Patent ID: 9153790
Filing Date: 2015-10-06
Classification: C09B,H01L

Abstract:
1. An organic electroluminescence device comprising an anode, an emitting layer, an electron-transporting region and a cathode in sequential order, wherein the emitting layer contains a host and a dopant which gives fluorescent emission of which the main peak wavelength is 480 nm or less; the affinity Ad of the dopant is smaller than the affinity Ah of the host; the triplet energy E a blocking layer is provided in the electron-transporting region such that it is adjacent to the emitting layer, and the triplet energy E at an applied voltage which makes current efficiency (unit: cd/A) maximum, a luminous intensity derived from singlet excitons generated by collision of triplet excitons generated in the emitting layer is 30% or more of the total luminous intensity.