可弯曲式有机电致发光器件的出光率

Light Out-Coupling Efficiency in Flexible Organic Light-Emitting Devices

基于几何光学模型及其原理,推导出在不同弯曲情况下可弯曲式有机电致发光器件的出光率表达式,分析了器件出光率受基板曲率、厚度及有机层折射率的影响,并与平整有机电致发光器件的出光情况作了比较。结果表明:当器件向外弯曲时,出光率随着基板曲率与基板厚度的增大而增大,随着有机层折射率的增大而减小;当器件向内弯曲时,出光率随着基板曲率与基板厚度的增大而减小,随着有机层折射率的增大而减小。对于平整器件,其出光率随有机层折射率的增大而减小。

Based on the geometrical optics model,the expression of flexible organic light emitting devices （FOLED）′s out-coupling efficiency was presented. The influence of substrate curvature and its thickness,and organic layer′s refractive index on the performance of the FOLED′s out-coupling efficiency was studied,and the variation of out-coupling efficiency between FOLED and plane organic light emitting display （OLED） are contrasted as well. The result shows that：the out-coupling efficiency is enhanced with increased substrate curvature and its thickness,but is reduced with increased organic layer′s refractive index for outcurved substrate. The out-coupling efficiency is reduced with increased substrate curvature and thickness,and is also reduced with increased organic layer′s refractive index for incurvated substrate. The out-coupling efficiency of OLED is reduced with increased organic layer′s refractive index.