Blue organic electrophosphorescence using exothermic host–guest energy transfer

Holmes, R. J.; Forrest, S. R.; Tung, Y.-J.; Kwong, R. C.; Brown, J. J.; Garon, S.; Thompson, M. E.
April 2003
Applied Physics Letters;4/14/2003, Vol. 82 Issue 15, p2422
Academic Journal
We demonstrate efficient blue electrophosphorescence using exothermic energy transfer from a host consisting of N,N'-dicarbazolyl-3,5-benzene (mCP) to the phosphorescent iridium complex iridium(III)bis[(4,6-difluorophenyl)-pyridinato-N,C[sup 2']picolinate (Flrpic). By examining the temperature dependence of the radiative lifetime and the photoluminescence of a film of mCP doped with Flrpic, we confirm the existence of exothermic energy transfer in contrast to the endothermic transfer characteristic of the N,N'-dicarbazolyl-4-4'-biphenyl and Flrpic system. In employing exothermic energy transfer between mCP and Flrpic, a maximum external electroluminescent quantum efficiency of (7.5±0.8)% and a luminous power efficiency of (8.9±0.9)lm/W are obtained, representing a significant increase in performance over previous endothermic blue electrophosphorescent devices.


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