Nonconjugated Triptycene-Spaced Donor–Acceptor-Type Emitters Showing Thermally Activated Delayed Fluorescence via Both Intra- and Intermolecular Charge-Transfer Transitions

2021 ◽  
Author(s):  
Gaole Dai ◽  
Ming Zhang ◽  
Kai Wang ◽  
Xiaochun Fan ◽  
Yizhong Shi ◽  
...  
Keyword(s):  
Charge Transfer ◽  
Delayed Fluorescence ◽  
Thermally Activated Delayed Fluorescence ◽  
Thermally Activated ◽  
Intermolecular Charge Transfer ◽  
Charge Transfer Transitions ◽  
Donor Acceptor

scholarly journals Synthesis and optoelectronic properties of benzoquinone-based donor–acceptor compounds

2019 ◽  
Vol 15 ◽  
pp. 2914-2921
Author(s):  
Daniel R Sutherland ◽  
Nidhi Sharma ◽  
Georgina M Rosair ◽  
Ifor D W Samuel ◽  
Ai-Lan Lee ◽  
...  
Keyword(s):  
Charge Transfer ◽  
Delayed Fluorescence ◽  
Optoelectronic Properties ◽  
Donor Group ◽  
Thermally Activated Delayed Fluorescence ◽  
Thermally Activated ◽  
Palladium Catalyzed ◽  
Donor Acceptor

Herein, we report a mild and efficient palladium-catalyzed C–H functionalization method to synthesize a series of benzoquinone (BQ)-based charge-transfer (CT) derivatives in good yields. The optoelectronic properties of these compounds were explored both theoretically and experimentally and correlations to their structures were identified as a function of the nature and position of the donor group (meta and para) attached to the benzoquinone acceptor. Compound 3, where benzoquinone is para-conjugated to the diphenylamine donor group, exhibited thermally activated delayed fluorescence (TADF) with a biexponential lifetime characterized by a prompt ns component and a delayed component of 353 μs.

Charge-transfer transition regulation of thermally activated delayed fluorescence emitters by changing the valence of sulfur atoms

2020 ◽  
Vol 8 (48) ◽  
pp. 17457-17463
Author(s):  
Xiang Zhang ◽  
Jia-Xiong Chen ◽  
Kai Wang ◽  
Yi-Zhong Shi ◽  
Xiao-Chun Fan ◽  
...  
Keyword(s):  
Charge Transfer ◽  
Sulfur Atom ◽  
Delayed Fluorescence ◽  
Charge Transfer Transition ◽  
Thermally Activated Delayed Fluorescence ◽  
Thermally Activated ◽  
Charge Transfer Transitions

Changing the valence of a sulfur atom to form two novel thermally activated delayed fluorescence emitters with different charge transfer transitions.

scholarly journals Optical and Polarity Control of Donor–Acceptor Conformation and Their Charge-Transfer States in Thermally Activated Delayed-Fluorescence Molecules

2017 ◽  
Vol 121 (30) ◽  
pp. 16462-16469 ◽  
Author(s):  
Paloma L. dos Santos ◽  
Jonathan S. Ward ◽  
Andrei S. Batsanov ◽  
Martin R. Bryce ◽  
Andrew P. Monkman
Keyword(s):  
Charge Transfer ◽  
Delayed Fluorescence ◽  
Thermally Activated Delayed Fluorescence ◽  
Thermally Activated ◽  
Donor Acceptor

scholarly journals Intramolecular Through-Space Charge-Transfer Emitters Featuring Thermally Activated Delayed Fluorescence for High-Efficiency Electroluminescent Devices

2021 ◽  
Author(s):  
Yongjun song ◽  
lei he ◽  
Mingxing Tian ◽  
Renyou Yu
Keyword(s):  
Charge Transfer ◽  
Space Charge ◽  
High Efficiency ◽  
Theoretical Calculations ◽  
Delayed Fluorescence ◽  
Thermally Activated Delayed Fluorescence ◽  
Light Emitting ◽  
Thermally Activated ◽  
Donor Acceptor ◽  
First Time

Through-space charge-transfer (TSCT) emitters have been extensively explored for thermally activated delayed fluorescence (TADF), but arranging various donors and acceptors into rigid cofacial conformations for various efficient TSCT TADF emitters has still remained a challenge. Here we report for the first time a “fixing acceptor” design to reach various efficient TSCT TADF emitters. By chemically fixing the acceptor (benzophenone) with a rigid spiro structure and cofacially aligning various donors with the fixed acceptor, a series of efficient TSCT TADF emitters have been developed. Single-crystal structures and theoretical calculations have verified closely-packed cofacial donor/acceptor conformations and favorable TSCT in the emitters. The emitters afford sky-blue to yellow TADF emission in doped films, with high photoluminescent efficiencies of up to 0.92 and reverse intersystem crossing rates of up to 1.0×106 s−1. Organic light-emitting diodes using the emitters afford sky-blue to yellow electroluminescence with high external quantum efficiencies of up to 20.9%. The work opens a new avenue toward a wide variety of efficient TSCT TADF emitters.

Near-infrared-II thermally activated delayed fluorescence organic light-emitting diodes

2020 ◽  
Vol 56 (63) ◽  
pp. 8988-8991
Author(s):  
Qingxin Liang ◽  
Jingyi Xu ◽  
Jie Xue ◽  
Juan Qiao
Keyword(s):  
Charge Transfer ◽  
Near Infrared ◽  
Light Emitting Diodes ◽  
Delayed Fluorescence ◽  
Organic Light Emitting Diodes ◽  
Thermally Activated Delayed Fluorescence ◽  
Light Emitting ◽  
Thermally Activated ◽  
Organic Light ◽  
Intermolecular Charge Transfer

The first thermally activated delayed fluorescence emitter and organic light-emitting diodes in the near-infrared II region were realized via intermolecular charge-transfer aggregates.

scholarly journals The interplay of thermally activated delayed fluorescence (TADF) and room temperature organic phosphorescence in sterically-constrained donor–acceptor charge-transfer molecules

2016 ◽  
Vol 52 (12) ◽  
pp. 2612-2615 ◽  
Author(s):  
Jonathan S. Ward ◽  
Roberto S. Nobuyasu ◽  
Andrei S. Batsanov ◽  
Przemyslaw Data ◽  
Andrew P. Monkman ◽  
...  
Keyword(s):  
Charge Transfer ◽  
Room Temperature ◽  
Delayed Fluorescence ◽  
Molecular Engineering ◽  
Thermally Activated Delayed Fluorescence ◽  
Thermally Activated ◽  
Donor Acceptor

Molecular engineering of phenothiazine–dibenzothiophene-S,S-dioxide molecules is reported.

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