US 6,285,039 B1 · Organic electroluminescent device

Abstract

In an organic EL device, a light emitting layer contains a specific coumarin derivative, and a hole injecting and/or transporting layer contains a specific tetraaryldiamine derivative. Also a light emitting layer in the form of a mix layer contains a specific coumarin derivative, a specific quinacridone compound or a specific styryl amine compound. There are provided at least two light emitting layers including a light emitting layer of the mix layer type wherein at least two dopants are contained so that at least two luminescent species may emit light. There is obtained an organic EL device capable of high luminance and continuous light emission and ensuring reliability. Multi-color light emission becomes possible.

Claims32

Dependent claims

An organic electroluminescent device comprising

a light emitting layer containing a coumarin derivative of the following formula (I), and
a hole injecting and/or transporting layer containing a tetraaryldiamine derivative of the following formula (II),
wherein each of R1, R2, and R3, which maybe identical or different, is a hydrogen atom, cyano, carboxyl, alkyl, aryl, acyl, ester or heterocyclic group, or R1 to R3, taken together, may form a ring;
each of R4 and R7 is a hydrogen atom, alkyl or aryl group;
each of R5 and R6 is an alkyl or aryl group;
or R4 and R5, R5 and R6, and R6 and R7, taken together, may form a ring, and
wherein each of Ar1, Ar2, Ar3, and Ar4 is an aryl group, at least one of Ar1 to Ar4 is a polycyclic aryl group derived from a fused ring or ring cluster having at least two benzene rings;
each of R11 and R12 is an alkyl group;
each of p and q is 0 or an integer of 1 to 4;
each of R13 and R14 is an aryl group;
and each of r and s is 0 or an integer of 1 to 5.

8 more elements

An organic electroluminescent device comprising a light emitting layer in the form of a mix layer containing a hole injecting and transporting compound and an electron injecting and transporting compound, the mix layer being further doped with a coumarin derivative of the following formula (I), a quinacridone compound of the following formula (III) or a styryl amine compound of the following formula (IV) as a dopant,

wherein each of R1, R2, and R3, which may be identical or different, is a hydrogen atom, cyano, carboxyl, alkyl, aryl, acyl, ester or heterocyclic group, or R1 to R3, taken together, may form a ring;
each of R4 and R7 is a hydrogen atom, alkyl or aryl group;
each of R5 and R6 is an alkyl or aryl group;
or R4 and R5, R5 and R6, and R6 and R7, taken together, may form a ring,
wherein each of R21 and R22, which may be identical or different, is a hydrogen atom, alkyl or aryl group;
each of R23 and R24 is an alkyl or aryl group;
each of t and u is 0 or an integer of 1 to 4;
or adjacent R23 groups or R24 groups, taken together, may form a ring when t or u is at least 2,
wherein R31 is a hydrogen atom or aryl group;
each of R32 and R33, which may be identical or different, is a hydrogen atom, aryl or alkenyl group;
R34 is an arylamino or arylaminoaryl group;
and v is 0 or an integer of 1 to 5 and said hole injecting and transporting compound is an aromatic tertiary amine, and said electron injecting and transporting compound is a compound selected from the group consisting of metal complexes of 8-quinolinol or derivatives thereof, oxadiazol derivatives, perylene derivatives, pyridine derivatives, pyrimidine derivatives, quinoxaline derivatives, diphenylquinone derivatives, and nitro-substituted fluorene derivatives.

9 more elements

Dependencies are inferred from the claim text.

Organic electroluminescent device

Life of this patent

Organic electroluminescent device

Life of this patent

Abstract

Claims32