Dimer with Thermally Activated Delayed Fluorescence (TADF) Emission in Non-Doped Device

2021 ◽  
Author(s):  
Xing Chen ◽  
Aziz Khan Mohmand ◽  
Sheng-Nan Zou ◽  
Yun Li ◽  
Qi-Sheng Tian ◽  
...  
Keyword(s):  
Charge Transfer ◽  
Space Charge ◽  
Delayed Fluorescence ◽  
Thermally Activated Delayed Fluorescence ◽  
Thermally Activated ◽  
Bond Charge

Two novel TADF molecules, with Donor#1-σ-Donor#2-π-Acceptor (D1-σ-D2-π-A) conformation, were designed and synthesized through-bond charge transfer (TBCT) and through-space charge transfer (TSCT). These two materials differ only from the D1 groups...

scholarly journals Through-space charge transfer hexaarylbenzene dendrimers with thermally activated delayed fluorescence and aggregation-induced emission for efficient solution-processed OLEDs

2019 ◽  
Vol 10 (10) ◽  
pp. 2915-2923 ◽  
Author(s):  
Xingdong Wang ◽  
Shumeng Wang ◽  
Jianhong Lv ◽  
Shiyang Shao ◽  
Lixiang Wang ◽  
...  
Keyword(s):  
Charge Transfer ◽  
Space Charge ◽  
Efficient Solution ◽  
Delayed Fluorescence ◽  
Electron Donors ◽  
Solution Processed ◽  
Thermally Activated Delayed Fluorescence ◽  
Aggregation Induced Emission ◽  
Thermally Activated

Through-space charge transfer hexaarylbenzene dendrimers containing circularly-arrayed electron donors and acceptors exhibit thermally activated delayed fluorescence and aggregation-induced emission effects, giving EQE of 14.2% for solution-processed OLEDs.

Through-Space Charge Transfer Dendrimers Employing Oxygen-Bridged Triarylboron Acceptors for Efficient Deep-Blue Electroluminescence

2021 ◽  
Author(s):  
Baoyun Du ◽  
Xingdong Wang ◽  
Fan Chen ◽  
Qingqing Yang ◽  
Shiyang Shao ◽  
...  
Keyword(s):  
Charge Transfer ◽  
Space Charge ◽  
Quantum Efficiency ◽  
External Quantum Efficiency ◽  
State Of The Art ◽  
Delayed Fluorescence ◽  
Thermally Activated Delayed Fluorescence ◽  
Thermally Activated ◽  
Deep Blue

Though-space charge transfer dendrimers consisting of dendritic triacridan donors and oxygen-bridged triarylboron acceptors are demonstrated to exhibit deep-blue thermally activated delayed fluorescence with state-of-the-art external quantum efficiency of 14.6% for...

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.

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