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

A. Ruseckas, J. C. Ribierre, P. E. Shaw, S. V. Staton, P. L. Burn, I. D. W. Samuel

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16 Citations (Scopus)

Abstract

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.

Original languageEnglish
Article number183305
Number of pages3
JournalApplied Physics Letters
Volume95
Issue number18
DOIs
Publication statusPublished - 2 Nov 2009

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