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Singlet energy transfer and singlet-singlet annihilation in light-emitting blends of organic semiconductors
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Excitation energy transfer from host to guest is studied in spin-cast blends of -bis(-carbazolyl)biphenyl (CBP) and a phosphorescent -tris(2-phenylpyridyl)iridium(III)-cored dendrimer using time resolved fluorescence. The kinetics of energy transfer are consistent with homogeneous dispersion of the dendrimers in the CBP host. Diffusion-controlled singlet-singlet exciton annihilation is observed in the CBP host at moderate excitation densities, similar to those encountered in high brightnesslight-emitting devices and organic lasers. The results are important for organic lighting and the understanding of excitondiffusion in guest-host systems for electrophosphorescence.
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