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.
All Science Journal Classification (ASJC) codes
- Physics and Astronomy (miscellaneous)