We report highly efficient, simultaneous fluorescence and phosphorescence (74% yield) at room temperature from a single molecule ensemble of (BzP)PB [N,N′-bis(4-benzoyl-phenyl)-N,N′-diphenyl-benzidine] dispersed into a polymer host. The slow phosphorescence (208 ms lifetime) is very efficient (50%) at room temperature and only possible because the non-radiative rate for the triplet state is extremely low (2.4 × 100 s−1). The ability of an organic molecule to function as an efficient dual state emitter at room temperature is unusual and enables a wide range of applications including the use as broadband down-conversion emitters, optical sensors and attenuators, exciton probes, and spin-independent intermediates for Förster resonant energy transfer.
Highly efficient, dual state emission from an organic semiconductor
Sebastian Reineke, Nico Seidler, Shane R. Yost, Ferry Prins, William A. Tisdale, Marc A. Baldo; Highly efficient, dual state emission from an organic semiconductor. Appl. Phys. Lett. 26 August 2013; 103 (9): 093302. https://doi.org/10.1063/1.4819444
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