Acridin-9(10H)-one based thermally activated delayed fluorescence material: simultaneous optimization of RISC and radiation processes to boost luminescence efficiency

2021 ◽  
Author(s):  
Yongqiang Mei ◽  
Di Liu ◽  
Jiuyan Li ◽  
Huiting Li ◽  
Wenkui Wei
Keyword(s):  
Rate Constants ◽  
Delayed Fluorescence ◽  
Simultaneous Optimization ◽  
High Radiation ◽  
Thermally Activated Delayed Fluorescence ◽  
Thermally Activated ◽  
Luminescence Efficiency ◽  
Molecular Rigidity ◽  
Radiation Processes ◽  
Fluorescence Material

The high radiation and RISC rate constants were achieved simultaneously for a TADF emitter with acridin-9(10H)-one as acceptor due to high molecular rigidity and multichannel RISC processes, OLED with this TADF emitter exhibits a high EQE of 30.6%.

scholarly journals Exact Solution of Kinetic Analysis for Thermally Activated Delayed Fluorescence Materials

2021 ◽  
Author(s):  
Youichi Tsuchiya ◽  
Stefan Diesing ◽  
Fatima Bencheikh ◽  
Yoshimasa Wada ◽  
Paloma dos Santos ◽  
...  
Keyword(s):  
Rate Constants ◽  
A Priori ◽  
Delayed Fluorescence ◽  
Rate Equations ◽  
Thermally Activated Delayed Fluorescence ◽  
Light Emitting ◽  
Thermally Activated ◽  
State Approximation ◽  
Three State Model ◽  
And Performance

The photophysical analysis of thermally activated delayed fluorescence (TADF) materials has become instrumental to providing insight into their stability and performance, which is not only relevant for organic light-emitting diodes (OLED), but also for other applications such as sensing, imaging and photocatalysis. Thus, a deeper understanding of the photophysics underpinning the TADF mechanism is required to push materials design further. Previously reported analyses in the literature of the kinetics of the various processes occurring in a TADF material rely on several a priori assumptions to estimate the rate constants for forward and reverse intersystem crossing (ISC and RISC, respectively). In this report, we demonstrate a method to determine these rate constants using a three-state model together with a steady-state approximation and, importantly, no additional assumptions. Further, we derive the exact rate equations, greatly facilitating a comparison of the TADF properties of structurally diverse emitters and providing a comprehensive understanding of the photophysics of these systems.

Molecular engineering of dendritic luminogens with thermally activated delayed fluorescence and aggregation-induced emission characteristics for efficient solution-processed non-doped OLEDs

2020 ◽  
Vol 8 (35) ◽  
pp. 12272-12283
Author(s):  
Fulong Ma ◽  
Xinxin Zhao ◽  
Hefang Ji ◽  
Dongdong Zhang ◽  
Kamran Hasrat ◽  
...  
Keyword(s):  
Efficient Solution ◽  
Delayed Fluorescence ◽  
Molecular Engineering ◽  
Intersystem Crossing ◽  
Emission Characteristics ◽  
Molecular Configuration ◽  
Solution Processed ◽  
Thermally Activated Delayed Fluorescence ◽  
Thermally Activated ◽  
Luminescence Efficiency

Improving the luminescence efficiency and reverse intersystem crossing of dendritic luminogens with AIE and TADF features by employing a highly twisted molecular configuration and multiple transition channels for solution-processed OLEDs.

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