Journal
ADVANCED MATERIALS
Volume 23, Issue 45, Pages 5370-+Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/adma.201102294
Keywords
organic semiconductors; photoluminescence; exciton; singlet; triplet; fission; fusion
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Funding
- American Chemical Society [PRF DNI 50629-DNI10]
- National Science Foundation [NSF-DMR-0843985]
- Division Of Materials Research
- Direct For Mathematical & Physical Scien [0843985] Funding Source: National Science Foundation
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Commonly observed variations in photoluminescence (PL) spectra of crystalline organic semiconductors, including the appearance or enhancement of certain PL bands, are shown to originate from a small amount of structural disorder (e.g., amorphous inclusions embedded in a crystal), rather than be necessarily related to chemical impurities or material oxidation. For instance, in rubrene, a minute amount of such disorder can lead to the appearance of a dominant PL band at 650 nm as a result of triplet excitons captured and fused at these sites, with a subsequent emission from the amorphous phase.
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