Light-emitting device and electronic apparatus including the same
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.
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.