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US-12628552-B2 - Light-emitting device and electronic apparatus including the light-emitting device

US12628552B2US 12628552 B2US12628552 B2US 12628552B2US-12628552-B2

Abstract

A light-emitting device and an electronic apparatus including the same are provided. The light-emitting device includes a first electrode, a second electrode facing the first electrode, and an interlayer between the first electrode and the second electrode. The interlayer includes an emission layer, and a hole transport region between the emission layer and the first electrode. The hole transport region includes at least one first compound including 15 N in the number of m 1 , 15 N in the number of m 1 is linked to a neighboring carbon (C) via a single bond, m 1 is an integer equal to or greater than 1, and the first compound is not Compound A in the specification.

Inventors

  • Beomjin Kim
  • Yeongji IM
  • Jino Lim
  • Seunggak Yang

Assignees

  • SAMSUNG DISPLAY CO., LTD.

Dates

Publication Date
20260512
Application Date
20210625
Priority Date
20200626

Claims (14)

  1. 1 . 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, wherein the interlayer includes an emission layer, and a hole transport region between the emission layer and the first electrode, the hole transport region includes a first layer, and a second layer between the first layer and the emission layer, the first layer and the second layer each include at least one first compound, the at least one first compound included in the first layer is different from the at least one first compound included in the second layer, and the at least one first compound is each independently represented by one of Formulae 1, 1-1, 2, 2-1, and 3: wherein in Formulae 1, 1-1, 2, 2-1, and 3, Y 21 is O, S, Se, C(Z 21a )(Z 21b ), Si(Z 21a )(Z 21b ), or N*(Z 21a ), Y 31 is O, S, Se, C(Z 31a )(Z 31b ), Si(Z 31a )(Z 31b ), or N*(Z 31a ), Y 32 is O, S, Se, C(Z 32a )(Z 32b ), Si(Z 32a )(Z 32b ), or N*(Z 32a ), N* is 14 N or 15 N, at least one N* in Formula 1, 1-1, 2, 2-1, or 3 is 15N, b21, b31, and b32 are each independently an integer from 0 to 3, Ar 11 to Ar 14 , Ar 21 , Ar 22 , and Ar 24 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 , ring A 21 , A 22 , and A 31 to A 34 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 , L 10 , L 20 , and L 30 are each independently *—O—*′, *—S—*′, *—N*(Ar 15 )—*′, 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 , Ar 15 is the same as described in connection with Ar 11 , L 11 to L 14 and L 21 to L 24 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 to a14 and a21 to a24 are each independently an integer from 0 to 10, a10, a20, and a30 are each independently an integer from 1 to 5, R 21 , R 22 , R 31 to R 34 , Z 21a , Z 21b , Z 31a , Z 31b , Z 32a , and Z 32b 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 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 , —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 ), c21, c22, and c31 to c34 are each independently an integer from 0 to 10, n is an integer from 1 to 5, R 10a is: deuterium (-D), —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, —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 a combination thereof; a C 3 -C 60 carbocyclic group, a C 1 -C 60 heterocyclic group, a C 6 -C 60 aryloxy group, or a C 6 -C 60 arylthio 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 -Coo aryloxy group, a C 6 -C 60 arylthio 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 a 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 ), 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; or a C 3 -C 60 carbocyclic group or a C 1 -C 6 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 a combination thereof, when a heteroatom included in the C 1 -C 60 heterocyclic group is a nitrogen atom, the nitrogen atom is 14 N or 15 N, a nitrogen atom included in the cyano group or the nitro group is 14 N or 15 N, the at least one first compound included in the first layer includes 15 N in the number of m 11 , the at least one first compound included in the second layer includes 15 N in the number of m 12 , m 11 is greater than m 12 , and the at least one first compound is not Compound A:
  2. 2 . The light-emitting device of claim 1 , wherein the at least one first compound includes two or more N(s), and when two N(s) from among the two or more N(s) are linked to a heteroatom-free group, at least one of the two N(s) is 15 N.
  3. 3 . The light-emitting device of claim 1 , wherein each N included in the at least one first compound is 15 N.
  4. 4 . The light-emitting device of claim 1 , wherein the hole transport region includes at least one of a first compound selected from Compounds 1 to 24:
  5. 5 . The light-emitting device of claim 1 , wherein the emission layer includes a first emission layer, a second emission layer, and a third emission layer each having different emission colors, the hole transport region includes a first emission auxiliary layer between the first electrode and the first emission layer, a second emission auxiliary layer between the first electrode and the second emission layer, and a third emission auxiliary layer between the first electrode and the third emission layer, and at least one of the first emission auxiliary layer, the second emission auxiliary layer, and the third emission auxiliary layer includes the at least one first compound.
  6. 6 . An electronic apparatus including the light-emitting device of claim 1 , wherein, the electronic apparatus further comprises a thin-film transistor, the thin-film transistor includes a source electrode and a drain electrode, and the first electrode of the light-emitting device is electrically connected to the source electrode or the drain electrode.
  7. 7 . The electronic apparatus of claim 6 , further comprising a color filter, a color conversion layer, a touch screen layer, a polarization layer, or a combination thereof.
  8. 8 . A light-emitting device comprising: a first electrode; a second electrode facing the first electrode; an interlayer between the first electrode and the second electrode; and a capping layer disposed outside the second electrode and having a refractive index of equal to or greater than about 1.6, wherein the interlayer includes an emission layer, and a hole transport region between the emission layer and the first electrode, the hole transport region includes a first layer, and a second layer between the first layer and the emission layer, the first layer and the second layer each include at least one first compound, the at least one first compound included in the first layer is different from the at least one first compound included in the second layer, and the at least one first compound is each independently represented by one of Formulae 1, 1-1, 2, 2-1, and 3: wherein in Formulae 1, 1-1, 2, 2-1, and 3, Y 21 is O, S, Se, C(Z 21a )(Z 21b ), Si(Z 21a )(Z 21b ), or N*(Z 21a ), Y 31 is O, S, Se, C(Z 31a )(Z 31b ), Si(Z 31a )(Z 31b ), or N*(Z 31a ), Y 32 is O, S, Se, C(Z 32a )(Z 32b ), Si(Z 32a )(Z 32b ), or N*(Z 32a ), N* is 14 N or 15 N, at least one N* in Formula 1, 1-1, 2, 2-1, or 3 is 15N, b21, b31, and b32 are each independently an integer from 0 to 3, Ar 11 to Ar 14 , Ar 21 , Ar 22 , and Ar 24 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 , ring A 21 , A 22 , and A 31 to A 34 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 , L 10 , L 20 , and L 30 are each independently *—O—*′, *—S—*′, *—N*(Ar 15 )—*′, 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 , Ar 15 is the same as described in connection with Ar 11 , L 11 to L 14 and L 21 to L 24 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 to a14 and a21 to a24 are each independently an integer from 0 to 10, a10, a20, and a30 are each independently an integer from 1 to 5, R 21 , R 22 , R 31 to R 34 , Z 21a , Z 21b , Z 31a , Z 31b , Z 32a , and Z 32b 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 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 , —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 ), c21, c22, and c31 to c34 are each independently an integer from 0 to 10, n is an integer from 1 to 5, R 10a is: deuterium (-D), —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, —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 a combination thereof; a C 3 -C 60 carbocyclic group, a C 1 -C 60 heterocyclic group, a C 6 -C 60 aryloxy group, or a C 6 -C 60 arylthio 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, —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 a 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 ), 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; or 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 a combination thereof, when a heteroatom included in the C 1 -C 60 heterocyclic group is a nitrogen atom, the nitrogen atom is 14 N or 15 N, a nitrogen atom included in the cyano group or the nitro group is 14 N or 15 N, the at least one first compound included in the first layer includes 15 N in the number of m 11 , the at least one first compound included in the second layer includes 15 N in the number of m 12 , m 11 is greater than m 12 , and the at least one first compound is not Compound A:
  9. 9 . 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, wherein the interlayer includes an emission layer, and a hole transport region between the emission layer and the first electrode, the hole transport region includes at least one first compound, each independently represented by one of Formulae 1, 1-1, 2, 2-1, and 3, and the hole transport region does not include any compound that has the same structure as the first compound except that each N* is 14 N: wherein in Formulae 1, 1-1, 2, 2-1, and 3, Y 21 is O, S, Se, C(Z 21a )(Z 21b ), Si(Z 21a )(Z 21b ), or N*(Z 21a ), Y 31 is O, S, Se, C(Z 31a )(Z 31b ), Si(Z 31a )(Z 31b ), or N*(Z 31a ), Y 32 is O, S, Se, C(Z 32a )(Z 32b ), Si(Z 32a )(Z 32b ), or N*(Z 32a ), N* is 14 N or 15 N, at least one N* in Formula 1, 1-1, 2, 2-1, or 3 is 15 N, b21, b31, and b32 are each independently an integer from 0 to 3, Ar 11 to Ar 14 , Ar 21 , Ar 22 , and Ar 24 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 , ring A 21 , A 22 , and A 31 to A 34 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 , L 10 , L 20 , and L 30 are each independently *—O—*′, *—S—*′, *—N*(Ar 15 )—*′, 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 , Ar 15 is the same as described in connection with Ar 11 , L 11 to L 14 and L 21 to L 24 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 to a14 and a21 to a24 are each independently an integer from 0 to 10, a10, a20, and a30 are each independently an integer from 1 to 5, R 21 , R 22 , R 31 to R 34 , Z 21a , Z 21b , Z 31a , Z 31b , Z 32a , and Z 32 b 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 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 , —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 ), c21, c22, and c31 to c34 are each independently an integer from 0 to 10, n is an integer from 1 to 5, R 10a is: deuterium (-D), —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 -Coo arylthio 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 a combination thereof; a C 3 -C 60 carbocyclic group, a C 1 -C 60 heterocyclic group, a C 6 -C 60 aryloxy group, or a C 6 -C 60 arylthio 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, —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 a 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 ), 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; or 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 a combination thereof, when a heteroatom included in the C 1 -C 60 heterocyclic group is a nitrogen atom, the nitrogen atom is 14 N or 15 N, a nitrogen atom included in the cyano group or the nitro group is 14 N or 15 N, and the at least one first compound is not Compound A:
  10. 10 . The light-emitting device of claim 9 , wherein the at least one first compound includes two or more N(s), and when two N(s) from among the two or more N(s) are linked to a heteroatom-free group, at least one of the two N(s) is 15 N.
  11. 11 . The light-emitting device of claim 9 , wherein each N included in the at least one first compound is 15 N.
  12. 12 . The light-emitting device of claim 9 , wherein the at least one first compound included in the first layer includes 15 N in the number of m 11 , the at least one first compound included in the second layer includes 15 N in the number of m 12 , and m 11 is greater than m 12 .
  13. 13 . The light-emitting device of claim 9 , wherein the hole transport region includes at least one of a first compound selected from Compounds 1 to 24:
  14. 14 . The light-emitting device of claim 9 , wherein the emission layer includes a first emission layer, a second emission layer, and a third emission layer each having different emission colors, the hole transport region includes a first emission auxiliary layer between the first electrode and the first emission layer, a second emission auxiliary layer between the first electrode and the second emission layer, and a third emission auxiliary layer between the first electrode and the third emission layer, and at least one of the first emission auxiliary layer, the second emission auxiliary layer, and the third emission auxiliary layer includes the at least one first compound.

Description

CROSS-REFERENCE TO RELATED APPLICATION(S) This application claims priority to and benefits of Korean Patent Application No. 10-2020-0078803 under 35 U.S.C. § 119, filed on Jun. 26, 2020 in the Korean Intellectual Property Office, the entire contents of which are incorporated herein by reference. BACKGROUND 1. Technical Field Embodiments relate to a light-emitting device and an electronic apparatus including the light-emitting device. 2. Description of the Related Art Among light-emitting devices, organic light-emitting devices are self-emission devices that have wide viewing angles, high contrast ratios, short response times, and excellent characteristics in terms of brightness, driving voltage, and response speed, compared to devices in the art. Organic light-emitting devices may include a first electrode disposed on a substrate, and a hole transport region, an emission layer, an electron transport region, and a second electrode sequentially stacked on the first electrode. Holes provided from the first electrode may move toward the emission layer through the hole transport region, and electrons provided from the second electrode may move toward the emission layer through the electron transport region. Carriers, such as the holes and the electrons, recombine in the emission layer to produce excitons. These excitons transition from an excited state to a ground state to thereby generate light. SUMMARY Embodiments relate to a light-emitting device including a compound having excellent light-emission efficiency and high stability, and an electronic apparatus including the light-emitting device. Additional aspects will be set forth in part in the description which follows and, in part, will be apparent from the description, or may be learned by practice of the embodiments of the disclosure. According to an aspect, a light-emitting device is provided that may include a first electrode, a second electrode facing the first electrode, and an interlayer between the first electrode and the second electrode, wherein the interlayer may include an emission layer, and a hole transport region between the emission layer and the first electrode,the hole transport region may include at least one first compound including 15N in the number of m1,15N in the number of m1 may be linked to a neighboring carbon (C) via a single bond,m1 may be an integer equal to or greater than 1, andthe at least one first compound may not be Compound A: In an embodiment, at least one C from among C linked to 15N in the number of m1 via a single bond may be 12C. In an embodiment, m1 may be an integer from 1 to 10. In an embodiment, at least one 15N from among 15N in the number of m1 may form a part of a cyclic group included in the at least one first compound. In an embodiment, at least one 15N from among 15N in the number of m1 may not form a part of a cyclic group included in the at least one first compound. In an embodiment, the at least one first compound may further include 14N in the number of m2, 14N in the number of m2 may be linked to a neighboring carbon (C) via a single bond, and m2 may be an integer equal to or greater than 1. In an embodiment, at least one 14N from among 14N in the number of m2 may not form a part of a cyclic group included in the at least one first compound. In an embodiment, the at least one first compound may include two or more N(s), and when two N(s) from among the two or more N(s) are linked to a heteroatom-free group, at least one of the two N(s) may be 15N. In an embodiment, the at least one first compound may include two or more N(s), the two or more N(s) may each form a first cyclic group and a second cyclic group, and when the first cyclic group and the second cyclic group form a condensed ring with each other, at least one of the two or more N(s) may be 15N. In an embodiment, each N included in the at least one first compound may be 15N. In an embodiment, the at least one first compound may further include O, S, Si, P, B, or a combination thereof. In an embodiment, each of the at least one first compound may be represented by one of Formulae 1, 1-1, 2, 2-1, and 3: In Formulae 1, 1-1, 2, 2-1, and 3, Y21 may be O, S, Se, C(Z21a)(Z21b), Si(Z21a)(Z21b), or N*(Z21a),Y31 may be O, S, Se, C(Z31a)(Z31b), Si(Z31a)(Z31b), or N*(Z31a),Y32 may be O, S, Se, C(Z32a)(Z32b), Si(Z32a)(Z32b), or N*(Z32a),N* may be 14N or 15N,at least one N* in Formula 1, 1-1, 2, 2-1, or 3 may be 15N,b21, b31, and b32 may each independently be an integer from 0 to 3,Ar11 to Ar14, Ar21, Ar22, and Ar24 may each independently be a C3-C60 carbocyclic group unsubstituted or substituted with at least one R10a or a C1-C60 heterocyclic group unsubstituted or substituted with at least one R10a,ring A21, A22, and A31 to A34 may each independently be a C3-C60 carbocyclic group unsubstituted or substituted with at least one R10a or a C1-C60 heterocyclic group unsubstituted or substituted with at least one R10a,L10, L20, and L30 may each independently be *