White-Light-Emitting Diodes from Single Polymer Systems Based on Polyfluorene Copolymers with Quinoxaline Derivatives

详细信息    查看全文

• 作者：Po-I Lee ; Steve Lien-Chung Hsu ; Piyun Lin
• 刊名：Macromolecules
• 出版年：2010
• 出版时间：October 12, 2010
• 年：2010
• 卷：43
• 期：19
• 页码：8051-8057
• 全文大小：961K
• 年卷期：v.43,no.19(October 12, 2010)
• ISSN：1520-5835

文摘

White polymeric light-emitting diodes (WPLEDs) from a single polymer system were developed by incorporating 2,3-bis(4-methyloxyphenyl)quinoxaline and 5,8-bis(N,N-diphenylamino)-2,3-bis(4-methyloxyphenyl)quinoxaline into poly(9,9-dioctylfluorene). All copolymers showed good thermal stability with 5% weight loss temperatures above 420 °C, and glass transition temperatures ranged from 86 to 143 °C. Electroluminescence (EL) devices with indium tin oxide/poly(3,4-ethylenedioxythiophene):poly(styrenesulfonic acid)/emission layer/Ca/Ag were found to emit white light with Commission Internationale de l’Eclairage (CIE) coordinates of (0.33, 0.40) and (0.30, 0.36). These devices exhibit a highest brightness of 12300 cd/m² and a maximum current efficiency of 2.56 cd/A.