Red light emitting compounds based on 3D conjugated structure with intramolecular charge transfer
2007
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 CH 2 Cl 2 . 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/m 2 , 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.
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