US-12622130-B2 - Light-emitting device and electronic apparatus including the same

US12622130B2US 12622130 B2US12622130 B2US 12622130B2US-12622130-B2

Abstract

Embodiments provide a light-emitting device that include 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 the emission layer includes a first emission layer and a second emission layer. The first emission layer includes a first host and a first-first dopant, or a first host, a first-first dopant, and a first-second dopant. The second emission layer includes a second host and a second-first dopant, or a second host, a second-first dopant, and a second-second dopant. The emission layer includes the first-second dopant and/or the second-second dopant, the first emission layer and the second emission layer directly contact each other, and a thickness of the second emission layer is greater than a thickness of the first emission layer.

Inventors

Sungsoo BAE
Tsuyoshi Naijo
Hojung Syn
Hyosup Shin
Jiyoung Lee
Changwoong CHU

Assignees

SAMSUNG DISPLAY CO., LTD.

Dates

Publication Date: 20260505
Application Date: 20230912
Priority Date: 20230224

Claims (20)

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 comprises an emission layer, the emission layer comprises a first emission layer and a second emission layer, the first emission layer comprises: a first host and a first-first dopant; or a first host, a first-first dopant, and a first-second dopant, the second emission layer comprises: a second host and a second-first dopant; or a second host, a second-first dopant, and a second-second dopant, the emission layer comprises the first-second dopant and/or the second-second dopant, the first emission layer and the second emission layer directly contact each other, the first-first dopant and the second-first dopant each independently comprise an organometallic compound, the first-second dopant and the second-second dopant each independently comprise a delayed fluorescence dopant comprising boron and nitrogen, and a thickness of the second emission layer is greater than a thickness of the first emission layer.
2 . The light-emitting device of claim 1 , wherein a hole-trapping ability of the second emission layer is greater than a hole-trapping ability of the first emission layer.
3 . The light-emitting device of claim 1 , wherein a metal of the organometallic compound is Pt or Ir.
4 . The light-emitting device of claim 1 , wherein the first electrode is an anode, the second electrode is a cathode, the interlayer further comprises a hole transport region between the first electrode and the emission layer, and the hole transport region comprises a hole injection layer, a hole transport layer, an electron-blocking layer, or a combination thereof.
5 . The light-emitting device of claim 1 , wherein the first electrode is an anode, the second electrode is a cathode, the interlayer further comprises an electron transport region between the second electrode and the emission layer, and the electron transport region comprises a hole-blocking layer, an electron transport layer, an electron injection layer, or a combination thereof.
6 . The light-emitting device of claim 1 , wherein the emission layer emits green light.
7 . The light-emitting device of claim 1 , wherein the first host and the second host are each independently a single host or a mixed host.
8 . The light-emitting device of claim 1 , wherein the first host and the second host are each independently a hole-transporting host, an electron-transporting host, or a bipolar host.
9 . The light-emitting device of claim 1 , wherein a thickness of the first emission layer is in a range of about 1 nm to about 20 nm, and a thickness of the second emission layer is in a range of about 20 nm to about 35 nm.
10 . The light-emitting device of claim 1 , wherein a weight ratio of the first host to the second host is in a range of about 1:9 to about 9:1.
11 . The light-emitting device of claim 1 , wherein an amount of the first-second dopant and an amount of the second-second dopant are each independently in a range of about 0.1 wt % to about 2.5 wt %.
12 . The light-emitting device of claim 1 , wherein the first host and the second host each independently comprise a compound represented by Formula 301, Formula 301-1, or Formula 301-2: [Ar 301 ] xb11 -[(L 301 ) xb1 -R 301 ] xb21 [Formula 301] wherein in Formula 301, Ar 301 and L 301 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 , xb11 is 1, 2, or 3, xb1 is an integer from 0 to 5, R 301 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 , —Si(Q 301 )(Q 302 )(Q 303 ), —N(Q 301 )(Q 302 ), —B(Q 301 )(Q 302 ), —C(═O)(Q 301 ), —S(═O) 2 (Q 301 ), or —P(═O)(Q 301 )(Q 302 ), xb21 is an integer from 1 to 5, and Q 301 to Q 303 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, a C 1 -C 60 heterocyclic group, a C 7 -C 60 arylalkyl group, or a C 2 -C 60 heteroarylalkyl 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, wherein in Formulae 301-1 and 301-2, ring A 301 to ring A 304 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 , X 301 is O, S, N-[(L 304 ) xb4 -R 304 ], C(R 304 )(R 305 ), or Si(R 304 )(R 305 ), xb22 and xb23 are each independently 0, 1, or 2, L 301 to L 304 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 , xb1 to xb4 are each independently an integer from 0 to 5, R 301 to R 305 and R 311 to R 314 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 , —Si(Q 301 )(Q 302 )(Q 303 ), —N(Q 301 )(Q 302 ), —B(Q 301 )(Q 302 ), —C(═O)(Q 301 ), —S(═O) 2 (Q 301 ), or —P(═O)(Q 301 )(Q 302 ), Q 301 to Q 303 are each the same as described in Formula 301, 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 a 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 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 ), and 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, or a C 1 -C 60 alkoxy group; or a C 3 -C 60 carbocyclic group, a C 1 -C 60 heterocyclic group, a C 7 -C 60 arylalkyl group, or a C 2 -C 60 heteroarylalkyl 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.
13 . The light-emitting device of claim 1 , wherein an amount of the first-first dopant and an amount of the second-first dopant are each independently in a range of about 5.0 wt % to about 15.0 wt %.
14 . The light-emitting device of claim 1 , wherein the first-first dopant and the second-first dopant each independently comprise an organometallic compound represented by Formula 401: wherein in Formulae 401 and 402, M is Ir or Pt, L 401 is a ligand represented by Formula 402, xc1 is 1, 2, or 3, when xc1 is 2 or more, two or more of L 401 are identical to or different from each other, L 402 is an organic ligand, xc2 is 0, 1, 2, 3, or 4, when xc2 is 2 or more, two or more of L 402 are identical to or different from each other, X 401 and X 402 are each independently nitrogen or carbon, ring A 401 and ring A 402 are each independently a C 3 -C 60 carbocyclic group or a C 1 -C 60 heterocyclic group, T401 is a single bond, —O—, —S—, —C(═O)—, —N(Q 411 )—, —C(Q 411 )(Q 412 )-, —C(Q 411 )=C(Q 412 )-, —C(Q 411 )=, or ═C═, X 403 and X 404 are each independently a chemical bond, O, S, N(Q 413 ), B(Q 413 ), P(Q 413 ), C(Q 413 )(Q 414 ), or Si(Q 413 )(Q 414 ), R 401 and R 402 are each independently hydrogen, deuterium, —F, —Cl, —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 401 )(Q 402 )(Q 403 ), —N(Q 401 )(Q 402 ), —B(Q 401 )(Q 402 ), —C(═O)(Q 401 ), —S(═O) 2 (Q 401 ), or —P(═O)(Q 401 )(Q 402 ), Q 411 to Q 414 and Q 401 to Q 403 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, a C 1 -C 60 heterocyclic group, a C 7 -C 60 arylalkyl group, or a C 2 -C 60 heteroarylalkyl 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, xc11 and xc12 are each independently an integer from 0 to 10, * and *′ in Formula 402 each indicate a binding site to M in Formula 401, when M is Pt, a ligand of Formula 401 comprises a pyridine moiety, 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 a 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 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 ), and 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, or a C 1 -C 60 alkoxy group; or a C 3 -C 60 carbocyclic group, a C 1 -C 60 heterocyclic group, a C 7 -C 60 arylalkyl group, or a C 2 -C 60 heteroarylalkyl 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.
15 . The light-emitting device of claim 1 , wherein the first-second dopant and the second-second dopant each independently comprise the following moiety:
16 . The light-emitting device of claim 1 , wherein the first-second dopant and the second-second dopant each independently comprise a t-butyl group.
17 . An electronic apparatus comprising the light-emitting device of claim 1 .
18 . The electronic apparatus of claim 17 , further comprising: a thin-film transistor, wherein the thin-film transistor comprises 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.
19 . The electronic apparatus of claim 18 , further comprising a color filter, a color conversion layer, a touch screen layer, a polarizing layer, or a combination thereof.
20 . An electronic equipment comprising the light-emitting device of claim 1 , wherein the electronic equipment is a flat panel display, a curved display, a computer monitor, a medical monitor, a television, a billboard, an indoor light, an outdoor light, a signal light, a head-up display, a fully transparent display, a partially transparent display, a flexible display, a rollable display, a foldable display, a stretchable display, a laser printer, a telephone, a portable phone, a tablet personal computer, a phablet, a personal digital assistant (PDA), a wearable device, a laptop computer, a digital camera, a camcorder, a viewfinder, a micro display, a three-dimensional (3D) display, a virtual reality display, an augmented reality display, a vehicle, a video wall with multiple displays tiled together, a theater screen, a stadium screen, a phototherapy device, or a signboard.

Description

CROSS-REFERENCE TO RELATED APPLICATION(S) This application claims priority to and benefits of Korean Patent Application No. 10-2023-0025286 under 35 U.S.C. § 119, filed on Feb. 24, 2023, 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 same. 2. Description of the Related Art Light-emitting devices are self-emissive devices that, as compared with devices of the related art, have wide viewing angles, high contrast ratios, short response times, and excellent characteristics in terms of luminance, driving voltage, and response speed. In an example, a light-emitting device may have a structure in which a first electrode is arranged on a substrate, and a hole transport region, an emission layer, an electron transport region, and a second electrode are sequentially formed 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 light. It is to be understood that this background of the technology section is, in part, intended to provide useful background for understanding the technology. However, this background of the technology section may also include ideas, concepts, or recognitions that were not part of what was known or appreciated by those skilled in the pertinent art prior to a corresponding effective filing date of the subject matter disclosed herein. SUMMARY Embodiments include a light-emitting device having improved efficiency and lifespan. 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 embodiments, a light-emitting device may include a first electrode, a second electrode facing the first electrode, andan interlayer between the first electrode and the second electrode, whereinthe interlayer may include an emission layer,the emission layer may include a first emission layer and a second emission layer,the first emission layer may include: a first host and a first-first dopant; or a first host, a first-first dopant, and a first-second dopant,the second emission layer may include: a second host and a second-first dopant; or a second host, a second-first dopant, and a second-second dopant,the emission layer may include the first-second dopant and/or the second-second dopant,the first emission layer and the second emission layer directly contact each other,the first-first dopant and the second-first dopant may each independently include an organometallic compound,the first-second dopant and the second-second dopant may each independently include a delayed fluorescence dopant including boron and nitrogen, anda thickness of the second emission layer may be greater than a thickness of the first emission layer. In an embodiment, a hole-trapping ability of the second emission layer may be greater than a hole-trapping ability of the first emission layer. In an embodiment, a metal of the organometallic compound may be Pt or Ir. In an embodiment, the first electrode may be an anode; the second electrode may be a cathode; the interlayer may further include a hole transport region between the first electrode and the emission layer; and the hole transport region may include a hole injection layer, a hole transport layer, an electron-blocking layer, or any combination thereof. In an embodiment, the first electrode may be an anode; the second electrode may be a cathode; the interlayer may further include an electron transport region between the second electrode and the emission layer; and the electron transport region may include a hole-blocking layer, an electron transport layer, an electron injection layer, or any combination thereof. In an embodiment, the emission layer may emit green light. In an embodiment, the first host and the second host may each independently be a single host or a mixed host. In an embodiment the first host and the second host may each independently be a hole-transporting host, an electron-transporting host, or a bipolar host. In an embodiment, a thickness of the first emission layer may be in a range of about 1 nm to about 20 nm; and a thickness of the second emission layer may be in a range of about 20 nm to about 35 nm. In an embodiment, a weight ratio of the first host to the second host may be in a range of about 1:9 to about 9:1. In an embodiment, an amount of the first-second dopant and an amount of the second-second dopant may each independently be in a range of about 0.1 wt % to about 2.5 wt %. In an embodiment, the first host and the second host each independently comprise a com