A linear-shaped phosphorescent platinum(II) complex that adopts a horizontal orientation in amorphous films was synthesized. The complex possesses a photoluminescence quantum efficiency of Φ PL = 50±3% in thin films with the host of m -biscarbazolylbenzene and 4,4'-bis( N -carbazolyl)biphenyl. Polarized emission from the edge of these thin films confirmed the horizontal orientation of the complex within them. An organic light-emitting diode containing the complex possessed a maximum external quantum efficiency of η EQE = 15.8±3%. The light out-coupling efficiency of the device was estimated to be at least Φ out = 32±3%, which was ascribed to the horizontal orientation of the complex.
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Taneda et al. (2011) studied this question.