Abstract
We report on carrier-transport, electroluminescence, and photoluminescence processes in a phosphorescent organic light-emitting device based on fac tris(2-phenylpyridine) iridium doped 4,4′-N,N′-dicarbazole-biphenyl over a wide temperature range from 5 to 295 K. The current flow could be described in terms of a space-charge-limited current with an exponential trap distribution at temperatures above 150 K. The electroluminescence intensity gradually decreased with decreasing temperature, whereas the photoluminescence intensity was almost independent of temperature. The difference between the temperature-dependent electroluminescence and photoluminescence intensities suggests that the carrier mobility depends on the electric field and the temperature.
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