Enhanced Triplet–Triplet Annihilation of Blue Fluorescent Organic Light-Emitting Diodes by Generating Excitons in Trapped Charge-Free Regions

2019 ◽  
Vol 11 (51) ◽  
pp. 48121-48127 ◽  
Author(s):  
Hyoungcheol Lim ◽  
Hyung Jin Cheon ◽  
Gyeong Seok Lee ◽  
Mikyung Kim ◽  
Yun-Hi Kim ◽  
...  
Keyword(s):  
Light Emitting Diodes ◽  
Organic Light Emitting Diodes ◽  
Light Emitting ◽  
Organic Light ◽  
Trapped Charge ◽  
Triplet Triplet Annihilation

Degradation of fluorescent organic light emitting diodes caused by quenching of singlet and triplet excitons

2020 ◽  
Vol 8 (42) ◽  
pp. 14873-14879
Author(s):  
Duy Cong Le ◽  
Duong Dai Nguyen ◽  
Savanna Lloyd ◽  
Toshi-kazu Suzuki ◽  
Hideyuki Murata
Keyword(s):  
Light Emitting Diodes ◽  
Organic Light Emitting Diodes ◽  
Light Emitting ◽  
Singlet Exciton ◽  
Organic Light ◽  
Positively Charged ◽  
Triplet Excitons ◽  
Triplet Triplet Annihilation

The initial luminescence loss of fluorescent OLEDs utilizing triplet–triplet annihilation is not only caused by quenching of singlet exciton with neutral quenchers but also by that of triplet excitons with positively charged quenchers.

Triplet-triplet annihilation process in exciplex-based organic light-emitting diodes

2015 ◽  
Vol 60 (11) ◽  
pp. 1022-1029 ◽  
Author(s):  
YongZhou LING ◽  
WeiYao JIA ◽  
ChenXiao ZHAO ◽  
QiaoMing ZHANG ◽  
ChenLei LU ◽  
...  
Keyword(s):  
Light Emitting Diodes ◽  
Organic Light Emitting Diodes ◽  
Annihilation Process ◽  
Light Emitting ◽  
Organic Light ◽  
Triplet Triplet Annihilation

Current Density Dependence of Transient Electroluminescence in Phosphorescent Organic Light-Emitting Diodes

2011 ◽  
Vol 1286 ◽  
Author(s):  
Hirotake Kajii ◽  
Noriyoshi Takahota ◽  
Yadong Wang ◽  
Yutaka Ohmori
Keyword(s):  
Current Density ◽  
Light Emitting Diodes ◽  
High Current Density ◽  
Organic Light Emitting Diodes ◽  
Recombination Lifetime ◽  
Light Emitting ◽  
Organic Light ◽  
Decay Times ◽  
Transient Electroluminescence ◽  
Triplet Triplet Annihilation

ABSTRACTThe transient electroluminescence (EL) of phosphorescent organic light-emitting diodes (OLEDs) was investigated. The behaviors of the transient characteristics are analyzed using the triplet-triplet annihilation model. The device exhibited a gradual decrease in quantum current efficiency owing to the triplet-triplet annihilation at a high current density. At a higher current density, the reduced rise and decay times are due to high-density triplet excitons related to the enhanced triplet-triplet annihilation and the increase of the nonradiative process. The modulation speed of the devices is mainly limited by the phosphorescent recombination lifetime.

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