Patent ID: 6893743
Filing Date: 2005-05-17
Classification: H01L,Y10S

Abstract:
1. An organic electroluminescent device comprising a substrate having thereon a light-emitting layer sandwiched by an anode and a cathode, wherein said light-emitting layer comprises at least: (1) a host material having electron-transporting or hole-transporting property, (2) Compound A capable of phosphorescence emission at room temperature, and (3) Compound B capable of phosphorescence emission at room temperature and having the maximum light emission wavelength longer than the maximum light emission wavelength of Compound A, and the maximum light emission wavelength of said device is attributable to said (3), and wherein Compound A and Compound B are uniformly distributed within the light-emitting layer or are non-uniformly present by having a distribution in the layer thickness direction.