Singlet energy transfer and singlet-singlet annihilation in light-emitting blends of organic semiconductors

Ruseckas, A.; Ribierre, J. C.; Shaw, P. E.; Staton, S. V.; Burn, P. L.; Samuel, I. D. W.
November 2009
Applied Physics Letters;11/2/2009, Vol. 95 Issue 18, p183305
Academic Journal
Excitation energy transfer from host to guest is studied in spin-cast blends of 4,4′-bis(N-carbazolyl)biphenyl (CBP) and a phosphorescent fac-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 brightness light-emitting devices and organic lasers. The results are important for organic lighting and the understanding of exciton diffusion in guest-host systems for electrophosphorescence.


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