Effect of horizontal molecular orientation on triplet-exciton diffusion in amorphous organic films
2012
Triplet harvesting is a candidate technology for highly efficient and long-life white OLEDs, where green or red
phosphorescent emitters are activated by the triplet-excitons diffused from blue fluorescent emitters. We examined two
oxadiazole-based electron transport materials with different horizontal molecular orientation as a triplet-exciton diffusion
layer (TDL) in triplet-harvesting OLEDs. The device characteristics and the transient electroluminescent analyses of the
red phosphorescent emitter showed that the triplet-exciton diffusion was more effective in the highly oriented TDL. The
results are ascribed to the strong orbital overlap between the oriented molecules, which provides rapid electron exchange
(Dexter energy transfer) in the TDL.
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