Wet-process feasible novel carbazole-type molecular host for high efficiency phosphorescent organic light emitting diodes

2014 ◽  
Vol 2 (41) ◽  
pp. 8707-8714 ◽  
Author(s):  
Jwo-Huei Jou ◽  
Sudhir Kumar ◽  
Daiva Tavgeniene ◽  
Chih-Chia An ◽  
Po-Hsun Fang ◽  
...  
Keyword(s):  
Current Efficiency ◽  
High Efficiency ◽  
Organic Light Emitting Diodes ◽  
Triplet Energy ◽  
Light Emitting ◽  
Type Host ◽  
Wet Process ◽  
Organic Light ◽  
Host Materials ◽  
Green Emitter

Wet-process feasible high triplet energy carbazole type host materials are synthesized. On doping a green emitter into a host carbazole, the device shows an efficacy of 51 lm W¬1 and current efficiency of 52 cd A¬1 at 100 cd m−2.

Triazine-dibenzofuran-Based n-Type Host Materials for High-Efficiency and Long-Lifetime Green Phosphorescent Organic Light-Emitting Diodes

2021 ◽  
Author(s):  
Dong Jun Kim ◽  
Sunhee Lee ◽  
Yong Hui Lee ◽  
Hyungkeun Jang ◽  
Kwang-Hyun Ahn ◽  
...  
Keyword(s):  
High Efficiency ◽  
Light Emitting Diodes ◽  
Organic Light Emitting Diodes ◽  
Light Emitting ◽  
Type Host ◽  
Organic Light ◽  
Host Materials ◽  
Long Lifetime

Effective host materials are required to improve the performance of phosphorescent organic light-emitting diodes (PhOLEDs). Herein, a series of triazine-dibenzofuran-based n-type host materials, DBT1–DBT4, was prepared by varying the substitution...

Benzonitrile and dicyanocarbazole derived electron transport type host materials for improved device lifetime in blue thermally activated delayed fluorescent organic light-emitting diodes

2020 ◽  
Vol 8 (17) ◽  
pp. 5832-5838 ◽  
Author(s):  
Sung Yong Byeon ◽  
Kyung Hyung Lee ◽  
Jun Yeob Lee
Keyword(s):  
Electron Transport ◽  
High Efficiency ◽  
Organic Light Emitting Diodes ◽  
Triplet Energy ◽  
Light Emitting ◽  
Thermally Activated ◽  
Organic Light ◽  
Host Materials ◽  
Device Lifetime ◽  
Transport Type

The electron transport host materials derived from dibenzofuran, benzonitrile and dicyanocarbazole units showed high triplet energy above 3.0 eV, high efficiency over 20% and 31 h lifetime up to 75% of initial luminance at 500 cd m−2.

scholarly journals High efficiency blue organic light-emitting diodes with below-bandgap electroluminescence

2021 ◽  
Vol 12 (1) ◽  
Author(s):  
Maria Vasilopoulou ◽  
Abd. Rashid bin Mohd Yusoff ◽  
Matyas Daboczi ◽  
Julio Conforto ◽  
Anderson Emanuel Ximim Gavim ◽  
...  
Keyword(s):  
High Efficiency ◽  
Light Emitting Diodes ◽  
High Mobility ◽  
Organic Light Emitting Diodes ◽  
Triplet Energy ◽  
Material Interface ◽  
Light Emitting ◽  
Thermally Activated ◽  
Organic Light ◽  
Hole Transporting

AbstractBlue organic light-emitting diodes require high triplet interlayer materials, which induce large energetic barriers at the interfaces resulting in high device voltages and reduced efficiencies. Here, we alleviate this issue by designing a low triplet energy hole transporting interlayer with high mobility, combined with an interface exciplex that confines excitons at the emissive layer/electron transporting material interface. As a result, blue thermally activated delay fluorescent organic light-emitting diodes with a below-bandgap turn-on voltage of 2.5 V and an external quantum efficiency (EQE) of 41.2% were successfully fabricated. These devices also showed suppressed efficiency roll-off maintaining an EQE of 34.8% at 1000 cd m−2. Our approach paves the way for further progress through exploring alternative device engineering approaches instead of only focusing on the demanding synthesis of organic compounds with complex structures.

High-efficiency red, green and blue phosphorescent homojunction organic light-emitting diodes based on bipolar host materials

2011 ◽  
Vol 12 (5) ◽  
pp. 843-850 ◽  
Author(s):  
Chao Cai ◽  
Shi-Jian Su ◽  
Takayuki Chiba ◽  
Hisahiro Sasabe ◽  
Yong-Jin Pu ◽  
...  
Keyword(s):  
High Efficiency ◽  
Light Emitting Diodes ◽  
Organic Light Emitting Diodes ◽  
Light Emitting ◽  
Organic Light ◽  
Host Materials ◽  
Blue Phosphorescent
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