Color-stable, ITO-free white organic light-emitting diodes with enhanced efficiency using solution-processed transparent electrodes and optical outcoupling layers

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• 作者：Hong-Wei Chang^a ; ^b ; ¹ ; Yong Hyun Kim^a ; ^c ; ¹ ; Jonghee Lee^a ; ^d ; Simone Hofmann^a ; Bjö ; rn Lü ; ssem^a ; Lars Mü ; ller-Meskamp^a ; Malte C. Gather^a ; ^e ; Karl Leo^a ; ^{karl.leo@iapp.de" class="auth_mail} ; Chung-Chih Wu^b ; ^{chungwu@cc.ee.ntu.edu.tw" class="auth_mail}
• 关键词：OLEDs ; Transparent electrode ; Conducting polymer ; Optical outcoupling
• 刊名：Organic Electronics
• 出版年：May, 2014
• 年：2014
• 卷：15
• 期：5
• 页码：1028-1034
• 全文大小：1444 K

文摘

In this work, we demonstrate color-stable, ITO-free white organic light-emitting diodes (WOLEDs) with enhanced efficiencies by combining the high-conductivity conducting polymer PEDOT:PSS as transparent electrode and a nanoparticle-based scattering layer (NPSL) as the effective optical out-coupling layer. In addition to efficiency enhancement, the NPSL is also beneficial to the stabilization of electroluminescent spectra/colors over viewing angles. Both the PEDOT:PSS and the NPSL can be fabricated by simple, low-temperature solution processing. The integration of both solution-processable transparent electrodes and light extraction structures into OLEDs is particularly attractive for applications since they simultaneously provide manufacturing, cost and efficiency advantages.