Exciton diffusion in organic films is crucial phenomenon in optoelectronic devices such as organic light-emitting diodes and organic photovoltaics. However, diffusion of exciplexes has not been actively studied despite their… Click to show full abstract
Exciton diffusion in organic films is crucial phenomenon in optoelectronic devices such as organic light-emitting diodes and organic photovoltaics. However, diffusion of exciplexes has not been actively studied despite their ever-growing importance in such devices due to the lack of apparent charge-transfer absorption, resulting in the absence of energy transfer (ET) to exciplex-forming pairs. Here, the ET from exciplexes to exciplex-forming pairs is reported by analysis of transient photo-luminescent profiles. Recent reports and our own observation of the sub-bandgap charge-transfer absorption in exciplex-forming systems support the ET from exciplexes to exciplex-forming pairs. The ET mechanism is discussed in the following paper.
               
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