1a) In the formula (1 a), the amino acid sequence of the formula (1 a), One selected from R a1 ～R a13 is a single bond to 1, R a1 ～R a13 which is not a single bond bonded to 1 is each independently a hydrogen atom, a halogen atom, a nitro group, a cyano group, a substituted or unsubstituted alkyl group having 1 to 50 carbon atoms, a substituted or unsubstituted alkenyl group having 2 to 50 carbon atoms, a substituted or unsubstituted alkynyl group having 2 to 50 carbon atoms, a substituted or unsubstituted cycloalkyl group having 3 to 50 ring-forming carbon atoms, a substituted or unsubstituted aryl group having 6 to 50 ring-forming carbon atoms, a substituted or unsubstituted aralkyl group having 7 to 50 carbon atoms, a substituted or unsubstituted heterocyclic group having 5 to 50 ring-forming carbon atoms, a substituted or unsubstituted haloalkyl group having 1 to 50 carbon atoms, a substituted or unsubstituted haloalkoxy group having 1 to 50 carbon atoms, -a group represented by Si (R 901 )(R 902 )(R 903 ), -a group represented by O- (R 904 ), or-S- (R 905 ), R 901 ～R 905 is independently a hydrogen atom, a substituted or unsubstituted alkyl group having 1 to 50 carbon atoms, a substituted or unsubstituted cycloalkyl group having 3 to 50 ring-forming carbon atoms, a substituted or unsubstituted aryl group having 6 to 50 ring-forming carbon atoms, or a substituted or unsubstituted heterocyclic group having 5 to 50 ring-forming carbon atoms, When more than 2R 901 exist, more than 2R 901 are the same or different from each other, When more than 2R 902 exist, more than 2R 902 are the same or different from each other, When more than 2R 903 exist, more than 2R 903 are the same or different from each other, When more than 2R 904 exist, more than 2R 904 are the same or different from each other, When more than 2R 905 exist, more than 2R 905 are the same or different from each other, R a14 is a hydrogen atom, a substituted or unsubstituted phenyl group, a substituted or unsubstituted biphenyl group, or a substituted or unsubstituted naphthyl group, Wherein adjacent two selected from R a1 ～R a13 and R a14 , which are not single bonds with x 1, are optionally bonded to each other to form a substituted or unsubstituted benzene ring or are not bonded to each other to form a ring.
  6. 6. The organic electroluminescent element according to claim 5, wherein, In formula (1 a), one selected from R a1 ～R a13 is a single bond to x 1, R a1 ～R a13 which is not a single bond to 1 is a hydrogen atom, R a14 is a hydrogen atom, or a substituted or unsubstituted phenyl group, Wherein R a1 ～R a13 and R a14 , which are not single bonds to 1, are each not bonded to each other without forming a ring.
  7. 7. The organic electroluminescent element according to claim 2, wherein, In formula (B2), ar b1 is a substituted or unsubstituted dibenzofuranyl group, or a substituted or unsubstituted naphthobenzofuranyl group.
  8. 8. The organic electroluminescent element according to claim 1, wherein, Any one of Ar b2 and Ar b3 is a group represented by the formula (d), Each of R 1 ～R 4 is not bonded to each other without forming a ring.
  9. 9. The organic electroluminescent element as claimed in claim 1 or 2, wherein, L b2 is a single bond, and the total number of the components is a single bond, Ar b2 is a group represented by the formula (d), In formula (d), m4 is 0 and X is an oxygen atom.
  10. 10. The organic electroluminescent element according to claim 1, wherein, In formula (A2), R 1 is bonded to 2, Each of R 1 ～R 8 is not bonded to each other without forming a ring.
  11. 11. The organic electroluminescent element according to claim 1, wherein, In formula (A2), R 8 is bonded to 2, Adjacent two selected from R 1 ～R 4 are bonded to each other to form a substituted or unsubstituted benzene ring.
  12. 12. The organic electroluminescent element as claimed in claim 1 or 2, wherein, L a1 、L a2 、L a3 、L b1 、L b2 and L b3 are each independently a single bond, or a substituted or unsubstituted phenylene group.
  13. 13. The organic electroluminescent element according to claim 1, wherein, The hole transport layer comprises at least one of the following compounds: 、 、 、 、 、 、 、 、 And 。
  14. 14. The organic electroluminescent element according to claim 2, wherein, The hole transport layer comprises at least one of the following compounds: 、 、 、 And 。
  15. 15. The organic electroluminescent element as claimed in claim 1 or 2, wherein, The hole transport layer comprises at least one of the following compounds: And 。
  16. 16. The organic electroluminescent element according to claim 1, wherein, The light-emitting auxiliary layer comprises at least one of the following compounds: 、 、 、 、 、 、 、 And 。
  17. 17. The organic electroluminescent element according to claim 2, wherein, The light-emitting auxiliary layer comprises at least one of the following compounds: 、 、 、 、 、 、 、 、 And 。
  18. 18. The organic electroluminescent element as claimed in claim 1 or 2, wherein, The light-emitting auxiliary layer comprises at least one of the following compounds: And 。
  19. 19. An organic electroluminescent element comprising a first electrode, a second electrode, and two or more light emitting units disposed between the first electrode and the second electrode, wherein, The more than two light emitting units comprise at least a first light emitting unit and a second light emitting unit, The first light emitting unit and the second light emitting unit are sequentially arranged from the first electrode side to the second electrode side, The first light emitting unit includes a first light emitting strip including a first organic layer, The first organic layer includes: A first light emitting layer; a first hole transport layer formed between the first light emitting layer and the first electrode, and A first light-emitting auxiliary layer formed between the first hole transport layer and the first light-emitting layer, The second light emitting unit includes a second light emitting strip including a second organic layer, The second organic layer includes: A second hole transport layer; a second light-emitting layer formed between the second hole transport layer and the second electrode, and A second light-emitting auxiliary layer formed between the second hole transport layer and the second light-emitting layer, At least one of the first light-emitting layer and the second light-emitting layer contains a light-emitting compound exhibiting light emission with a maximum peak wavelength of 600nm to 640nm or 500nm to 550nm, At least one of the first hole transport layer and the second hole transport layer contains a compound represented by the following formula (A1), At least one of the first light-emitting auxiliary layer and the second light-emitting auxiliary layer contains a compound represented by the following formula (A2), (A1) (A2) The definition of each substituent in the formula (A1) and the formula (A2) is the same as that in claim 1.
  20. 20. An organic electroluminescent element comprising a first electrode, a second electrode, and two or more light emitting units disposed between the first electrode and the second electrode, wherein, The more than two light emitting units comprise at least a first light emitting unit and a second light emitting unit, The first light emitting unit and the second light emitting unit are sequentially arranged from the first electrode side to the second electrode side, The first light emitting unit includes a first light emitting strip including a first organic layer, The first organic layer includes: A first light emitting layer; a first hole transport layer formed between the first light emitting layer and the first electrode, and A plurality of first light-emitting auxiliary layers formed between the first hole transport layer and the first light-emitting layer, The plurality of first light-emitting auxiliary layers includes a1 st a light-emitting auxiliary layer adjacent to the first hole transport layer and a1 st b light-emitting auxiliary layer adjacent to the first light-emitting layer, The second light emitting unit includes a second light emitting strip including a second organic layer, The second organic layer includes: A second hole transport layer; a second light-emitting layer formed between the second hole transport layer and the second electrode, and A plurality of second light-emitting auxiliary layers formed between the second hole transport layer and the second light-emitting layer, The plurality of second light-emitting auxiliary layers includes a2 a-th light-emitting auxiliary layer adjacent to the second hole transport layer and a2 b-th light-emitting auxiliary layer adjacent to the second light-emitting layer, At least one of the first hole transport layer and the second hole transport layer contains a compound represented by the following formula (B1) or a diamine, At least one of the 1 st and 2 nd light-emitting auxiliary layers comprises a compound represented by the following formula (B2), (B1) (B2) The definition of each substituent in the formula (B1) and the formula (B2) is the same as that in claim 2.

Description

Organic electroluminescent element and electronic device including the same Technical Field The present invention relates to an organic electroluminescent element and an electronic device including the same. Background In general, an organic electroluminescent element (hereinafter, sometimes referred to as an "organic EL element") is composed of an anode, a cathode, and an organic layer sandwiched between the anode and the cathode. When a voltage is applied between the two electrodes, electrons are injected from the cathode side to the light emitting region, and holes are injected from the anode side to the light emitting region. The injected electrons and holes recombine in the light-emitting region to form an excited state, and when the excited state returns to the ground state, light is emitted. Therefore, finding a material combination capable of efficiently transporting electrons or holes to a light emitting region, making it easy for the electrons and holes to recombine and efficiently causing excitons to emit light is important for obtaining a high-performance organic EL element. Patent documents 1 to 10 disclose organic electroluminescent elements and compounds used as materials thereof. Prior art literature Patent document 1 U.S. patent No. 11230521 (US 11230521B 2) Patent document 2 pct patent publication No. 2019/044542 (WO 2019/044542 A1) Patent document 3 U.S. patent publication No. 2020/0144552 (U.S. patent publication No. 2020/0144552A 1) Patent document 4 Korean patent application No. 2355848 (KR 10-2355848B 1) Patent document 5 pct patent publication No. 2012/034627 (WO 2012/034627 A1) Patent document 6 PCT patent publication No. 2020/226298 (WO 2020/226298A 1) Patent document 7 PCT patent publication No. WO2016/006710 (WO 2016/006710A 1) Patent document 8 U.S. patent publication No. 2017/0288147 (US 2017/0288147A 1) Patent document 9 PCT patent publication No. 2023/140629 (WO 2023/140629A 1) Patent document 10 European patent publication No. 3540803 (EP 3540803A 2) Disclosure of Invention Problems to be solved by the invention In the past, although many compounds for organic EL elements have been reported, there is still a need for further improvement in the performance of organic EL elements. In order to solve the above-described problems, an object of the present invention is to provide an organic EL element having further improved element performance by including a combination of specific compounds, and an electronic device including such an organic EL element. Means for solving the problems According to an embodiment of the present invention, there is provided an organic electroluminescent element including a first electrode, a second electrode, and an organic layer formed between the first electrode and the second electrode, the organic layer including a light-emitting layer, a hole-transporting layer formed between the light-emitting layer and the first electrode, and a light-emitting auxiliary layer formed between the hole-transporting layer and the light-emitting layer, the light-emitting layer including a light-emitting compound exhibiting light emission with a maximum peak wavelength of 600nm to 640nm or 500nm to 550nm, the hole-transporting layer including a compound represented by the following formula (A1), the light-emitting auxiliary layer including a compound represented by the following formula (A2). (A1) (A2) (In the formula (A1), N is a central nitrogen atom. L a1、La2 and L a3 are each independently a single bond, a substituted or unsubstituted arylene group having 6 to 18 ring-forming carbon atoms, or a substituted or unsubstituted divalent heterocyclic group having 5 to 30 ring-forming carbon atoms. Ar a2 is a substituted or unsubstituted aryl group having 6 to 30 ring-forming carbon atoms, a substituted or unsubstituted heterocyclic group having 5 to 30 ring-forming carbon atoms, or a substituted or unsubstituted cycloalkyl group having 5 to 30 ring-forming carbon atoms. In the formula (A2) of the present invention, N is a central nitrogen atom. X b represents an oxygen atom or a sulfur atom. One selected from R 1～R8 is a single bond to x 2. Two adjacent substituents selected from R 1～R8 are capable of bonding to each other to form a substituted or unsubstituted benzene ring or are not bonded to each other to form a ring. R 1～R8 which is not a single bond to x 2 and two adjacent R 1～R8 are not bonded to each other is a hydrogen atom. L b1、Lb2 and L b3 are each independently a single bond, a substituted or unsubstituted arylene group having 6 to 18 ring-forming carbon atoms, or a substituted or unsubstituted divalent heterocyclic group having 5 to 30 ring-forming carbon atoms. Ar a3 in the formula (A1) and Ar b2 and Ar b3 in the formula (A2) are each independently a group represented by any one of the following formulas (a) to (e). (In the formula (a), R 10～R25 is independently a hydrogen atom, a substituted or unsubstituted alkyl group having 1 to 50 carbon atoms, a s