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Proceedings Paper

Red light emitting compounds based on 3D conjugated structure with intramolecular charge transfer
Author(s): Fenglian Bai; Qingguo He; Wei Liu; Yi Zhou; Qingjiang Sun; Yongfan Li
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Paper Abstract

A starburst molecule (T) with triphenylamine (TPA) and benzothiodiazole (BTD) as constructing units was synthesized via two step Heck coupling reaction. As compared with its linear counterpart, it shows better solubility and amorphous film-forming ability. Spectroscopic properties show that it emits red light with emission peak at 651 nm in CH2Cl2. The red light emitting arises from the intramoleculasr charger transfer state. White light emitting diode (WLED) was fabricated with the starburst molecule as red light emitting composite. The luminance and efficiency maximum was 3960 cd/m2, and 1.22 cd/A for the WLED device with only 0.05%.(W/W) doping content of the light emitting composite. The high performance of WLED is attributed to the high chromorphore density and electron coupling effect of multi-branches. It is reasonable to conclude that starburst structure is superior to its linear and less branch counterparts in the fabrication of LED devices.

Paper Details

Date Published: 20 November 2007
PDF: 7 pages
Proc. SPIE 6828, Light-Emitting Diode Materials and Devices II, 68280A (20 November 2007); doi: 10.1117/12.767903
Show Author Affiliations
Fenglian Bai, Institute of Chemistry (China)
Qingguo He, Shanghai Institute of Microsystem and Information Technology (China)
Wei Liu, Institute of Chemistry (China)
Yi Zhou, Institute of Chemistry (China)
Qingjiang Sun, Institute of Chemistry (China)
Yongfan Li, Institute of Chemistry (China)

Published in SPIE Proceedings Vol. 6828:
Light-Emitting Diode Materials and Devices II
Jian Wang; Changhee Lee; Hezhou Wang, Editor(s)

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