We accurately measured the absolute photoluminescence (PL) quantum efficiency (ηPL) of organic solid-state thin films using an integrating sphere. We particularly measured the ηPL of conventional organic materials used in organic light emitting diodes, such as a tris(8-quinolionolato) aluminum(III) complex (Alq3), and a 2 wt%-/fac-tris(2-phenylpyridyl) iridium(III): 4,4′-bis(carbazol-9-yl)-2,2′-biphenyl [Ir(ppy) 3:CBP] co-deposited film. Alq3 and Ir(ppy)3:CBP showed a ηPL = 20 ± 1% and 97 ± 2%, which corresponded well to external electroluminescence efficiency using these materials. We also measured their transient PL decay and determined the radiative rate constants with their ηPL.
All Science Journal Classification (ASJC) codes
- Physics and Astronomy(all)