Journal
SOLID-STATE ELECTRONICS
Volume 56, Issue 1, Pages 196-200Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.sse.2010.10.018
Keywords
Organic light-emitting diodes; Transient luminescence; Carrier trapping; Carrier mobility
Funding
- US Department of Energy [DE-FC26-06NT 42859]
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Transient electroluminescence (EL) was used to measure the delay between the excitation pulse and onset of emission in OLEDs based on phosphorescent bis[3,5-bis(2-pyridyl)-1,2,4-triazolato] platinum(11) doped into 4,4'-bis(carbazol-9-yl) triphenylamine (CBP), from which an electron mobility of 3.2 x 10(-6) cm(2)/V s was approximated. Delayed recombination was observed after the drive pulse had been removed and based on its dependence on frequency and duty cycle, ascribed to trapping and de-trapping processes associated with disorder-induced carrier localization at the interface between the emissive layer and electron blocker. The data suggests that the exciton recombination zone is at, or close to the interface between the emissive layer and electron blocker. Despite the charge trapping effects, a peak power efficiency of 24 lm/W and peak external quantum efficiency of 10.64% were obtained. Mechanisms for the electroluminescence and delayed recombination are proposed. (C) 2010 Elsevier Ltd. All rights reserved.
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