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EP-4203647-B1 - LIGHT-EMITTING DEVICE AND ELECTRONIC APPARATUS INCLUDING THE SAME

EP4203647B1EP 4203647 B1EP4203647 B1EP 4203647B1EP-4203647-B1

Inventors

  • LEE, YOONKYOO
  • SUN, JINWON
  • Chu, Changwoong

Dates

Publication Date
20260506
Application Date
20221223

Claims (18)

  1. A light-emitting device (10) comprising: a first electrode (110); a second electrode (150) facing the first electrode (110); and an interlayer (130) between the first electrode (110) and the second electrode (150) and comprising an emission layer, wherein, the emission layer comprises a first emission layer and a second emission layer, the first emission layer comprises a first host (T H1 ) comprising a first-first host and a first-second host, but does not comprise a dopant, the second emission layer comprises a second host (T H2 ) and a dopant, the second host (T H2 ) comprising a second-first host and a second-second host, the first-first host and the first-second host are different from each other, the second-first host and the second-second host are different from each other, and a triplet energy level (eV) of the first host (T H1 ) is greater than a triplet energy level (eV) of the second host (T H2 ), wherein the triplet energy level of the first host T H1 refers to the triplet energy level of a host mixture including both the first-first host and the first-second host and the triplet energy level of the first host T H1 is calculated from the starting point of the shortest wavelength from a low-temperature emission spectrum of a mixed deposition layer formed by the first-first host and the first-second host; wherein the triplet energy level of the second host T H2 refers to the triplet energy level of a host mixture including both the second-first host and the second-second host and the triplet energy level of the second host T H2 is calculated from the starting point of the shortest wavelength from a low-temperature emission spectrum of a mixed deposition layer formed by the second-first host and the second-second host, wherein the thickness of the first emission layer is smaller than the thickness of the second emission layer, the thickness of the first emission layer is in a range of 50 Å to 150 Å, and the thickness of the second emission layer is in a range of 150 Å to 450 Å.
  2. The light-emitting device (10) of claim 1, wherein Condition 1 or Condition 2 is satisfied: Condition 1 the first emission layer is between the first electrode (110) and the second emission layer, and the second emission layer is between the first emission layer and the second electrode (150); and Condition 2 the first emission layer is between the second electrode (150) and the second emission layer, and the second emission layer is between the first emission layer and the first electrode (110).
  3. The light-emitting device (10) of at least one of claims 1 or 2, wherein. the interlayer (130) further comprises a hole transport region between the first electrode (110) and the emission layer and an electron transport region between the emission layer and the second electrode (150), the hole transport region comprises a hole injection layer, a hole transport layer, an emission auxiliary layer, an electron blocking layer, or any combination thereof, and the electron transport region comprises a buffer layer (210), a hole blocking layer, an electron control layer, an electron transport layer, an electron injection layer, or any combination thereof.
  4. The light-emitting device (10) of at least one of claims 2 or 3, wherein Condition 1-1 or Condition 2-1 is satisfied: Condition 1-1 the first emission layer is between a hole transport region and the second emission layer, and the second emission layer is between an electron transport region and the first emission layer; and Condition 2-1 the first emission layer is between the electron transport region and the second emission layer, and the second emission layer is between the hole transport region and the first emission layer.
  5. The light-emitting device (10) of at least one of claims 1 to 4, wherein the emission layer is configured to emit blue light.
  6. The light-emitting device (10) of claim 5, wherein the blue light has a maximum emission wavelength in a range of 400 nm to 490 nm.
  7. The light-emitting device (10) of at least one of claims 1 to 6, wherein the first emission layer is in direct contact with the second emission layer.
  8. The light-emitting device (10) of at least one of claims 1 to 7, wherein triplet excitons formed in the first emission layer are configured to migrate from the first emission layer to the second emission layer.
  9. The light-emitting device (10) of at least one of claims 1 to 8, wherein the first-first host, the first-second host, the second-first host, and the second-second host are each independently represented by Formula 1: Formula 1 [Ar 11 ] c11 -[(L 11 ) a11 -R 11 ]b 11 wherein, in Formula 1, Ar 11 and L 11 are each independently a C 3 -C 60 carbocyclic group unsubstituted or substituted with at least one R 10a or a C 1 -C 60 heterocyclic group unsubstituted or substituted with at least one R 10a , a11 and c11 are each an integer from 0 to 3, R 11 is hydrogen, deuterium, -F, -Cl, -Br, -I, a hydroxyl group, a cyano group, a nitro group, a C 1 -C 60 alkyl group unsubstituted or substituted with at least one R 10a , a C 2 -C 60 alkenyl group unsubstituted or substituted with at least one R 10a , a C 2 -C 60 alkynyl group unsubstituted or substituted with at least one R 10a , a C 1 -C 60 alkoxy group unsubstituted or substituted with at least one R 10a , a C 3 -C 60 carbocyclic group unsubstituted or substituted with at least one R 10a , a C 1 -C 60 heterocyclic group unsubstituted or substituted with at least one R 10a , a C 6 -C 60 aryloxy group unsubstituted or substituted with at least one R 10a , a C 6 -C 60 arylthio group unsubstituted or substituted with at least one R 10a , a C 7 -C 60 arylalkyl group unsubstituted or substituted with at least one R 10a , a C 2 -C 60 heteroarylalkyl group unsubstituted or substituted with at least one R 10a , -Si(Q 1 )(Q 2 )(Q 3 ), -N(Q 1 )(Q 2 ), - B(Q 1 )(Q 2 ), -C(=O)(Q 1 ), -S(=O) 2 (Q 1 ), or -P(=O)(Q 1 )(Q 2 ), b11 is an integer from 1 to 5, R 10a is: deuterium, -F, -Cl, -Br, -I, a hydroxyl group, a cyano group, or a nitro group; a C 1 -C 60 alkyl group, a C 2 -C 60 alkenyl group, a C 2 -C 60 alkynyl group, or a C 1 -C 60 alkoxy group, each unsubstituted or substituted with deuterium, -F, -Cl, -Br, -I, a hydroxyl group, a cyano group, a nitro group, a C 3 -C 60 carbocyclic group, a C 1 -C 60 heterocyclic group, a C 6 -C 60 aryloxy group, a C 6 -C 60 arylthio group, a C 7 -C 60 arylalkyl group, a C 2 -C 60 heteroarylalkyl group, -Si(Q 11 )(Q 12 )(Q 13 ), -N(Q 11 )(Q 12 ), -B(Q 11 )(Q 12 ), - C(=O)(Q 11 ), -S(=O) 2 (Q 11 ), -P(=O)(Q 11 )(Q 12 ), or any combination thereof; a C 3 -C 60 carbocyclic group, a C 1 -C 60 heterocyclic group, a C 6 -C 60 aryloxy group, a C 6 -C 60 arylthio group, a C 7 -C 60 arylalkyl group, or a C 2 -C 60 heteroarylalkyl group, each unsubstituted or substituted with deuterium, -F, -Cl, -Br, -I, a hydroxyl group, a cyano group, a nitro group, a C 1 -C 60 alkyl group, a C 2 -C 60 alkenyl group, a C 2 -C 60 alkynyl group, a C 1 -C 60 alkoxy group, a C 3 -C 60 carbocyclic group, a C 1 -C 60 heterocyclic group, a C 6 -C 60 aryloxy group, a C 6 -C 60 arylthio group, a C 7 -C 60 arylalkyl group, a C 2 -C 60 heteroarylalkyl group, -Si(Q 21 )(Q 22 )(Q 23 ), -N(Q 21 )(Q 22 ), -B(Q 21 )(Q 22 ), -C(=O)(Q 21 ), - S(=O) 2 (Q 21 ), -P(=O)(Q 21 )(Q 22 ), or any combination thereof; or -Si(Q 31 )(Q 32 )(Q 33 ), -N(Q 31 )(Q 32 ), -B(Q 31 )(Q 32 ), -C(=O)(Q 31 ), -S(=O) 2 (Q 31 ), or - P(=O)(Q 31 )(Q 32 ), and Q 1 to Q 3 , Q 11 to Q 13 , Q 21 to Q 23 , and Q 31 to Q 33 are each independently: hydrogen; deuterium; -F; -Cl; -Br; -I; a hydroxyl group; a cyano group; a nitro group; a C 1 -C 60 alkyl group; a C 2 -C 60 alkenyl group; a C 2 -C 60 alkynyl group; a C 1 -C 60 alkoxy group; a C 3 -C 60 carbocyclic group or a C 1 -C 60 heterocyclic group, each unsubstituted or substituted with deuterium, -F, a cyano group, a C 1 -C 60 alkyl group, a C 1 -C 60 alkoxy group, a phenyl group, a biphenyl group, or any combination thereof; a C 7 -C 60 arylalkyl group; or a C 2 -C 60 heteroarylalkyl group.
  10. The light-emitting device (10) of at least one of claims 1 to 9, wherein an electron-transporting moiety is comprised in: one selected from the first-first host and the first-second host; and one selected from the second-first host and the second-second host.
  11. The light-emitting device (10) of claim 10, wherein the electron-transporting moiety comprises a cyano group, a fluorine, a π-electron-deficient nitrogen-containing cyclic group, or any combination thereof.
  12. The light-emitting device (10) of at least one of claims 1 to 11, wherein, the first-first host and the second-first host are each a hole-transporting host, and the first-second host and the second-second host are each an electron-transport host.
  13. The light-emitting device (10) of at least one of claims 1 to 12, wherein the dopant is a phosphorescent dopant.
  14. The light-emitting device (10) of at least one of claims 1 to 13, wherein the dopant is represented by Formula 3: Formula 3 M 3 (L 31 ) a31 (L 32 ) a32 wherein, in Formulae 3 and 3a, M 3 is iridium (Ir), platinum (Pt), palladium (Pd), osmium (Os), titanium (Ti), gold (Au), hafnium (Hf), europium (Eu), terbium (Tb), rhodium (Rh), rhenium (Re), or thulium (Tm), L 31 is a ligand represented by Formula 3a, a31 is an integer from 1 to 3, wherein, when a31 is an integer from 2 or more, two or more of L 31 are identical to or different from each other, L 32 is an organic ligand, a32 is an integer from 1 to 3, wherein, when a32 is an integer from 2 or more, two or more of L 32 are identical to or different from each other, when a31 is 2 or more, among two or more of L 31 , two CY31 rings are optionally linked together via T 32 which is a linking group and two CY32 rings are optionally linked together via T 33 which is a linking group, X 31 and X 32 are each independently nitrogen or carbon, ring CY 31 and ring CY 32 are each independently a C 3 -C 60 carbocyclic group or a C 1 -C 60 heterocyclic group, T 31 to T 33 are each independently a single bond, *"-O-*‴, *"-S-*‴, *"-C(=O)-*‴, *"N(Z 31 )-*‴ *"C(Z 31 )(Z 32 )-*‴, *"-C(Z 31 )=C(Z 31 )-*‴, *"-C(Z 31 )*‴, or *"=C=*‴, *" and *‴ each indicate a binding site to a neighboring atom, X 33 and X 34 are each independently a covalent bond, a coordinate bond, O, S, N(Z 33 ), B(Z 33 ), P(Z 33 ), C(Z 33 )(Z 34 ), or Si(Z 33 )(Z 34 ), R 31 , R 32 , and Z 31 to Z 34 are each independently hydrogen, deuterium, -F, -CI, - Br, -I, a hydroxyl group, a cyano group, a nitro group, a C 1 -C 20 alkyl group unsubstituted or substituted with at least one R 10a , a C 1 -C 20 alkoxy group unsubstituted or substituted with at least one R 10a , a C 3 -C 60 carbocyclic group unsubstituted or substituted with at least one R 10a , a C 1 -C 60 heterocyclic group unsubstituted or substituted with at least one R 10a , -Si(Q 1 )(Q 2 )(Q 3 ), -N(Q 1 )(Q 2 ), -B(Q 1 )(Q 2 ), -C(=O)(Q 1 ), - S(=O) 2 (Q 1 ), or -P(=O)(Q 1 )(Q 2 ), b31 and b32 are each independently an integer from 0 to 10, when b31 is an integer of 2 or more, two R 31 (s) among two or more of R 31 (s); two R 32 (s) among two or more of R 32 (s); or R 31 and R 32 , are optionally linked to each other to form a C 3 -C 60 carbocyclic group unsubstituted or substituted with at least one R 10a or a C 1 -C 60 heterocyclic group unsubstituted or substituted with at least one R 10a , * and *' in Formula 3a each indicate a binding site to M 3 in Formula 3, R 10a is: deuterium, -F, -Cl, -Br, -I, a hydroxyl group, a cyano group, or a nitro group; a C 1 -C 60 alkyl group, a C 2 -C 60 alkenyl group, a C 2 -C 60 alkynyl group, or a C 1 -C 60 alkoxy group, each unsubstituted or substituted with deuterium, -F, -Cl, -Br, -I, a hydroxyl group, a cyano group, a nitro group, a C 3 -C 60 carbocyclic group, a C 1 -C 60 heterocyclic group, a C 6 -C 60 aryloxy group, a C 6 -C 60 arylthio group, a C 7 -C 60 arylalkyl group, a C 2 -C 60 heteroarylalkyl group, -Si(Q 11 )(Q 12 )(Q 13 ), -N(Q 11 )(Q 12 ), -B(Q 11 )(Q 12 ), - C(=O)(Q 11 ), -S(=O) 2 (Q 11 ), -P(=O)(Q 11 )(Q 12 ), or any combination thereof; a C 3 -C 60 carbocyclic group, a C 1 -C 60 heterocyclic group, a C 6 -C 60 aryloxy group, a C 6 -C 60 arylthio group, a C 7 -C 60 arylalkyl group, or a C 2 -C 60 heteroarylalkyl group, each unsubstituted or substituted with deuterium, -F, -Cl, -Br, -I, a hydroxyl group, a cyano group, a nitro group, a C 1 -C 60 alkyl group, a C 2 -C 60 alkenyl group, a C 2 -C 60 alkynyl group, a C 1 -C 60 alkoxy group, a C 3 -C 60 carbocyclic group, a C 1 -C 60 heterocyclic group, a C 6 -C 60 aryloxy group, a C 6 -C 60 arylthio group, a C 7 -C 60 arylalkyl group, a C 2 -C 60 heteroarylalkyl group, -Si(Q 21 )(Q 22 )(Q 23 ), -N(Q 21 )(Q 22 ), -B(Q 21 )(Q 22 ), -C(=O)(Q 21 ), - S(=O) 2 (Q 21 ), -P(=O)(Q 21 )(Q 22 ), or any combination thereof; or -Si(Q 31 )(Q 32 )(Q 33 ), -N(Q 31 )(Q 32 ), -B(Q 31 )(Q 32 ), -C(=O)(Q 31 ), -S(=O) 2 (Q 31 ), or - P(=O)(Q 31 )(Q 32 ), and Q 1 to Q 3 , Q 11 to Q 13 , Q 21 to Q 23 , and Q 31 to Q 33 are each independently: hydrogen; deuterium; -F; -Cl; -Br; -I; a hydroxyl group; a cyano group; a nitro group; a C 1 -C 60 alkyl group; a C 2 -C 60 alkenyl group; a C 2 -C 60 alkynyl group; a C 1 -C 60 alkoxy group; a C 3 -C 60 carbocyclic group or a C 1 -C 60 heterocyclic group, each unsubstituted or substituted with deuterium, -F, a cyano group, a C 1 -C 60 alkyl group, a C 1 -C 60 alkoxy group, a phenyl group, a biphenyl group, or any combination thereof; a C 7 -C 60 arylalkyl group; or a C 2 -C 60 heteroarylalkyl group.
  15. The light-emitting device (10) of claim 14, wherein, in Formula 3, M 3 is iridium(Ir) or platinum(Pt).
  16. An electronic apparatus comprising the light-emitting device (10) of at least one of claims 1 to 15.
  17. The electronic apparatus of claim 16, further comprising a thin-film transistor (TFT), wherein, the thin-film transistor (TFT) comprises a source electrode (260) and a drain electrode (270), and the first electrode (110) of the light-emitting device (10) is electrically connected to either the source electrode (260) of the thin-film transistor (TFT) or the drain electrode (270) of the thin-film transistor (TFT).
  18. The electronic apparatus of at least one of claims 16 or 17, further comprising a color filter, a quantum dot, a color conversion layer, a touch screen layer, a polarizing layer, or any combination thereof.

Description

BACKGROUND 1. Field Aspects of one or more embodiments of the present disclosure relate to a light-emitting device and an electronic apparatus including the same. The preamble of the device in question comprises a light-emitting device comprising a first electrode, a second electrode facing the first electrode, and an interlayer between the first electrode and the second electrode and comprising an emission layer. 2. Description of the Related Art Self-emissive devices among light-emitting devices have wide viewing angles, high contrast ratios, short response times, and excellent or suitable characteristics in terms of luminance, driving voltage, and response speed. In a light-emitting device, a first electrode is on a substrate, and a hole transport region, an emission layer, an electron transport region, and a second electrode are sequentially disposed on the first electrode. Holes provided from the first electrode move toward the emission layer through the hole transport region, and electrons provided from the second electrode move toward the emission layer through the electron transport region. Carriers, such as holes and electrons, recombine in the emission layer to produce excitons. These excitons are transitioned from an excited state to a ground state to thereby generate light. WO 2020/183264 A1 discloses OLEDs comprising two light emitting layers and comprising one host compound and one guest compound each. The compounds have defined energetic values. US 2015/280158 A1 discloses OLEDs comprising two light emitting layers. The first light emitting layer comprises one host compound and one dopant and the second light emitting layer comprises two host compounds and one dopant. The compounds have defined energetic values. SUMMARY Aspects of one or more embodiments of the present disclosure are directed toward a light-emitting device and an electronic apparatus including the same. Additional aspects of embodiments of the present disclosure will be set forth in part in the disclosure which follows and, in part, will be apparent from the disclosure, or may be learned by practice of the presented embodiments of the disclosure. According to one or more embodiments, a light-emitting device includes a first electrode,a second electrode facing the first electrode, andan interlayer arranged between the first electrode and the second electrode and including an emission layer,wherein the emission layer includes a first emission layer and a second emission layer,the first emission layer includes a first host including a first-first host and a first-second host, but does not include a dopant (e.g., the dopant of the second emission layer or any dopant),the second emission layer includes a second host and a dopant, the second host including a second-first host and a second-second host,the first-first host and the first-second host are different from each other,the second-first host and the second-second host are different from each other, anda triplet energy level of the first host (TH1) is greater than a triplet energy level of the second host (TH2). The thickness of the first emission layer is smaller than the thickness of the second emission layer, the thickness of the first emission layer is in a range of 50 A to 150 Å, and the thickness of the second emission layer is in a range of 150 Å to 450 Å. The triplet energies are measured as defined later in the description. According to one or more embodiments, an electronic apparatus includes the light-emitting device. BRIEF DESCRIPTION OF THE DRAWINGS The above and other aspects and features of certain embodiments of the disclosure will be more apparent from the following description taken in conjunction with the accompanying drawings, in which: FIG. 1 shows a schematic view of a light-emitting device according to an embodiment;FIG. 2 shows a cross-sectional view of an electronic apparatus according to an embodiment; andFIG. 3 shows a cross-sectional view of an electronic apparatus according to another embodiment. DETAILED DESCRIPTION Reference will now be made in more detail to embodiments, examples of which are illustrated in the accompanying drawings, wherein like reference numerals refer to like elements throughout, and duplicative descriptions thereof may not be provided. In this regard, the present embodiments may have different forms and should not be construed as being limited to the descriptions set forth herein. Accordingly, the embodiments are merely described, by referring to the drawings, to explain aspects of embodiments of the present disclosure. As utilized herein, the term "and/or" includes any and all combinations of one or more of the associated listed items. Throughout the disclosure, the expression "at least one of a, b and c" indicates only a, only b, only c, both (e.g., simultaneously) a and b, both (e.g., simultaneously) a and c, both (e.g., simultaneously) b and c, all of a, b, and c, or variations thereof. A light emitting device as per cla