两种谐振腔长度的微腔有机电致发光器件模拟

Simulation of Microcavity Organic Light Emitting Device with Two Kinds of Resonant Cavity Lengths

微腔的谐振腔长度直接影响微腔有机电致发光器件(MOLED)的发光特性,根据微腔器件的相关计算公式运用传输矩阵法,分别对微腔长度L=λ/2和L=λ(λ:中心波长)时,在微腔内不同位置激子复合发光的电致发光谱(EL)进行模拟计算和比较。发现:微腔长度为L=λ/2时,峰值均为520nm,半峰全宽均为17nm,激子处在微腔的中心位置时,峰值强度和积分强度均为最大。L=λ时,激子在腔内不同位置时,峰值均为520nm,半峰全宽均12nm,在腔的中心区域时,与L=λ/2时正好相反,峰值强度和积分强度最小。分析后判断是因为两种长度的微腔内电场强度分布不同,激子位于腔内电场的最大值处发光性能最好。说明要制作出高效率的MOLED,要区别不同谐振腔长度,并使激子处于腔内电场最大处。

The resonant cavity length of microcavity influences the light emitting characteristics of microcavity organic light emitting device（MOLED） directly.According to the related calculation formula of microcavity device,when the lengths of microcavity are λ/2 and λ,the authors use transfer matrix method to simulate and compare with the functions of composite light emitting EL when exciton is in different positions of microcavity.The authors found that when the length of microcavity is λ/2,the peaks of luminous spectrum are all at the 520 nm,and the width of half-peaks are all 17 nm.The peak intensity and integral intensity are biggest when exciton is in the central area of microcavity.When the length of microcavity is λ and exciton is at different positions of microcavity,the peaks of luminous spectrum are all at the 520 nm of designed center wavelength,and the widths of half-peaks are all 12 nm.The peak intensity and integral intensity are smallest when exciton is in the central area of microcavity.After analyzing,The authors found that the light emitting characteristics is best when the exciton is at the maximum position of the electric field.This is because the electric field＇s intensities in the microcavity with two kinds of lengths are distributed differently.It illustrates that one should distinguish different resonant cavity length and exciton at the maximum position of the electric field within microcavity if one wants to create an efficient MOLED.