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- W2074008575 abstract "We examine various electronic processes that underlie the quenching of the emission from highly efficient phosphorescent and electrophosphorescent organic solid-state molecular systems. As an example, we study the luminescent efficiencies from the phosphorescent iridium (III) complex, fac tris (2-phenylpyridine) iridium $[mathrm{Ir}{(mathrm{ppy})}_{3}]$ doped into a diamine derivative doped polycarbonate hole-transporting matrix and in the form of vacuum-evaporated films, as a function of electric field. We demonstrate that the observed decrease in electrophosphorescence efficiencies at high electric fields, and electric-field-induced quenching of phosphorescence from neat $[mathrm{Ir}{(mathrm{ppy})}_{3}]$ solid films is due to the field-assisted dissociation of Coulombically correlated electron-hole (e-h) pairs. They are formed in a bimolecular recombination process prior to the formation of emissive triplet excitons, or are charge-transfer (CT) states originating from the localized electronic excited states as a result of the initial charge separation upon photoexcitation, respectively. It is found that the high-field dependence of the quenching efficiency in both cases follows the three-dimensional Onsager theory of geminate recombination, the fit yielding the initial intercarrier distance ${(r}_{0})$ of the carrier pairs. We find ${r}_{eensuremath{-}h}>~3.5mathrm{nm}$ for the triplet exciton precursor pairs in the bimolecular recombination, and ${r}_{mathrm{CT}}=1.8ifmmodepmelsetextpmfi{}0.1mathrm{nm}$ for the initial carrier separation from the photo-excited electronic states. Triplet-triplet and triplet-charge carrier annihilation processes are shown to play major roles in the decrease of the electrophosphorescence efficiency within the lower-field regime at lower current densities. Summarizing the results allows us to point out some emitter features important for identifying phosphors useful for practical electroluminescent devices." @default.
- W2074008575 created "2016-06-24" @default.
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- W2074008575 date "2002-12-31" @default.
- W2074008575 modified "2023-10-17" @default.
- W2074008575 title "Quenching effects in organic electrophosphorescence" @default.
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- W2074008575 doi "https://doi.org/10.1103/physrevb.66.235321" @default.
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