微腔有机电致发光器件角度依赖性的模拟与实验验证

Abstract

In order to analysize the angle dependence of the microcavity organic light emitting device( MOLED),both simulation research using transmission matrix method and experiment were carried out,based on microcavity principles and relative formations. The structure of the device was designed as Glass / DBR / ITO( 58 nm) / NPB( 46 nm) / DPVBi( 20 nm) / Alq3( 56 nm) /Li F( 1 nm) /Al( 150 nm). The experimental electro-luminescence( EL) spectrum shows that the luminescence peaks blue shift and weaken down with the increasing of the detection angle. Comparing with the simulated reflection spectrum under different detection angle,it is found that the transmission peaks of the reflection spectrum correspond to the EL peaks. Further simulation analysis shows that the two reflection mirrors in the microcavity tend to have different reflection rate and different reflection phase change for S and P polarization light under different detection angle. Meanwhile,the optical thickness of the organic layer in the microcavity also changes under different emitting angle,which induces a change in the effective length of the microcavity. The reasons above all lead to the changes of the EL spectrum.