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

Pachaiyappan Rajamalli | Zendy; N. Senthilkumar | Zendy; Pei-Yun Huang | Zendy; ChenZheng RenWu | Zendy; HaoWu Lin | Zendy; ChienHong Cheng | Zendy

Open Access

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

Author(s) -

Pachaiyappan Rajamalli,

N. Senthilkumar,

Pei-Yun Huang,

ChenZheng RenWu,

HaoWu Lin,

ChienHong Cheng

Publication year - 2017

Publication title -

journal of the american chemical society

Language(s) - English

Resource type - Journals

SCImago Journal Rank - 7.115

H-Index - 612

eISSN - 1520-5126

pISSN - 0002-7863

DOI - 10.1021/jacs.7b03848

Subject(s) - electroluminescence , quantum yield , quantum efficiency , fluorescence , carbazole , common emitter , chemistry , coupling (piping) , dopant , planar , optoelectronics , photochemistry , electron , optics , materials science , organic chemistry , doping , physics , layer (electronics) , computer graphics (images) , quantum mechanics , computer science , metallurgy

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.

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