Recent advances in organic thermally activated delayed fluorescence materials

2017 ◽  
Vol 46 (3) ◽  
pp. 915-1016 ◽  
Author(s):  
Zhiyong Yang ◽  
Zhu Mao ◽  
Zongliang Xie ◽  
Yi Zhang ◽  
Siwei Liu ◽  
...  
Keyword(s):  
Delayed Fluorescence ◽  
Thermally Activated Delayed Fluorescence ◽  
Thermally Activated ◽  
Recent Advances ◽  
Triplet Excitons

Thermally activated delayed fluorescence: harvesting dark triplet excitons to generate bright emissive singlet excitons.

Why Triage the Materials with Low Luminescence Quantum Efficiency: The Use of 35Cbz4BzCN as a Universal Host for Organic Light Emitting Diode through Effective Triplet Energy Transfer

2021 ◽  
Author(s):  
Yi-Mei Huang ◽  
Tse-Ying Chen ◽  
Deng-Gao Chen ◽  
Hsuan-Chi Liang ◽  
Cheng-Ham Wu ◽  
...  
Keyword(s):  
Light Emitting Diode ◽  
Delayed Fluorescence ◽  
Triplet Energy ◽  
Thermally Activated Delayed Fluorescence ◽  
Light Emitting ◽  
Organic Light Emitting Diode ◽  
Thermally Activated ◽  
Triplet Energy Transfer ◽  
Triplet Lifetime ◽  
Triplet Excitons

35Cbz4BzCN, a novel universal host with long triplet lifetime, has been developed. The triplet excitons in 35Cbz4BzCN can be effectively harvested by phosphorescence and thermally activated delayed fluorescence emitters. In...

Recent advances in thermally activated delayed fluorescence for white OLEDs applications

2020 ◽  
Vol 31 (6) ◽  
pp. 4444-4462 ◽  
Author(s):  
Chuang Xue ◽  
Huai Lin ◽  
Gang Zhang ◽  
Yuan Hu ◽  
Wenlong Jiang ◽  
...  
Keyword(s):  
Delayed Fluorescence ◽  
Thermally Activated Delayed Fluorescence ◽  
Thermally Activated ◽  
Recent Advances ◽  
White Oleds

scholarly journals Recent advances on organic blue thermally activated delayed fluorescence (TADF) emitters for organic light-emitting diodes (OLEDs)

2018 ◽  
Vol 14 ◽  
pp. 282-308 ◽  
Author(s):  
Thanh-Tuân Bui ◽  
Fabrice Goubard ◽  
Malika Ibrahim-Ouali ◽  
Didier Gigmes ◽  
Frédéric Dumur
Keyword(s):  
Molecular Orbital ◽  
Light Emitting Diodes ◽  
Molecular Design ◽  
Delayed Fluorescence ◽  
Organic Light Emitting Diodes ◽  
Thermally Activated Delayed Fluorescence ◽  
Light Emitting ◽  
Thermally Activated ◽  
Organic Light ◽  
Recent Advances

The design of highly emissive and stable blue emitters for organic light emitting diodes (OLEDs) is still a challenge, justifying the intense research activity of the scientific community in this field. Recently, a great deal of interest has been devoted to the elaboration of emitters exhibiting a thermally activated delayed fluorescence (TADF). By a specific molecular design consisting into a minimal overlap between the highest occupied molecular orbital (HOMO) and the lowest unoccupied molecular orbital (LUMO) due to a spatial separation of the electron-donating and the electron-releasing parts, luminescent materials exhibiting small S1–T1 energy splitting could be obtained, enabling to thermally upconvert the electrons from the triplet to the singlet excited states by reverse intersystem crossing (RISC). By harvesting both singlet and triplet excitons for light emission, OLEDs competing and sometimes overcoming the performance of phosphorescence-based OLEDs could be fabricated, justifying the interest for this new family of materials massively popularized by Chihaya Adachi since 2012. In this review, we proposed to focus on the recent advances in the molecular design of blue TADF emitters for OLEDs during the last few years.

Thermally activated delayed fluorescence material with aggregation-induced emission properties for highly efficient organic light-emitting diodes

2018 ◽  
Vol 6 (11) ◽  
pp. 2873-2881 ◽  
Author(s):  
Yaodong Zhao ◽  
Weigao Wang ◽  
Chen Gui ◽  
Li Fang ◽  
Xinlei Zhang ◽  
...  
Keyword(s):  
Delayed Fluorescence ◽  
Organic Light Emitting Diodes ◽  
Luminescent Materials ◽  
Thermally Activated Delayed Fluorescence ◽  
Light Emitting ◽  
Aggregation Induced Emission ◽  
Thermally Activated ◽  
Organic Light ◽  
Fluorescence Material ◽  
Triplet Excitons

Luminescent materials with aggregation-induced emission (AIE) properties exhibit high solid state emission, while thermally activated delayed fluorescence (TADF) materials can fully harvest singlet and triplet excitons to achieve efficient electroluminescence (EL).

Recent advances in persistent luminescence based on molecular hybrid materials

2021 ◽  
Author(s):  
Rui Gao ◽  
Mohamad S. Kodaimati ◽  
Dongpeng Yan
Keyword(s):  
Hybrid Materials ◽  
Room Temperature ◽  
Delayed Fluorescence ◽  
Luminescent Materials ◽  
Persistent Luminescence ◽  
Room Temperature Phosphorescence ◽  
Thermally Activated Delayed Fluorescence ◽  
Thermally Activated ◽  
Theoretical Approaches ◽  
Recent Advances

In this review, we summarize recent advances in establishing persistently luminescent materials from the view of examining experimental and theoretical approaches to room-temperature phosphorescence and thermally-activated delayed fluorescence.

scholarly journals Revisiting the Role of Charge Transfer and Local Excitations in Thermally Activated Delayed Fluorescence

2022 ◽  
Author(s):  
Leonardo Evaristo de Sousa ◽  
Piotr de Silva
Keyword(s):  
Charge Transfer ◽  
Excited States ◽  
Delayed Fluorescence ◽  
Equilibrium Geometry ◽  
Thermally Activated Delayed Fluorescence ◽  
Thermally Activated ◽  
Model Hamiltonian ◽  
The Difference ◽  
Triplet Excitons

Thermally activated delayed fluorescence (TADF) is a phenomenon that relies on the upconversion of triplet excitons to singlet excitons by means of reverse intersystem crossing (rISC). It has been shown both experimentally and theoretically that the TADF mechanism depends on the interplay between charge transfer and local excitations. However, the difference between the diabatic and adiabatic character of the involved excited states is rarely discussed in the literature. Here, we develop a diabatization procedure to implement a 4-state model Hamiltonian to a set of TADF molecules. We provide physical interpretation for the Hamiltonian elements and show their dependence on the electronic state of the equilibrium geometry. We also demonstrate how vibrations affect TADF efficiency by modifying the diabatic decomposition of the molecule. Finally, we provide a simple model that connects the diabatic Hamiltonian to the electronic properties relevant to TADF and show how such relationship translates into different optimization strategies for rISC, fluorescence and overall TADF performance.

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