微腔有机电致发光器件的谐振腔反射镜性能

Performance of Resonant Cavity Mirrors of Microcavity Organic Light-emitting Device

根据微腔原理运用传输矩阵法对构成微腔有机电致发光器件（MOLED）谐振腔的两个反射镜进行模拟计算并比较,可观察到：随金属反射镜的反射率增大,微腔器件的电致发光（PL）谱的半峰全宽（FWHM）逐渐窄化;峰值逐渐蓝移至设计的谐振峰值520nm处;峰值强度和光谱积分强度逐渐增强。结果表明：金属反射镜反射率越大越好。随DBR反射镜的周期数从1增加到9,EL的峰值均为520nm,半峰全宽逐渐窄化,积分强度逐渐减弱;峰值强度由弱增强再减弱,4个周期时峰值强度最大,所以设计微腔器件时,DBR的周期是一项很重要的参数。DBR反射率太大不利于出光,太小微腔效应小。需要根据制作目的和需要进行合理选择。

According to the related calculation formula of microcavity device,we use transfer matrix method to simulate and compare with two mirrors which form the resonant cavity of microcavity organic light-emitting device （MOLED）.We observed that,as metal mirror＇s reflectivity increases,electroluminescence （EL） and full wavelength of half maximum （FWHM） of microcavity device become narrow,peak position moves to the designed resonant peak of 520 nm,peak intensity and EL integral intensity increases gradually.The result shows that the bigger the metal mirror＇s reflectivity is,the better the result is.As the periodicity of DBR mirror increases in 1 ～ 9,peaks of EL are all 520 nm,FWHM narrows gradually,integral intensity decreases gradually,peak intensity increases at first then it decreases,and at 4 periodicities it is the biggest.So,when we design MOLED,the periodicity of DBR is an important parameter.It isn＇t good for light emitting if the reflectivity of DBR is bigger and the effect of microcavity is smaller if the reflectivity is smaller.We must make a resonable choice according to the purpose and need.