Zhang Chun-Yu, Lu Jing-Bin, Wang Cheng, Wang Hong-Jie
School of Materials Science and Engineering, Jilin Architectural and Civil Engineering Institute, Changchun 130118, China.
Guang Pu Xue Yu Guang Pu Fen Xi. 2011 Jan;31(1):47-50.
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 lambda/2 and lambda, 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 lambda/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 lambda 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.
微腔的谐振腔长度直接影响微腔有机发光器件（MOLED）的发光特性。根据微腔器件的相关计算公式，当微腔长度为λ/2和λ时，作者采用转移矩阵法进行模拟，并比较了激子在微腔不同位置时复合发光EL的函数。作者发现，当微腔长度为λ/2时，发光光谱的峰值均位于520nm，半高宽均为17nm。当激子位于微腔中心区域时，峰值强度和积分强度最大。当微腔长度为λ且激子位于微腔不同位置时，发光光谱的峰值均位于设计中心波长520nm，半高宽均为12nm。当激子位于微腔中心区域时，峰值强度和积分强度最小。经过分析，作者发现当激子位于电场的最大位置时，发光特性最佳。这是因为两种长度的微腔内电场强度分布不同。这表明，如果要制造高效的MOLED，就应该区分不同的谐振腔长度以及微腔内电场最大位置处的激子。
