Organic electroluminescence device
AssigneePioneer Electronic Corporation
InventorsShuzo Akiyama, Kenichiro Nakashima, Kunio Imai, Ryuji Murayama, Jun Funaki
Life of this patent
Estimating the term…
Abstract
An organic electroluminescent device comprises an anode, a positive-hole transport layer of organic compound, an emitting layer of organic compound, and a cathode which are laminated in sequence, wherein the emitting layer comprises a pyrimidopyrimidine derivative. This device emits with a high luminance and high emission efficiency.
Claims18
An organic electroluminescence device comprising an anode, a positive-hole transport layer of organic compound, an emitting layer of organic compound, and a cathode which are laminated in sequence, wherein said emitting layer comprises a pyrimidopyrimidine derivative represented by formula 1 ##STR26## where R.sub.l -R.sub.4 are independently hydrogen atom, halogen atom and functional groups represented by formula 2 ##STR27## where R.sub.5 and R.sub.6 are independently hydrogen atom, alkyl group, aryl group, or R.sub.5 and R.sub.6 taken together comprises the atoms or groups necessary to complete a cycloalkyl or heterocyclic ring.
An organic electroluminescence device comprising an anode, a positive-hole transport layer of organic compound, an emitting layer of organic compound, and a cathode which are laminated in sequence, wherein said emitting layer comprises a mixture of a pyrimidopyrimidine derivative as a fluorescent guest material and an organic host material having a large capability of transporting electrons, said pyrimidopyrimidine derivative being represented by formula 1 ##STR30## where R.sub.1 -R.sub.4 are independently a hydrogen atom, a halogen atom or a functional group represented by formula (2) ##STR31## where R.sub.5 and R.sub.6 are independently a hydrogen atom, an alkyl group, an aryl group, or R.sub.5 and R.sub.6 taken together comprise the atoms or groups necessary to complete a cycloalkyl or heterocyclic ring;
- said organic host material comprising a compound selected from the group consisting of 2-(4'-tert-Butylphenyl)-5-(biphenyl)-1,3,4-oxadiazole, tris(8-quinolinol) aluminum, bis(8-quinolinol) magnesium, bis(benzo{f}-8-quinolinol) zinc, bis(2-methyl-8-quinolinolate) aluminum oxide, tris(8-quinolinol) indium, tris(5-methyl-8-quinolinol)aluminum, 8-quinolinol lithium, tris(5-chloro-8-quinolinol) gallium, bis(5-chloro-8-quinolinol) calcium and poly[zinc(II)-bis(8-hydroxy-5-guinolinyl)methane.
Dependencies are inferred from the claim text.