Simple Accurate System for Measuring Absolute Photoluminescence Quantum Efficiency in Organic Solid-State Thin Films

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We accurately measured the absolute photoluminescence (PL) quantum efficiency ($\eta_{\text{PL}}$) of organic solid-state thin films using an integrating sphere. We particularly measured the $\eta_{\text{PL}}$ 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 $\eta_{\text{PL}}=20\pm 1$% and $97\pm 2$%, 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 $\eta_{\text{PL}}$.
2004-11-15