Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Diffusion of exciplex. 1. Energy transfer from exciplex to
  exciplex-forming pair   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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The categories of this paper are: mtrl-th
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The categories of this paper are: nlin
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The categories of this paper are: plasm-ph
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The categories of this paper are: hep-lat
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The categories of this paper are: chao-dyn
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The categories of this paper are: cs
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The categories of this paper are: funct-an
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The categories of this paper are: solv-int
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The categories of this paper are: chem-ph
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The categories of this paper are: stat
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The categories of this paper are: dg-ga
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The categories of this paper are: gr-qc
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The categories of this paper are: atom-ph
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The categories of this paper are: q-bio
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The categories of this paper are: q-fin
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The categories of this paper are: econ