Solution and Evaporation Hybrid Approach to Enhance the Stability and Pattern Resolution Characteristics of Organic Light-Emitting Diodes

2020 ◽  
Vol 12 (40) ◽  
pp. 45064-45072
Author(s):  
Hanchul Cho ◽  
Ho-Nyun Lee ◽  
Yong-Cheol Jeong ◽  
Young Min Park ◽  
Kyung-Tae Kang ◽  
...  
Keyword(s):  
Light Emitting Diodes ◽  
Hybrid Approach ◽  
Organic Light Emitting Diodes ◽  
Light Emitting ◽  
Organic Light ◽  
The Stability ◽  
Pattern Resolution

A solution-processable host material of 1,3-bis{3-[3-(9-carbazolyl)phenyl]-9-carbazolyl}benzene and its application in organic light-emitting diodes employing thermally activated delayed fluorescence

2015 ◽  
Vol 3 (8) ◽  
pp. 1700-1706 ◽  
Author(s):  
Yoshitake Suzuki ◽  
Qisheng Zhang ◽  
Chihaya Adachi
Keyword(s):  
Light Emitting Diodes ◽  
High Mobility ◽  
Delayed Fluorescence ◽  
Organic Light Emitting Diodes ◽  
Thermally Activated Delayed Fluorescence ◽  
Light Emitting ◽  
Thermally Activated ◽  
Stability Of Solution ◽  
Organic Light ◽  
The Stability

The stability of solution-processed organic light-emitting diodes employing a thermally activated delayed fluorescent emitter was improved using a host with a high glass transition temperature and high mobility electron transport layers.

scholarly journals Operational stability enhancement in organic light-emitting diodes with ultrathin Liq interlayers

2016 ◽  
Vol 6 (1) ◽  
Author(s):  
Daniel Ping-Kuen Tsang ◽  
Toshinori Matsushima ◽  
Chihaya Adachi
Keyword(s):  
Light Emitting Diodes ◽  
Delayed Fluorescence ◽  
Organic Light Emitting Diodes ◽  
Constant Current ◽  
Driving Voltage ◽  
Light Emitting ◽  
Organic Light ◽  
Hole Blocking Layer ◽  
Current Operation ◽  
The Stability

Abstract Organic light-emitting diodes (OLEDs) under constant current operation suffer from a decrease of luminance accompanied by an increase of driving voltage. We report a way to greatly improve the stability of OLEDs having a green emitter exhibiting thermally activated delayed fluorescence (TADF), (4s,6s)-2,4,5,6-tetra(9H-carbazol-9-yl) isophthalonitrile (4CzIPN), by introducing ultrathin (1 to 3 nm) interlayers of 8-hydroxyquinolinato lithium (Liq) between hole-blocking layer and its surrounding emissive and electron-transport layers. Under constant current operation starting at a luminescence of 1,000 cd/m2, the time to reach 90% of initial luminance (LT90) increased eight times, resulting in LT90 = 1,380 hours after insertion of the interlayers. Combining this new concept and mixed host system, LT95 was further extended to 1315 hours that is 16 times of reference device. This is the best value reported for TADF-based OLEDs and is comparable to the operational lifetimes of well-established phosphorescence-based OLEDs. Thermally stimulated current measurements showed that the number of deep charge traps was reduced with the insertion of the ultrathin Liq interlayer, indicating that reducing the number of deep traps is important for improving the operational lifetime and that exciton-polaron annihilation may be a source of the device degradation.

scholarly journals The influence of the interfacial layer on the stability of all-solution-processed organic light-emitting diodes

RSC Advances ◽  
2020 ◽  
Vol 10 (48) ◽  
pp. 28766-28777
Author(s):  
Lan-Sheng Yang ◽  
Hsin-Fei Meng ◽  
Yu-Chiang Chao ◽  
Hu-Chi Huang ◽  
Chih-Wei Luo ◽  
...  
Keyword(s):  
Interfacial Layer ◽  
Light Emitting Diodes ◽  
Organic Light Emitting Diodes ◽  
Solution Processed ◽  
Light Emitting ◽  
Organic Light ◽  
The Stability

Devices prepared by various solution-processed interfacial materials are compared with devices with thermal-evaporated CsF.

Status of and prospects for organic electroluminescence

1996 ◽  
Vol 11 (12) ◽  
pp. 3174-3187 ◽  
Author(s):  
Lewis J. Rothberg ◽  
Andrew J. Lovinger
Keyword(s):  
Light Emitting Diodes ◽  
Materials Science ◽  
Systems Design ◽  
Organic Light Emitting Diodes ◽  
Organic Electroluminescence ◽  
Light Emitting ◽  
Organic Light ◽  
Organic Electroluminescent ◽  
The Stability ◽  
Processing Techniques

We review the device and materials science behind organic electroluminescent diodes made both using discrete evaporable molecules and spin-cast organic polymers. A great deal of progress has been made in improving the efficiencies and spectral properties of organic light-emitting diodes, and these are now adequate for many applications. More work is necessary to understand the stability and degradation of emissive and charge-transporting organics, but some systems have been shown to be stable for 104 hours at display brightness. Major challenges still face the community in terms of developing satisfactory systems design and processing techniques if organic electroluminescence is to realize either performance or economic advantages over technologies and significantly penetrate the display market. We present an analysis of the suitability of organic light-emitting diodes for various applications, and consider the materials and manufacturing obstacles that must be overcome.

scholarly journals Dependence of the stability of organic light-emitting diodes on driving mode

2011 ◽  
Vol 56 (21) ◽  
pp. 2210-2214 ◽  
Author(s):  
WenWen Zhang ◽  
ZhaoXin Wu ◽  
XinWen Zhang ◽  
ShiXiong Liang ◽  
Bo Jiao ◽  
...  
Keyword(s):  
Light Emitting Diodes ◽  
Organic Light Emitting Diodes ◽  
Light Emitting ◽  
Driving Mode ◽  
Organic Light ◽  
The Stability

scholarly journals Metal Grid Structures for Enhancing the Stability and Performance of Solution‐Processed Organic Light‐Emitting Diodes

2020 ◽  
Vol 6 (12) ◽  
pp. 2000732
Author(s):  
Gregory Burwell ◽  
Nicholas Burridge ◽  
Oskar J. Sandberg ◽  
Eloise Bond ◽  
Wei Li ◽  
...  
Keyword(s):  
Light Emitting Diodes ◽  
Organic Light Emitting Diodes ◽  
Solution Processed ◽  
Light Emitting ◽  
Organic Light ◽  
Metal Grid ◽  
And Performance ◽  
The Stability
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