Patent ID: 7579772
Filing Date: 2009-08-25
Classification: H01L,Y10S

Abstract:
1. An organic electroluminescent display device, comprising: a substrate; a first electrode formed on the substrate; an organic layer formed on the first electrode, the organic layer containing at least one light emitting layer, the light emitting layer comprising at least one phosphorescent dopant and at least two host materials including a first host material having a hole transporting characteristic and a second host material being capable of suppressing crystallization of the first host material and having an electron transporting characteristic, the first host material being at least one selected from the group consisting of carbazoles, arylamines, hydrazones and starbursts, the second host material being at least one selected from the group consisting of an organic metal, oxadiazoles, triazoles, triazines and spirofluorenes, the first host material and the second host material are mixed at weight ratio of 1:0.1 to 1:10; and a second electrode formed on the organic layer.