Degradation mechanism of blue thermally activated delayed fluorescent organic light-emitting diodes under electrical stress

2019 ◽  
Vol 70 ◽  
pp. 286-291 ◽  
Author(s):  
Jiho Sohn ◽  
Donghyun Ko ◽  
Hyunho Lee ◽  
Jongseok Han ◽  
Sin-Doo Lee ◽  
...  
Keyword(s):  
Light Emitting Diodes ◽  
Degradation Mechanism ◽  
Organic Light Emitting Diodes ◽  
Light Emitting ◽  
Thermally Activated ◽  
Electrical Stress ◽  
Organic Light

scholarly journals Analysis of Transient Degradation Behaviors of Organic Light-Emitting Diodes under Electrical Stress

2021 ◽  
Vol 11 (16) ◽  
pp. 7627
Author(s):  
Gyeong Won Lee ◽  
Yoonsuk Choi ◽  
Heejin Kim ◽  
Jongwoo Park ◽  
Jong-In Shim ◽  
...  
Keyword(s):  
Electron Transport ◽  
Light Emitting Diodes ◽  
Degradation Mechanism ◽  
Transient Behavior ◽  
Organic Light Emitting Diodes ◽  
Light Emitting ◽  
Electrical Stress ◽  
Carrier Recombination ◽  
Organic Light ◽  
Degradation Behaviors

Despite the wide application of organic light-emitting diodes (OLEDs), the performance of OLED devices is sometimes limited by their reliabilities. In this paper, we report the transient degradation behaviors of fluorescent blue OLEDs, where both the current and luminance initially increase under electrical stress within a short stress time. We analyze the degradation mechanism in terms of the carrier recombination and transport. From the comprehensive analyses of electrical and optical characteristics, it is suggested that the electron transport is responsible for the initial transient behavior of the device.

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.

Lowest unoccupied molecular orbital managing function of CN-substituted dibenzofuran in high triplet energy hosts for blue thermally-activated delayed fluorescent organic light-emitting diodes

2021 ◽  
Author(s):  
Sung Yong Byun ◽  
Kyung Hyung Lee ◽  
Jun Yeob Lee
Keyword(s):  
Molecular Orbital ◽  
Light Emitting Diodes ◽  
Delayed Fluorescence ◽  
Organic Light Emitting Diodes ◽  
Triplet Energy ◽  
Thermally Activated Delayed Fluorescence ◽  
Light Emitting ◽  
Thermally Activated ◽  
Organic Light ◽  
Lowest Unoccupied Molecular Orbital

The effect of lowest unoccupied molecular orbital (LUMO) management of high triplet energy electron transport type hosts on the device performance of blue thermally-activated delayed fluorescence (TADF) organic light-emitting diodes...

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...

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