Light-emitting device and electronic apparatus including the same

Patent metadata

Field	Value
Publication number	US-12568758-B2
Application number	US-202318364157-A
Country	US
Kind code	B2
Filing date	Aug 2, 2023
Priority date	Feb 9, 2023
Publication date	Mar 3, 2026
Grant date	Mar 3, 2026

Abstract

Embodiments provide a light-emitting device including a first electrode, a second electrode facing the first electrode, m emitting units between the first electrode and the second electrode, and m-1 charge generation layers between adjacent ones of the m emitting units, wherein m is an integer of 3 or more, and the emitting units include a first emitting unit, a second emitting unit, and a third emitting unit. The first emitting unit includes a first-first host and a first-second host, the second emitting unit includes a second-first host and a second-second host, the third emitting unit includes a third-first host and a third-second host, and T 1 values of hosts of at least one of a first emitting unit, a second emitting unit, and a third emitting unit are each smaller than T 1 values of hosts of the other emitting units.

First claim

What is claimed is:

1 . A light-emitting device comprising:
a first electrode; a second electrode facing the first electrode; m emitting units between the first electrode and the second electrode; and m-1 charge generation layers between adjacent ones of the m emitting units, wherein m is an integer of 3 or more, and the emitting units include a first emitting unit, a second emitting unit, and a third emitting unit, the first emitting unit includes a first-first host and a first-second host, the second emitting unit includes a second-first host and a second-second host, the third emitting unit includes a third-first host and a third-second host, T 1 values of the hosts of at least one of the first emitting unit, the second emitting unit, and the third emitting unit are each smaller than T 1 values of the hosts of the other emitting units, T 1 values of the hosts of at least one of the emitting units are each independently greater than or equal to about 2.89 eV, and each of the first emitting unit, the second emitting unit, and the third emitting unit includes a phosphorescent dopant and a fluorescent dopant.

2 . The light-emitting device of claim 1 , wherein
the T 1 value of the second-first host and the T 1 value of the second-second host are each smaller than the T 1 value of the first-first host and the T 1 value of the first-second host, and the T 1 value of the third-first host and the T 1 value of the third-second host are each smaller than the T 1 value of the first-first host and the T 1 value of the first-second host; the T 1 value of the first-first host and the T 1 value of the first-second host are each smaller than the T 1 value of the third-first host and the T 1 value of the third-second host, and the T 1 value of the second-first host and the T 1 value of the second-second host are each smaller than the T 1 value of the third-first host and the T 1 value of the third-second host; or the T 1 value of the first-first host and the T 1 value of the first-second host are each smaller than the T 1 value of the second-first host and the T 1 value of the second-second host, and the T 1 value of the third-first host and the T 1 value of the third-second host are each smaller than the T 1 value of the second-first host and the T 1 value of the second-second host.

3 . The light-emitting device of claim 1 , wherein
the T 1 value of the third-first host and the T 1 value of the third-second host are each smaller than the T 1 value of the first-first host and the T 1 value of the first-second host, and the T 1 value of the third-first host and the T 1 value of the third-second host are each smaller than the T 1 value of the second-first host and the T 1 value of the second-second host; the T 1 value of the first-first host and the T 1 value of the first-second host are each smaller than the T 1 value of the second-first host and the T 1 value of the second-second host, and the T 1 value of the first-first host and the T 1 value of the first-second host are each smaller than the T 1 value of the third-first host and the T 1 value of the third-second host; or the T 1 value of the second-first host and the T 1 value of the second-second host are each smaller than the T 1 value of the first-first host and the T 1 value of the first-second host, and the T 1 value of the second-first host and the T 1 value of the second-second host are each smaller than the T 1 value of the third-first host and the T 1 value of the third-second host.

4 . The light-emitting device of claim 1 , wherein
the first electrode is an anode and the second electrode is a cathode; or the second electrode is an anode and the first electrode is a cathode.

5 . The light-emitting device of claim 1 , wherein the T 1 values of the hosts of at least one of the emitting units are each independently in a range of about 2.89 eV to about 3.00 eV.

6 . The light-emitting device of claim 1 , wherein the T 1 values of the hosts of emitting units other than at least one of the first emitting unit, the second emitting unit, and the third emitting unit are each independently greater than or equal to about 3.00 eV.

7 . The light-emitting device of claim 1 , wherein the first emitting unit, the second emitting unit, and the third emitting unit each emit blue light.

8 . The light-emitting device of claim 1 , wherein
the second emitting unit is between the first emitting unit and the third emitting unit, and either the T 1 values of the first-first host and the first-second host are each independently in a range of about 3.00 eV to about 3.10 eV, and the T 1 values of the third-first host and the third-second host are each independently in a range of about 2.89 eV to about 3.00 eV, or the T 1 values of the third-first host and the third-second host are each independently in a range of about 3.00 eV to about 3.10 eV, and the T 1 values of the first-first host and the first-second host are each independently in a range of about 2.89 eV to about 3.00 eV.

9 . The light-emitting device of claim 8 , wherein
the first emitting unit is closest to the second electrode, and the third emitting unit is closest to the first electrode.

10 . The light-emitting device of claim 8 , wherein
the first emitting unit is closest to the first electrode, and the third emitting unit is closest to the second electrode.

11 . The light-emitting device of claim 8 , wherein the T 1 values of the second-first host and the second-second host are each independently in a range of about 2.89 eV to about 3.00 eV.

12 . The light-emitting device of claim 8 , wherein the T 1 values of the second-first host and the second-second host are each independently in a range of about 3.00 eV to about 3.10 eV.

13 . The light-emitting device of claim 1 , wherein
one of the first-first host and the first-second host is a hole-transporting host, and the other thereof is an electron-transporting host; one of the second-first host and the second-second host is a hole-transporting host, and the other thereof is an electron-transporting host; or one of the third-first host and the third-second host is a hole-transporting host, and the other thereof is an electron-transporting host.

14 . The light-emitting device of claim 1 , wherein
the first-first host and the first-second host are respectively identical to the second-first host and the second-second host; or the second-first host and the second-second host are respectively identical to the third-first host and the third-second host.

15 . The light-emitting device of claim 1 , wherein the phosphorescent dopant comprises an organometallic compound represented by Formula 401:

wherein in Formulae 401 and 402,
M is a transition metal,
L 401 is a ligand represented by Formula 402, and
xc1 is 1, 2, or 3,
when xc1 is 2 or more, two or more of L 401 may be identical to or different from each other,
L 402 is an organic ligand,
xc2 may be 0, 1, 2, 3, or 4,
when xc2 is 2 or more, two or more of L 402 may be identical to or different from each other,
X 401 and X 402 are each independently N or C,
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,
T 401 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 a

Assignees

• Samsung Display Co Ltd

Inventors

• Kim Eungdo
• Kang Yujin
• Kim Minje
• Kim Seongkeun
• Kim Hyunyoung
• Kim Hyojeong
• Lee Youngki
• Lee Jungsub
• Lee Hyunwoo
• Jun Mieun

Classifications

• H10K85/624 Primary

  containing six or more rings · CPC title

• H10K2101/90

  Multiple hosts in the emissive layer · CPC title

• H10K85/6576

  comprising only sulfur in the heteroaromatic polycondensed ring system, e.g. benzothiophene · CPC title

• H10K85/6574

  comprising only oxygen in the heteroaromatic polycondensed ring system, e.g. cumarine dyes · CPC title

• H10K85/626

  containing more than one polycyclic condensed aromatic rings, e.g. bis-anthracene · CPC title