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We report highly efficient, simultaneous fluorescence and phosphorescence(74% yield) at room temperature from a single molecule ensemble of (BzP)PBdispersed into a polymer host. The slow phosphorescence (208 ms lifetime) isvery efficient (50%) at room temperature and only possible because thenon-radiative rate for the triplet state is extremely low. The ability of anorganic molecule to function as an efficient dual state emitter at roomtemperature is unusual and opens new fields of applications including the useas broadband down-conversion emitters, optical sensors and attenuators, excitonprobes, and spin-independent intermediates for F\"orster resonant energytransfer.

Highly efficient, dual state emission from an organic semiconductor