Directed emissive high efficient white transparent organic light emitting diodes with double layered capping layers

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• 作者：Jin Woo Huh ; Jaehyun Moon ; Joo Won Lee ; Doo-Hee Cho ; Jin-Wook Shin ; Jun-Han Han ; Joohyun Hwang ; Chul Woong Joo ; Hye Yong Chu ; Jeong-Ik Lee ; ^{jiklee@etri.re.kr}
• 关键词：Transparent organic light-emitting diodes ; Capping layer ; Directed emission ; High efficiency ; Spectra matching
• 刊名：Organic Electronics
• 出版年：2012
• 期刊代码：137_15661199
• 类别：et
• 出版时间：August, 2012
• 卷：13
• 期：8
• 页码：1386-1391
• 文件大小：822 K

摘要

We report on white transparent organic light emitting diode (TOLED) with double layered capping layer (CL), 1,1-bis[(di-4-tolylamino)phenyl]cyclohexane (TAPC) and ZnSe. By introducing the double layered CL, total efficiency was improved by 27%to have 90%of that of conventional bottom-emissive device. The achievement of highly improved efficiency was interpreted as the synergetic effect of constructive interference and maximized reflectance of CL. By adjusting the reflectance of the CL, it was possible to choose the emissions direction selectively and achieve spectral matching between top and bottom emissions as well as enhanced total efficiency in white TOLED.