New Molecular Design Concurrently Providing Superior Pure Blue, Thermally Activated Delayed Fluorescence and Optical Out-Coupling Efficiencies

New Molecular Design Concurrently Providing Superior Pure Blue, Thermally Activated Delayed Fluorescence and Optical Out-Coupling Efficiencies

Simultaneous enhancement of out-coupling efficiency, internal quantum efficiency, and color purity in thermally activated delayed fluorescence (TADF) emitters is highly desired for the practical application of these materials. We designed and synthesized two isomeric TADF emitters, 2DPyM-mDTC and 3D...

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Veröffentlicht in:Journal of the American Chemical Society 2017-08, Vol.139 (32), p.10948-10951
Hauptverfasser: Rajamalli, P, Senthilkumar, N, Huang, P.-Y, Ren-Wu, C.-C, Lin, H.-W, Cheng, C.-H
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container_end_page 10951
container_issue 32
container_start_page 10948
container_title Journal of the American Chemical Society
container_volume 139
creator Rajamalli, P
Senthilkumar, N
Huang, P.-Y
Ren-Wu, C.-C
Lin, H.-W
Cheng, C.-H
description Simultaneous enhancement of out-coupling efficiency, internal quantum efficiency, and color purity in thermally activated delayed fluorescence (TADF) emitters is highly desired for the practical application of these materials. We designed and synthesized two isomeric TADF emitters, 2DPyM-mDTC and 3DPyM-pDTC, based on di­(pyridinyl)­methanone (DPyM) cores as the new electron-accepting units and di­(tert-butyl)­carbazole (DTC) as the electron-donating units. 3DPyM-pDTC, which is structurally nearly planar with a very small ΔE ST, shows higher color purity, horizontal ratio, and quantum yield than 2DPyM-mDTC, which has a more flexible structure. An electro­luminescence device based on 3DPyM-pDTC as the dopant emitter can reach an extremely high external quantum efficiency of 31.9% with a pure blue emission. This work also demonstrates a way to design materials with a high portion of horizontal molecular orientation to realize a highly efficient pure-blue device based on TADF emitters.
doi_str_mv 10.1021/jacs.7b03848
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title New Molecular Design Concurrently Providing Superior Pure Blue, Thermally Activated Delayed Fluorescence and Optical Out-Coupling Efficiencies
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