Red light emitting compounds based on 3D conjugated structure with intramolecular charge transfer

Fenglian Bai; Qingguo He; Wei Liu; Yi Zhou; Qingjiang Sun; Yongfan Li

doi:10.1117/12.767903

20 November 2007 Red light emitting compounds based on 3D conjugated structure with intramolecular charge transfer

Fenglian Bai, Qingguo He, Wei Liu, Yi Zhou, Qingjiang Sun, Yongfan Li

Proceedings Volume 6828, Light-Emitting Diode Materials and Devices II; 68280A (2007) https://doi.org/10.1117/12.767903
Event: Photonics Asia 2007, 2007, Beijing, China

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.

Citation Download Citation

Fenglian Bai, Qingguo He, Wei Liu, Yi Zhou, Qingjiang Sun, and Yongfan Li "Red light emitting compounds based on 3D conjugated structure with intramolecular charge transfer", Proc. SPIE 6828, Light-Emitting Diode Materials and Devices II, 68280A (20 November 2007); https://doi.org/10.1117/12.767903

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