Ideal Molecular Design of Blue Thermally Activated Delayed Fluorescent Emitter for High Efficiency, Small Singlet–Triplet Energy Splitting, Low Efficiency Roll-Off, and Long Lifetime

Highly efficient thermally activated delayed fluorescent (TADF) emitters, 5-(2-(4,6-diphenyl-1,3,5-triazin-2-yl)­phenyl)-5H-benzofuro­[3,2-c]­carbazole (oBFCzTrz), 5-(3-(4,6-diphenyl-1,3,5-triazin-2-yl)­phenyl)-5H-benzofuro­[3,2-c]­carbazole (mBFCzTrz), and 5-(4-(4,6-diphenyl-1,3,5-triazin-2-yl)­phe...

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Bibliographic Details
Published in:ACS applied materials & interfaces 2016-09, Vol.8 (35), p.23190-23196
Main Authors: Lee, Dong Ryun, Choi, Jeong Min, Lee, Chil Won, Lee, Jun Yeob
Format: Article
Language:English
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Summary:Highly efficient thermally activated delayed fluorescent (TADF) emitters, 5-(2-(4,6-diphenyl-1,3,5-triazin-2-yl)­phenyl)-5H-benzofuro­[3,2-c]­carbazole (oBFCzTrz), 5-(3-(4,6-diphenyl-1,3,5-triazin-2-yl)­phenyl)-5H-benzofuro­[3,2-c]­carbazole (mBFCzTrz), and 5-(4-(4,6-diphenyl-1,3,5-triazin-2-yl)­phenyl)-5H-benzofuro­[3,2-c]­carbazole (pBFCzTrz), were synthesized to study the effects of ortho-, meta-, and para- linkages between donor and acceptor moieties. oBFCzTrz having ortho- linked donor and acceptor moieties showed smaller singlet–triplet energy gap, shorter excited state lifetime, and higher photoluminescence quantum yield than mBFCzTrz and pBFCzTrz which are interconnected by meta- and para- positions. The TADF device using oBFCzTrz as a blue emitter exhibited high external quantum efficiency over 20%, little efficiency roll-off, and long device lifetime.
ISSN:1944-8244
1944-8252
DOI:10.1021/acsami.6b05877