Organic electroluminescent element and electronic device

Patent metadata

Field	Value
Publication number	US-10135000-B2
Application number	US-201515128806-A
Country	US
Kind code	B2
Filing date	Mar 25, 2015
Priority date	Mar 31, 2014
Publication date	Nov 20, 2018
Grant date	Nov 20, 2018

Abstract

An organic electroluminescence device includes an anode, a cathode, and an emitting layer, in which the emitting layer contains a first compound, a second compound, and a third compound, a singlet energy S(M1) of the first compound and a singlet energy S(M2) of the second compound satisfy a numerical formula (Numerical Formula 1) below, an electron affinity Af(M1) of the first compound and an electron affinity Af(M2) of the second compound satisfy a numerical formula (Numerical Formula 2) below, and a triplet energy T(M1) of the first compound satisfies a numerical formula (Numerical Formula 3) below,

S ( M 2)≥ S ( M 1)×0.95  (Numerical Formula 1)

Af ( M 2)− Af ( M 1)≥0.2 eV   (Numerical Formula 2)

T ( M 1)≤2.0 eV   (Numerical Formula 3).

First claim

The invention claimed is:

1. An organic electroluminescence device comprising:
an anode;
a cathode; and
an emitting layer, wherein
the emitting layer comprises a first compound, a second compound, and a third compound,
a singlet energy S(M1) of the first compound and a singlet energy S(M2) of the second compound satisfy a relationship of Numerical Formula 1 below,
an electron affinity Af(M1) of the first compound and an electron affinity Af(M2) of the second compound satisfy a relationship of Numerical Formula 2 below, and
a triplet energy T(M1) of the first compound satisfies a relationship of Numerical Formula 3 below,
S ( M 2)≥ S ( M 1)×0.95  (Numerical Formula 1)

Af ( M 2)- Af ( M 1)≥0.2 eV   (Numerical Formula 2)

T ( M 1)≤2.0 eV   (Numerical Formula 3).

2. The organic electroluminescence device according to claim 1 , wherein
the singlet energy S(M1) of the first compound and the singlet energy S(M2) of the second compound satisfy a relationship of Numerical Formula 4 below,
S ( M 2)≥ S ( M 1)  (Numerical Formula 4).

3. The organic electroluminescence device according to claim 1 , wherein
the singlet energy S(M2) of the second compound satisfies a relationship of Numerical Formula 5 below,
S ( M 2)≥3.0 eV   (Numerical Formula 5).

4. The organic electroluminescence device according to claim 1 , wherein
the electron affinity Af(M1) of the first compound and the electron affinity Af(M2) of the second compound satisfy a relationship of Numerical Formula 6 below,
Af ( M 2)- Af ( M 1)>0.2 eV   (Numerical Formula 6).

5. The organic electroluminescence device according to claim 1 , wherein
an ionization potential Ip(M3) of the third compound and an ionization potential Ip(M1) of the first compound satisfy a relationship of Numerical Formula 10 below,
Ip ( M 1)- Ip ( M 3)≥0.2 eV   (Numerical Formula 10).

6. The organic electroluminescence device according to claim 1 , wherein
a singlet energy S(M3) of the third compound and the singlet energy S(M1) of the first compound satisfy a relationship of Numerical Formula 12 below,
S ( M 1)> S ( M 3)  (Numerical Formula 12).

7. The organic electroluminescence device according to claim 1 , wherein
the triplet energy T(M1) of the first compound and a triplet energy T(M2) of the second compound satisfy a relationship of Numerical Formula 7 below,
T ( M 1)< T ( M 2)  (Numerical Formula 7).

8. The organic electroluminescence device according to claim 7 , wherein the third compound is a fluorescent material.

9. The organic electroluminescence device according to claim 1 , wherein
the first compound is represented by a formula (1) below,

where: Ar 11 and Ar 12 are each independently a substituted or unsubstituted aromatic hydrocarbon group having 6 to 30 ring carbon atoms, or substituted or unsubstituted heterocyclic group having 5 to 30 ring atoms.

10. The organic electroluminescence device according to claim 9 , wherein
Ar 11 and Ar 12 are each independently a substituted or unsubstituted phenyl group.

11. The organic electroluminescence device according to claim 9 , wherein
Ar 11 is a substituted or unsubstituted naphthyl group and Ar 12 is a substituted or unsubstituted phenyl group.

12. The organic electroluminescence device according to claim 9 , wherein
Ar 11 is any one group selected from the group consisting of a substituted or unsubstituted phenanthryl group, substituted or unsubstituted benzoanthryl group, 9,9-dimethylfluorenyl group, 9,9-diphenylfluorenyl group, substituted or unsubstituted dibenzofuranyl group, substituted or unsubstituted dibenzothiophenyl group, substituted or unsubstituted naphthobenzofuranyl group, substituted or unsubstituted naphthobenzothiophenyl group, and substituted or unsubstituted naphthobenzofluorenyl group, and
Ar 12 is a substituted or unsubstituted phenyl group or a substituted or unsubstituted naphthyl group.

13. The organic electroluminescence device according to claim 1 , wherein
the second compound is represented by a formula (21) below,

where: R 21 to R 26 are each independently a hydrogen atom or a substituent, and, when R 21 to R 26 are substituents, each of the substituents is a substituent selected from the group consisting of a halogen atom, a hydroxyl group, a cyano group, a substituted or unsubstituted alkyl group having 1 to 30 carbon atoms, a substituted or unsubstituted alkoxy group having 1 to 30 carbon atoms, a substituted or unsubstituted aryloxy group having 6 to 30 ring carbon atoms, a substituted or unsubstituted alkylthio group having 1 to 30 carbon atoms, a substituted or unsubstituted arylthio group having 6 to 30 ring carbon atoms, a silyl group represented by -Si(R 221 ) 3 , an amino group represented by -N(R 222 ) 2 , a substituted or unsubstituted aromatic hydrocarbon group having 6 to 30 ring carbon atoms, and a substituted or unsubstituted heterocyclic group having 5 to 30 ring atoms;
R 221 is each independently a hydrogen atom or a substituent, and when R 221 is a substituent, the substituent is a substituted or unsubstituted alkyl group having 1 to 30 carbon atoms, or a substituted or unsubstituted aromatic hydrocarbon group having 6 to 30 ring carbon atoms;
a plurality of R 221 are mutually the same or different;
R 222 is each independently a hydrogen atom or a substituent, and when R 222 is a substituent, the substituent is a substituted or unsubstituted alkyl group having 1 to 30 carbon atoms, or a substituted or unsubstituted aromatic hydrocarbon group having 6 to 30 ring carbon atoms;
a plurality of R 222 are mutually the same or different;
pa is 4 and a plurality of R 21 are mutually the same or different;
pb is 2 and a plurality of R 22 are mutually the same or different;
pc is 3 and a plurality of R 23 are mutually the same or different;
pd is 4 and a plurality of R 24 are mutually the same or different;
pe is 2 and a plurality of R 25 are mutually the same or different;
pf is 3 and a plurality of R 26 are mutually the same or different; and
each of R 21 to R 26 is bonded to a carbon atom of each of the aromatic rings.

14. The organic electroluminescence device according to claim 13 , wherein
R 21 to R 26 are hydrogen atoms.

15. The organic electroluminescence device according to claim 1 , wherein
the second compound is represented by a formula (22) below,

where: Ar 21 is a substituted or unsubstituted fused aromatic hydrocarbon group having 10 to 30 ring carbon atoms;
L 2 is a single bond or a linking group;
the linking group in L 2 is a substituted or unsubstituted aromatic hydrocarbon group having 6 to 30 ring carbon atoms, or a substituted or unsubstituted heterocyclic group having 5 to 30 ring atoms;
qx is an integer from 1 to 3 and a plurality of L 2 are mutually the same or different; and
qa is an integer from 1 to 4 and a plurality of group represented by a formula (22x) below bonded to Ar 21 are mutually the same or different,

16. The organic electroluminescence

Assignees

• Idemitsu Kosan Co

Inventors

• Nishimura Kazuki
• Saito Hiroyuki

Classifications

• H01L51/5004

  Electricity · mapped topic

• H01L51/5024

  Electricity · mapped topic

• H01L51/0054

  Electricity · mapped topic

• C09K11/025

  non-luminescent particle coatings or suspension media · CPC title

• C07C13/66 Primary

  the condensed ring system contains only four rings · CPC title