A Universal Thermally Activated Delayed Fluorescence Host with Short Triplet Lifetime for Highly Efficient Phosphorescent OLEDs with Extremely Low Efficiency Roll-off

2021 ◽  
Author(s):  
Jian Fan ◽  
Bangjin Sun ◽  
Kaining Tong ◽  
Xing Chen ◽  
Jian-Li He ◽  
...  
Keyword(s):  
Delayed Fluorescence ◽  
Triplet Exciton ◽  
Organic Light Emitting Diodes ◽  
Thermally Activated Delayed Fluorescence ◽  
Light Emitting ◽  
Exciton Density ◽  
Thermally Activated ◽  
Organic Light ◽  
Low Efficiency ◽  
Triplet Lifetime

Triplet-involved quenching processes lead to significant efficiency roll-off in phosphorescent organic light-emitting diodes (OLEDs). Thermally activated delayed fluorescence (TADF) materials can reduce the triplet exciton density in the emitting layer...

Solution-processable orange-red thermally activated delayed fluorescence emitters with 3,6-disubstituted carbazole for highly efficient OLEDs with low efficiency roll-off

2022 ◽  
Author(s):  
Yaxing Zhang ◽  
Yuanyuan Zheng ◽  
Changsheng Shi ◽  
Jinyan Zhang ◽  
Tao Wang ◽  
...  
Keyword(s):  
Light Emitting Diodes ◽  
Delayed Fluorescence ◽  
Organic Light Emitting Diodes ◽  
Thermally Activated Delayed Fluorescence ◽  
Light Emitting ◽  
Thermally Activated ◽  
Organic Light ◽  
Green Materials ◽  
Device Efficiency ◽  
Low Efficiency

The progress of orange-red thermally activated delayed fluorescence (TADF) emitters for solution-processed organic light-emitting diodes (OLEDs) is still lagged behind blue and green materials in terms of device efficiency. In...

Naphthyridine-based thermally activated delayed fluorescence emitters for multi-color organic light-emitting diodes with low efficiency roll-off

2019 ◽  
Vol 7 (16) ◽  
pp. 4673-4680 ◽  
Author(s):  
Cheng Chen ◽  
Hai-Yan Lu ◽  
Yin-Feng Wang ◽  
Meng Li ◽  
Yi-Fan Shen ◽  
...  
Keyword(s):  
Light Emitting Diodes ◽  
Delayed Fluorescence ◽  
Organic Light Emitting Diodes ◽  
Thermally Activated Delayed Fluorescence ◽  
Light Emitting ◽  
Thermally Activated ◽  
Organic Light ◽  
Low Efficiency

1,8-Naphthyridine-based TADF molecules were utilized as a new kind of emitter for multi-color OLEDs with low efficiency roll-off.

scholarly journals Stable green phosphorescence organic light-emitting diodes with low efficiency roll-off using a novel bipolar thermally activated delayed fluorescence material as host

2017 ◽  
Vol 8 (2) ◽  
pp. 1259-1268 ◽  
Author(s):  
Kunping Guo ◽  
Hedan Wang ◽  
Zixing Wang ◽  
Changfeng Si ◽  
Cuiyun Peng ◽  
...  
Keyword(s):  
Light Emitting Diodes ◽  
Delayed Fluorescence ◽  
Organic Light Emitting Diodes ◽  
Thermally Activated Delayed Fluorescence ◽  
Light Emitting ◽  
Thermally Activated ◽  
Organic Light ◽  
Low Efficiency ◽  
Fluorescence Material

A bipolar host with TADF properties is realized, endowing green PhOLEDs with a twentyfold lifetime improvement.

Highly efficient thermally activated delayed fluorescence yellow organic light-emitting diodes with a low efficiency roll-off

2019 ◽  
Vol 7 (26) ◽  
pp. 8063-8069 ◽  
Author(s):  
Xiang-Long Li ◽  
Xinyi Cai ◽  
Muhammad Umair Ali ◽  
Shi-Jian Su ◽  
Hong Meng
Keyword(s):  
Light Emitting Diodes ◽  
Delayed Fluorescence ◽  
Organic Light Emitting Diodes ◽  
Thermally Activated Delayed Fluorescence ◽  
Light Emitting ◽  
Thermally Activated ◽  
Highly Efficient ◽  
Organic Light ◽  
Device Engineering ◽  
Low Efficiency

Highly efficient TADF yellow OLEDs with an extremely low efficiency roll-off have been obtained herein via rational device engineering.

scholarly journals Hot exciplexes in U-shaped TADF molecules with emission from locally excited states

2021 ◽  
Vol 12 (1) ◽  
Author(s):  
A. Lennart Schleper ◽  
Kenichi Goushi ◽  
Christoph Bannwarth ◽  
Bastian Haehnle ◽  
Philipp J. Welscher ◽  
...  
Keyword(s):  
Light Emitting Diodes ◽  
Delayed Fluorescence ◽  
Organic Light Emitting Diodes ◽  
Thermally Activated Delayed Fluorescence ◽  
Light Emitting ◽  
Thermally Activated ◽  
Organic Light ◽  
Donor And Acceptor ◽  
Low Efficiency ◽  
High Color Purity

AbstractFast emission and high color purity are essential characteristics of modern opto-electronic devices, such as organic light emitting diodes (OLEDs). These properties are currently not met by the latest generation of thermally activated delayed fluorescence (TADF) emitters. Here, we present an approach, called “hot exciplexes” that enables access to both attributes at the same time. Hot exciplexes are produced by coupling facing donor and acceptor moieties to an anthracene bridge, yielding an exciplex with large T1 to T2 spacing. The hot exciplex model is investigated using optical spectroscopy and quantum chemical simulations. Reverse intersystem crossing is found to occur preferentially from the T3 to the S1 state within only a few nanoseconds. Application and practicality of the model are shown by fabrication of organic light-emitting diodes with up to 32 % hot exciplex contribution and low efficiency roll-off.

Highly Efficient and Stable Blue Organic Light-Emitting Diodes through Selective Quenching of Long-Living Triplet Exciton of Thermally Activated Delayed Fluorescence Emitter

2021 ◽  
Author(s):  
Won Jae Chung ◽  
Jun Yeob Lee
Keyword(s):  
High Efficiency ◽  
Light Emitting Diodes ◽  
Delayed Fluorescence ◽  
Triplet Exciton ◽  
Organic Light Emitting Diodes ◽  
Thermally Activated Delayed Fluorescence ◽  
Light Emitting ◽  
Thermally Activated ◽  
Organic Light ◽  
Device Lifetime

In the organic light emitting diodes (OLEDs), the achievement of high efficiency and long device lifetime has been a goal due to the short device lifetime of the high efficiency...

Solution-processed small-molecular white organic light-emitting diodes based on a thermally activated delayed fluorescence dendrimer

2017 ◽  
Vol 5 (38) ◽  
pp. 10001-10006 ◽  
Author(s):  
Xiaoqing Liao ◽  
Xin Yang ◽  
Rong Zhang ◽  
Jiang Cheng ◽  
Jie Li ◽  
...  
Keyword(s):  
High Current Density ◽  
Delayed Fluorescence ◽  
Organic Light Emitting Diodes ◽  
Iridium Complex ◽  
Solution Processed ◽  
Thermally Activated Delayed Fluorescence ◽  
Light Emitting ◽  
Thermally Activated ◽  
Organic Light ◽  
Low Efficiency

Solution-processed white OLEDs based on a blue TADF dendrimer host and an orange iridium complex dopant achieved a maximum EQE of 10.1% with low efficiency roll-off at high current density.

High-performance hybrid white organic light-emitting diodes with simple emitting structures and low efficiency roll-off based on blue thermally activated delayed fluorescence emitters with bipolar transport characteristics

2018 ◽  
Vol 6 (35) ◽  
pp. 9510-9516 ◽  
Author(s):  
Chenyang Zhao ◽  
Tianmu Zhang ◽  
Jiangshan Chen ◽  
Donghang Yan ◽  
Dongge Ma
Keyword(s):  
High Performance ◽  
Light Emitting Diodes ◽  
Delayed Fluorescence ◽  
Organic Light Emitting Diodes ◽  
Thermally Activated Delayed Fluorescence ◽  
Light Emitting ◽  
Thermally Activated ◽  
Highly Efficient ◽  
Organic Light ◽  
Low Efficiency

Highly efficient and low efficiency roll-off WOLEDs by simple insertion of multi-ultrathin phosphorescent layers within blue TADF emitters.

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