Efficient Orange-Red Thermally Activated Delayed Fluorescence Emitters Feasible for Both Thermal Evaporation and Solution Process

2019 ◽  
Vol 11 (32) ◽  
pp. 29086-29093 ◽  
Author(s):  
Jia-Xiong Chen ◽  
Wen-Wen Tao ◽  
Ya-Fang Xiao ◽  
Kai Wang ◽  
Ming Zhang ◽  
...  
Keyword(s):  
Thermal Evaporation ◽  
Solution Process ◽  
Delayed Fluorescence ◽  
Thermally Activated Delayed Fluorescence ◽  
Thermally Activated

scholarly journals White light emitting diode based on purely organic fluorescent to modern thermally activated delayed fluorescence (TADF) and perovskite materials

2019 ◽  
Vol 6 (1) ◽  
Author(s):  
Dipjyoti Das ◽  
Peddaboodi Gopikrishna ◽  
Debasish Barman ◽  
Ramesh Babu Yathirajula ◽  
Parameswar Krishnan Iyer
Keyword(s):  
White Light ◽  
Light Emitting Diode ◽  
Solution Process ◽  
Delayed Fluorescence ◽  
Organic Polymer ◽  
Modern Concept ◽  
Thermally Activated Delayed Fluorescence ◽  
Light Emitting ◽  
Thermally Activated ◽  
Synthesis Strategy

Abstract White organic/polymer light emitting diode (WOLED/WPLED) processed from solution has attracted significant research interest in recent years due to their low device production cost, device flexibility, easy fabrication over large area including roll to roll and ability to print in various designs and shapes providing enormous design possibilities. Although WOLEDs fabricated using solution process lack their thermally evaporated counterparts in terms of device efficiency, remarkable progress has been made in this regard in recent years by utilizing new materials and device structures. In the present review, we have summarized and extrapolated an excellent association of old and modern concept of cost-effective materials and device structure for realization of white light. In particular, this article demonstrated and focused on design, and development of novel synthesis strategy, mechanistic insights and device engineering for solution process low cost WOLEDs device. Herein, an overview of the prevailing routes towards white light emitting devices (WLEDs) and corresponding materials used, including polymer based WLED, small molecules emitters based thermally activated delayed fluorescence (TADF), perovskite light-emitting diodes (PeLEDs) and hybrid materials based LEDs, color down-converting coatings with corresponding best efficiencies ever realized. We presume that this exhaustive review on WLEDs will offer a broad overview of the latest developments on white SSL and stonework the approach en route for innovations in the immediate future.

Highly efficient cuprous complexes with thermally activated delayed fluorescence and simplified solution process OLEDs using the ligand as host

2015 ◽  
Vol 3 (6) ◽  
pp. 1187-1195 ◽  
Author(s):  
Xu-Lin Chen ◽  
Chen-Sheng Lin ◽  
Xiao-Yuan Wu ◽  
Rongming Yu ◽  
Teng Teng ◽  
...  
Keyword(s):  
Solution Process ◽  
Delayed Fluorescence ◽  
Host Matrix ◽  
Solution Processed ◽  
Thermally Activated Delayed Fluorescence ◽  
Thermally Activated ◽  
Highly Efficient ◽  
Simplified Solution ◽  
Cuprous Complex

Two highly emissive cuprous complexes with TADF were synthesized. The ligand was used both as a ligand to form the emissive cuprous complex and as a host matrix for the formed emitter in a solution-processed OLED.

scholarly journals Thermally Activated Delayed Fluorescence in Commercially Available Materials for Solution-Process Exciplex OLEDs

Polymers ◽  
2021 ◽  
Vol 13 (10) ◽  
pp. 1668
Author(s):  
Zong-Liang Tseng ◽  
Wei-Lun Huang ◽  
Tzu-Hung Yeh ◽  
You-Xun Xu ◽  
Chih-Hsun Chiang
Keyword(s):  
High Performance ◽  
Lower Cost ◽  
High Efficiency ◽  
Collection Efficiency ◽  
Solution Process ◽  
Delayed Fluorescence ◽  
Thermally Activated Delayed Fluorescence ◽  
Light Emitting ◽  
Thermally Activated ◽  
Simple Combination

Organic light-emitting diodes (OLEDs) have developed rapidly in recent years. Thermally activated delayed fluorescent (TADF) molecules open a path to increase exciton collection efficiency from 25% to 100%, and the solution process provides an alternative technology to achieve lower cost OLEDs more easily. To develop commercial materials as exciplex hosts for high-performance and solution-processed OLEDs, we attempted to use 4,4′-cyclohexylidenebis[N,N-bis(4-methylphenyl)benzenamine (TAPC), poly(9-vinylcarbazole) (PVK), N,N′-Di(1-naphthyl)-N,N′-diphenyl-(1,1′-biphenyl)-4,4′-diamine (NPB), and poly(N,N'-bis-4-butylphenyl-N,N'-bisphenyl)benzidine (Poly-TPD) as the donors and 2,4,6-tris[3-(diphenylphosphinyl)phenyl]-1,3,5-triazine (POT2T) as the acceptor to obtain the TADF effect. All donors and the acceptor were purchased from chemical suppliers. Our work shows that excellent TADF properties and high-efficiency exciplex OLEDs with low turn-on voltage and high luminance can be achieved with a simple combination of commercial materials.

Bicolour electroluminescence of 2-(carbazol-9-yl)anthraquinone based on a solution process

2017 ◽  
Vol 5 (46) ◽  
pp. 12031-12034 ◽  
Author(s):  
Bin Huang ◽  
Zijing Li ◽  
Hui Yang ◽  
Die Hu ◽  
Wenjing Wu ◽  
...  
Keyword(s):  
Organic Molecule ◽  
Solution Process ◽  
Delayed Fluorescence ◽  
Thermally Activated Delayed Fluorescence ◽  
Aggregation Induced Emission ◽  
Thermally Activated ◽  
Mechanochromic Luminescence

Mechanochromic luminescence, thermally activated delayed fluorescence, aggregation-induced emission, and electroluminescence properties are combined in a single organic molecule, 2-(carbazol-9-yl)-anthraquinone (Cz-AQ).

Design of encapsulated hosts and guests for highly efficient blue and green thermally activated delayed fluorescence OLEDs based on a solution-process

2017 ◽  
Vol 53 (86) ◽  
pp. 11834-11837 ◽  
Author(s):  
Xinxin Ban ◽  
Aiyun Zhu ◽  
Tianlin Zhang ◽  
Zhiwei Tong ◽  
Wei Jiang ◽  
...  
Keyword(s):  
Solution Process ◽  
Delayed Fluorescence ◽  
Molecular Aggregation ◽  
Molecular Encapsulation ◽  
Thermally Activated Delayed Fluorescence ◽  
Thermally Activated ◽  
Highly Efficient ◽  
Guest System

The molecular aggregation and exciton–polaron interaction of the TADF host–guest system were successfully restricted by efficient molecular encapsulation.

scholarly journals Correction: Highly efficient cuprous complexes with thermally activated delayed fluorescence and simplified solution process OLEDs using the ligand as host

2015 ◽  
Vol 3 (6) ◽  
pp. 1408-1408
Author(s):  
Xu-Lin Chen ◽  
Chen-Sheng Lin ◽  
Xiao-Yuan Wu ◽  
Rongming Yu ◽  
Teng Teng ◽  
...  
Keyword(s):  
Solution Process ◽  
Delayed Fluorescence ◽  
Thermally Activated Delayed Fluorescence ◽  
Thermally Activated ◽  
Highly Efficient ◽  
Simplified Solution

Correction for ‘Highly efficient cuprous complexes with thermally activated delayed fluorescence and simplified solution process OLEDs using the ligand as host’ by X.-L. Chen et al., J. Mater. Chem. C, 2015, DOI: 10.1039/c4tc02255f.

Solvent Dependence of Structural Dynamics and Spin-flip Processes in 3,4,5-tri(9H-carbazole-9-yl)benzonitrile (ortho-3CzBN)

2020 ◽  
Author(s):  
Masaki Saigo ◽  
Kiyoshi Miyata ◽  
Hajime Nakanotani ◽  
Chihaya Adachi ◽  
Ken Onda
Keyword(s):  
Dft Calculations ◽  
Excited States ◽  
Structural Changes ◽  
Photophysical Properties ◽  
Delayed Fluorescence ◽  
Time Resolved ◽  
Thermally Activated Delayed Fluorescence ◽  
Thermally Activated ◽  
Solvent Dependence ◽  
Acetonitrile Solutions

We have investigated the solvent-dependence of structural changes along with intersystem crossing of a thermally activated delayed fluorescence (TADF) molecule, 3,4,5-tri(9H-carbazole-9-yl)benzonitrile (o-3CzBN), in toluene, tetrahydrofuran, and acetonitrile solutions using time-resolved infrared (TR-IR) spectroscopy and DFT calculations. We found that the geometries of the S1 and T1 states are very similar in all solvents though the photophysical properties mostly depend on the solvent. In addition, the time-dependent DFT calculations based on these geometries suggested that the thermally activated delayed fluorescence process of o-3CzBN is governed more by the higher-lying excited states than by the structural changes in the excited states.<br>

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