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.

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...

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.

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.

High triplet energy exciplex host derived from a CN modified carbazole based n-type host for improved efficiency and lifetime in blue phosphorescent organic light-emitting diodes

2018 ◽  
Vol 6 (38) ◽  
pp. 10308-10314 ◽  
Author(s):  
Su Kyeong Shin ◽  
Si Hyun Han ◽  
Jun Yeob Lee
Keyword(s):  
Electron Transport ◽  
Light Emitting Diodes ◽  
Hole Transport ◽  
Organic Light Emitting Diodes ◽  
Triplet Energy ◽  
Light Emitting ◽  
Type Host ◽  
Organic Light ◽  
Blue Phosphorescent ◽  
Transport Type

High triplet energy exciplexes which can improve the lifetime of blue phosphorescent organic light-emitting diodes were developed by mixing a carbazole based hole transport type host with a CN modified carbazole based electron transport type host.

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.

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...

Phenothiazine dioxide based high triplet energy host materials for blue phosphorescent organic light-emitting diodes

RSC Advances ◽  
2015 ◽  
Vol 5 (118) ◽  
pp. 97903-97909 ◽  
Author(s):  
In Ho Lee ◽  
Jun Yeob Lee
Keyword(s):  
Electron Transport ◽  
Light Emitting Diodes ◽  
Hole Transport ◽  
Organic Light Emitting Diodes ◽  
Triplet Energy ◽  
Light Emitting ◽  
Organic Light ◽  
Host Materials ◽  
Donor Acceptor ◽  
Blue Phosphorescent

Donor–acceptor type high triplet energy host materials were derived from a phenothiazine dioxide based electron transport moiety and a carbazole based hole transport moiety.

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