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Degradation of blue-phosphorescent organic light-emitting devices involves exciton-induced generation of polaron pair within emitting layers

Title
Degradation of blue-phosphorescent organic light-emitting devices involves exciton-induced generation of polaron pair within emitting layers
Authors
Kim S.Bae H.J.Park S.Kim W.Kim J.Kim J.S.Jung Y.Sul S.Ihn S.-G.Noh C.You Y.
Ewha Authors
유영민
SCOPUS Author ID
유영민scopus
Issue Date
2018
Journal Title
Nature Communications
ISSN
2041-1723JCR Link
Citation
Nature Communications vol. 9, no. 1
Publisher
Nature Publishing Group
Indexed
SCI; SCIE; SCOPUS WOS scopus
Document Type
Article
Abstract
Degradation of organic materials is responsible for the short operation lifetimes of organic light-emitting devices, but the mechanism by which such degradation is initiated has yet to be fully established. Here we report a new mechanism for degradation of emitting layers in blue-phosphorescent devices. We investigate binary mixtures of a wide bandgap host and a series of novel Ir(III) complex dopants having N-heterocyclocarbenic ligands. Our mechanistic study reveals the charge-neutral generation of polaron pairs (radical ion pairs) by electron transfer from the dopant to host excitons. Annihilation of the radical ion pair occurs by charge recombination, with such annihilation competing with bond scission. Device lifetime correlates linearly with the rate constant for the annihilation of the radical ion pair. Our findings demonstrate the importance of controlling exciton-induced electron transfer, and provide novel strategies to design materials for long-lifetime blue electrophosphorescence devices. © 2018 The Author(s).
DOI
10.1038/s41467-018-03602-4
Appears in Collections:
엘텍공과대학 > 화학신소재공학전공 > Journal papers
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