CN engineered electron transport type hosts for high efficiency and extended lifetime in blue thermally activated delayed fluorescent organic light-emitting diodes

2021 ◽  
Author(s):  
Sung Yong Byun ◽  
Kyung Hyung Lee ◽  
Jun Yeob Lee
Keyword(s):  
Molecular Structure ◽  
Electron Transport ◽  
High Efficiency ◽  
Light Emitting Diodes ◽  
Organic Light Emitting Diodes ◽  
Light Emitting ◽  
Thermally Activated ◽  
Organic Light ◽  
Host Materials ◽  
Transport Type

Electron transport type host materials for blue thermally activated delayed fluorescent (TADF) organic light-emitting diodes (OLEDs) were synthesized by engineering the electron withdrawing CN units in the molecular structure. The...

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.

A novel electroplex host with dual triplet exciton up-converting channels suppressing triplet exciton induced degradation mechanisms in blue organic light-emitting diodes

2021 ◽  
Author(s):  
Ju Hui Yun ◽  
Jae-Min Kim ◽  
Won Jae Chung ◽  
Jun Seop Lim ◽  
Jun Yeob Lee ◽  
...  
Keyword(s):  
Electron Transport ◽  
Light Emitting Diodes ◽  
Triplet Exciton ◽  
Organic Light Emitting Diodes ◽  
Degradation Mechanisms ◽  
Light Emitting ◽  
Type Host ◽  
Thermally Activated ◽  
Organic Light ◽  
Transport Type

A novel electroplex host with two triplet exciton up-converting channels for suppressed triplet exciton triggered degradation mechanisms was developed using an electron transport type host (n-type host) with thermally activated...

Spatially optimized quaternary phosphine oxide host materials for high-efficiency blue phosphorescence and thermally activated delayed fluorescence organic light-emitting diodes

2015 ◽  
Vol 3 (43) ◽  
pp. 11385-11396 ◽  
Author(s):  
Dongxue Ding ◽  
Zhen Zhang ◽  
Ying Wei ◽  
Pengfei Yan ◽  
Hui Xu
Keyword(s):  
Phosphine Oxide ◽  
High Efficiency ◽  
Light Emitting Diodes ◽  
Spatial Optimization ◽  
Delayed Fluorescence ◽  
Organic Light Emitting Diodes ◽  
Light Emitting ◽  
Thermally Activated ◽  
Organic Light ◽  
Host Materials

Spatial optimization of host materials for highly efficient blue organic light-emitting diodes was rationally performed on the basis of a series of ternary and quaternary phosphine oxide materials.

Correlation of the molecular structure of host materials with lifetime and efficiency of blue phosphorescent organic light-emitting diodes

2015 ◽  
Vol 17 (37) ◽  
pp. 24468-24474 ◽  
Author(s):  
Ji Won Yang ◽  
Jun Yeob Lee
Keyword(s):  
Molecular Structure ◽  
High Efficiency ◽  
Light Emitting Diodes ◽  
Organic Light Emitting Diodes ◽  
Light Emitting ◽  
Organic Light ◽  
Host Materials ◽  
Backbone Structure ◽  
Blue Phosphorescent

High efficiency and stable blue phosphorescent organic light-emitting diodes were developed using host materials derived from the bicarbazole backbone structure.

Effect of the molecular structure of the host materials on the lifetime of green thermally activated delayed fluorescent organic light-emitting diodes

2015 ◽  
Vol 3 (31) ◽  
pp. 8061-8065 ◽  
Author(s):  
Yirang Im ◽  
Wook Song ◽  
Jun Yeob Lee
Keyword(s):  
Molecular Structure ◽  
Light Emitting Diodes ◽  
Organic Light Emitting Diodes ◽  
Light Emitting ◽  
Thermally Activated ◽  
Organic Light ◽  
Host Materials

The effect of the molecular structure of the host materials on the efficiency and lifetime of the green thermally activated delayed fluorescent devices was studied using two dibenzothiophene derived host materials.

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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