Organic electroluminescent element, light emitting device, lighting device, display device and electronic device

Patent metadata

Field	Value
Publication number	US-2016197282-A1
Application number	US-201414911941-A
Country	US
Kind code	A1
Filing date	Aug 14, 2014
Priority date	Aug 16, 2013
Publication date	Jul 7, 2016
Grant date	—

Abstract

An organic electroluminescent element contains at least one organic layer that is interposed between an anode and a cathode. The organic layer includes a light emitting layer. The light emitting layer contains a light emitting compound that has a stokes shift within the range of 0-0.24 eV and a lowest excited singlet energy (S 1 ) of 2.64 eV or more.

First claim

1 . An organic electroluminescent element comprising:
an anode; a cathode; and at least one organic layer disposed between the anode and the cathode, the organic layer comprising a light-emitting layer, wherein the light-emitting layer contains a light-emitting compound having a Stokes shift of 0 to 0.24 eV and a lowest excited singlet energy level S 1 of 2.64 eV or more.

2 . The organic electroluminescent element according to claim 1 , wherein the light-emitting compound has a structure represented by Formula (1):

wherein A, B, and C each independently represent a single bond or a linking group containing a carbon, silicon, or oxygen atom; Ar 1 and Ar 2 each independently represent an aromatic hydrocarbon or heterocyclic group optionally having a condensed ring structure; Ar 1 and Ar 2 are optionally identical to each other; k represents a natural number and if k is 2 or more, the groups A are optionally different from one another; m is 0 or a natural number and if m is 2 or more, the groups B are optionally different from one another; n is 0 or a natural number and if n is 2 or more, the groups C are optionally different from one another; and each of A, B, and C independently optionally links Ar 1 and Ar 2 with a single bond or through formation of a condensed ring.

3 . The organic electroluminescent element according to claim 1 , wherein the light-emitting compound has a non-planar electronic conjugated structure.

4 . The organic electroluminescent element according to claim 1 , wherein the light-emitting compound has a structure represented by Formula (2):

wherein Ar 1 ′, Ar 1 ″, Ar 2 ′, and Ar 2 ″ are optionally identical to or different from one another and each independently represent an aromatic hydrocarbon or heterocyclic group optionally having a condensed ring structure and a substituent; Ar 1 ′ and Ar 1 ″ optionally form a condensed ring, and Ar 2 ′ and Ar 2 ″ optionally form a condensed ring; a, b, c, and d each represent 0 or a natural number; a or b represents a natural number; c or d represents a natural number; L 1 and L 2 each represent a single bond or divalent linking group that links Ar 1 ′ and Ar 1 ″; Ar 1 ′ and Ar 1 ″ optionally form a condensed ring with L 1 and L 2 ; L 3 and L 4 each represent a single bond or divalent linking group that links Ar 2 ′ and Ar 2 ″; Ar 2 ′ and Ar 2 ″ optionally form a condensed ring with L 3 and L 4 ; if a, b, c, or d is 2 or more, the groups L 1 , L 2 , L 3 , or L 4 are optionally identical to or different from one another; k and m each represent 0 or a natural number; k or m represents a natural number; A and B each represent a single bond or a divalent linking group; if k or m is 2 or more, the groups A or B are optionally identical to or different from one another; and Ar 1 ′, Ar 2 ′, and A optionally form a condensed ring, and Ar 1 ″, Ar 2 ″, and B optionally form a condensed ring.

5 . The organic electroluminescent element according to claim 1 , wherein the light-emitting compound has a structure represented by Formula (3):

wherein A and B each independently represent a single bond or a linking group containing a carbon or silicon atom; two anthracene rings linked by A and/or B optionally form a condensed ring with R 1 , R 9 , and A or with R 7 , R 15 , and B; k represents a natural number and if k is 2 or more, the groups A are optionally different from one another; R 1 to R 16 each represent a substituted or unsubstituted aliphatic hydrocarbon group or a substituted or unsubstituted aromatic hydrocarbon group, and optionally form a ring; each of R 1 to R 16 is optionally a heteroaromatic hydrocarbon group containing a nitrogen, oxygen, or sulfur atom; m represents 0 or a natural number and if m is 2 or more, the groups B are optionally different from one another; and each of the two anthracene rings linked by A and/or B optionally has a non-planar electronic conjugated structure, or the two anthracene rings optionally form a single aromatic ring.

6 . The organic electroluminescent element according to claim 1 , wherein the light-emitting compound has a structure represented by Formula (4):

wherein X represents boron, carbon, nitrogen, oxygen, sulfur, or silicon; X optionally has a hydrogen atom or a substituent; R 17 to R 28 each independently represent a hydrogen atom or a substituent; two aromatic rings linked by A and/or B optionally form a condensed ring structure with any of R 17 to R 28 , A, and B; k and m each represent 0 or a natural number; k or m represents a natural number; A and B each represent a single bond or a divalent linking group; if k or m is 2 or more, the groups A or B are optionally identical to or different from one another; and each of the two aromatic rings linked by A and/or B optionally has a non-planar electronic conjugated structure, or the two aromatic rings optionally form a single aromatic ring.

7 . The organic electroluminescent element according to claim 1 , wherein the light-emitting compound has a structure represented by Formula (5):

wherein X represents boron, carbon, nitrogen, oxygen, sulfur, or silicon; X optionally has a hydrogen atom or a substituent; R 29 to R 40 each represent a hydrogen atom or a substituent; two aromatic rings linked by A and/or B optionally form a condensed ring structure with any of R 29 to R 40 , A, and B; k and m each represent 0 or a natural number; k or m represents a natural number; A and B each represent a single bond or a divalent linking group; if k or m is 2 or more, the groups A or B are optionally identical to or different from one another; and each of the two aromatic rings linked by A and/or B optionally has a non-planar electronic conjugated structure, or the two aromatic rings optionally form a single aromatic ring.

8 . The organic electroluminescent element according to claim 1 , wherein the light-emitting layer contains a carbazole derivative.

9 . The organic electroluminescent element according to claim 8 , wherein the carbazole derivative is a compound having two or more conjugated structures each having 14 or more π-electrons.

10 . The organic electroluminescent element according to claim 8 , wherein the carbazole derivative is a compound having a structure represented by Formula (SH):

wherein Z 1 to Z 3 and R 41 to R 46 each independently represent a hydrogen atom or a substituent; at least one of Z 1 to Z 3 and R 41 to R 46 represents an aromatic cyclic group having 14 or more π-electrons; and adjacent substituents optionally form a ring structure through condensation.

11 . The organic electroluminescent element according to claim 10 , wherein at least one of Z 1 to Z 3 in Formula (SH) is a substituted or unsubstituted benzofuran ring.

12 . A light-emitting device comprising the organic electroluminescent element according to claim 1 .

13 . A lighting device comprising the organic electroluminescent element according to claim 1 .

14 . A display device comprising the organic electroluminescent el

Assignees

• Konica Minolta Inc

Inventors

• Tanimoto Shuho
• Ikemizu Dai
• Tanaka Tatsuo
• Taka Hideo
• Kita Hiroshi

Classifications

• H01L51/5012

  Electricity · mapped topic

• C09K11/06 Primary

  containing organic luminescent materials · CPC title

• H01L51/0073

  Electricity · mapped topic

• H01L51/0054

  Electricity · mapped topic

• H01L51/0072

  Electricity · mapped topic