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.

scholarly journals Low roll-off of efficiency at high current density in phosphorescent organic light emitting diodes

2007 ◽  
Vol 90 (22) ◽  
pp. 223508 ◽  
Author(s):  
Jae-Wook Kang ◽  
Se-Hyung Lee ◽  
Hyung-Dol Park ◽  
Won-Ik Jeong ◽  
Kyung-Mo Yoo ◽  
...  
Keyword(s):  
Current Density ◽  
Light Emitting Diodes ◽  
High Current Density ◽  
Organic Light Emitting Diodes ◽  
High Current ◽  
Light Emitting ◽  
Organic Light

Injection and Transport of High Current Density over 1000 A/cm2in Organic Light Emitting Diodes under Pulse Excitation

2005 ◽  
Vol 44 (6A) ◽  
pp. 3659-3662 ◽  
Author(s):  
Hajime Nakanotani ◽  
Takahito Oyamada ◽  
Yuichiro Kawamura ◽  
Hiroyuki Sasabe ◽  
Chihaya Adachi
Keyword(s):  
Current Density ◽  
Light Emitting Diodes ◽  
High Current Density ◽  
Organic Light Emitting Diodes ◽  
Pulse Excitation ◽  
High Current ◽  
Light Emitting ◽  
Organic Light

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.

Kinetics of transient electroluminescence in organic light emitting diodes

2008 ◽  
Vol 41 (16) ◽  
pp. 165101 ◽  
Author(s):  
Manju Shukla ◽  
Pankaj Kumar ◽  
Suresh Chand ◽  
Nameeta Brahme ◽  
R S Kher ◽  
...  
Keyword(s):  
Light Emitting Diodes ◽  
Organic Light Emitting Diodes ◽  
Light Emitting ◽  
Organic Light ◽  
Transient Electroluminescence ◽  
Kinetics Of
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