Fluorene-Based Single-Chain Copolymers for Color-Stable White Light-Emitting Diodes

✍ Scribed by Mingliang Sun; Qiaoli Niu; Bin Du; Junbiao Peng; Wei Yang; Yong Cao

• Publisher: John Wiley and Sons
• Year: 2007
• Tongue: English
• Weight: 145 KB
• Volume: 208
• Category: Article
• ISSN: 1022-1352
• DOI: 10.1002/macp.200700016

✦ Synopsis

Abstract

Fluorene‐based single‐chain copolymers with a white light emitter consisting of a blue and an orange chromophore have been synthesized and their photophysical and electroluminescent properties are investigated. The experimental results suggest that only a relatively small fraction of the orange‐emitting units incorporated into the fluorene is needed to achieve efficient white light emission by controlled incomplete energy transfer. A device from a copolymer with 0.02% DDQ content showed the highest external quantum efficiency of 2.64% with a luminance efficiency of 4.06 cd · A^−1^ with CIE coordinates (0.28, 0.24). The EL emissions are extremely stable over a wide range of current densities.

magnified image