Suppressing molecular motions for enhanced room-temperature phosphorescence of metal-free organic materials

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Title
Suppressing molecular motions for enhanced room-temperature phosphorescence of metal-free organic materials
Author
Kwon, Min SangYu, YoungchangCaleb CoburnPhillips , Andrew W.Chung, KyeongwoonShanker, ApoorvJung, JaehunKim, Gun-HoPipe, KevinForrest, Stephen R.Youk, Ji HoGierschner, JohannesKim, Jinsang
Issue Date
2015-12
Publisher
NATURE PUBLISHING GROUP
Citation
NATURE COMMUNICATIONS, v.6, pp.8947
Abstract
Metal-free organic phosphorescent materials are attractive alternatives to the predominantly used organometallic phosphors but are generally dimmer and are relatively rare, as, without heavy-metal atoms, spin-orbit coupling is less efficient and phosphorescence usually cannot compete with radiationless relaxation processes. Here we present a general design rule and a method to effectively reduce radiationless transitions and hence greatly enhance phosphorescence efficiency of metal-free organic materials in a variety of amorphous polymer matrices, based on the restriction of molecular motions in the proximity of embedded phosphors. Covalent cross-linking between phosphors and polymer matrices via Diels-Alder click chemistry is devised as a method. A sharp increase in phosphorescence quantum efficiency is observed in a variety of polymer matrices with this method, which is ca. two to five times higher than that of phosphor-doped polymer systems having no such covalent linkage.
URI
https://scholarworks.unist.ac.kr/handle/201301/19205
URL
http://www.nature.com/ncomms/2015/151202/ncomms9947/full/ncomms9947.html
DOI
10.1038/ncomms9947
ISSN
2041-1723
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MSE_Journal Papers
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