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.
|Number of pages||2|
|Journal||Japanese Journal of Applied Physics, Part 1: Regular Papers and Short Notes and Review Papers|
|Issue number||11 A|
|Publication status||Published - Nov 1 2004|
All Science Journal Classification (ASJC) codes
- Physics and Astronomy(all)