scholarly journals En Route to High External Quantum Efficiency (∼12%), Organic True-Blue-Light-Emitting Diodes Employing Novel Design of Iridium (III) Phosphors

2009 ◽  
Vol 21 (21) ◽  
pp. 2221-2225 ◽  
Author(s):  
Yuan-Chieh Chiu ◽  
Jui-Yi Hung ◽  
Yun Chi ◽  
Chung-Chia Chen ◽  
Chih-Hao Chang ◽  
...  
Keyword(s):  
Blue Light ◽  
Quantum Efficiency ◽  
External Quantum Efficiency ◽  
Light Emitting Diodes ◽  
Light Emitting ◽  
True Blue ◽  
Novel Design

ZnS blue‐light‐emitting diodes with an external quantum efficiency of 5×10−4

1975 ◽  
Vol 27 (12) ◽  
pp. 697-699 ◽  
Author(s):  
Hirohiko Katayama ◽  
Shunri Oda ◽  
Hiroshi Kukimoto
Keyword(s):  
Blue Light ◽  
Quantum Efficiency ◽  
External Quantum Efficiency ◽  
Light Emitting Diodes ◽  
Light Emitting

Silicon carbide blue light emitting diodes with improved external quantum efficiency

1982 ◽  
Vol 53 (10) ◽  
pp. 6962-6967 ◽  
Author(s):  
L. Hoffmann ◽  
G. Ziegler ◽  
D. Theis ◽  
C. Weyrich
Keyword(s):  
Silicon Carbide ◽  
Blue Light ◽  
Quantum Efficiency ◽  
External Quantum Efficiency ◽  
Light Emitting Diodes ◽  
Light Emitting

Improvements of external quantum efficiency of InGaN-based blue light-emitting diodes at high current density using GaN substrates

2007 ◽  
Vol 101 (3) ◽  
pp. 033104 ◽  
Author(s):  
Katsushi Akita ◽  
Takashi Kyono ◽  
Yusuke Yoshizumi ◽  
Hiroyuki Kitabayashi ◽  
Koji Katayama
Keyword(s):  
Blue Light ◽  
Quantum Efficiency ◽  
Current Density ◽  
External Quantum Efficiency ◽  
Light Emitting Diodes ◽  
High Current Density ◽  
High Current ◽  
Light Emitting

scholarly journals Phenylalkylammonium passivation enables perovskite light emitting diodes with record high-radiance operational lifetime: the chain length matters

2021 ◽  
Vol 12 (1) ◽  
Author(s):  
Yuwei Guo ◽  
Sofia Apergi ◽  
Nan Li ◽  
Mengyu Chen ◽  
Chunyang Yin ◽  
...  
Keyword(s):  
Chain Length ◽  
Quantum Efficiency ◽  
External Quantum Efficiency ◽  
Light Emitting Diodes ◽  
Surface Defects ◽  
Theoretical Modelling ◽  
Ion Migration ◽  
Light Emitting ◽  
Operational Lifetime ◽  
Chain Lengths

AbstractPerovskite light emitting diodes suffer from poor operational stability, exhibiting a rapid decay of external quantum efficiency within minutes to hours after turn-on. To address this issue, we explore surface treatment of perovskite films with phenylalkylammonium iodide molecules of varying alkyl chain lengths. Combining experimental characterization and theoretical modelling, we show that these molecules stabilize the perovskite through suppression of iodide ion migration. The stabilization effect is enhanced with increasing chain length due to the stronger binding of the molecules with the perovskite surface, as well as the increased steric hindrance to reconfiguration for accommodating ion migration. The passivation also reduces the surface defects, resulting in a high radiance and delayed roll-off of external quantum efficiency. Using the optimized passivation molecule, phenylpropylammonium iodide, we achieve devices with an efficiency of 17.5%, a radiance of 1282.8 W sr−1 m−2 and a record T50 half-lifetime of 130 h under 100 mA cm−2.

An oligocarbazole-encapsulated heteroleptic red iridium complex for solution-processed nondoped phosphorescent organic light-emitting diodes with over 10% external quantum efficiency

2017 ◽  
Vol 5 (23) ◽  
pp. 5749-5756 ◽  
Author(s):  
Lingcheng Chen ◽  
Shumeng Wang ◽  
Zhimin Yan ◽  
Junqiao Ding ◽  
Lixiang Wang
Keyword(s):  
Quantum Efficiency ◽  
External Quantum Efficiency ◽  
Light Emitting Diodes ◽  
Organic Light Emitting Diodes ◽  
Iridium Complex ◽  
Solution Processed ◽  
Light Emitting ◽  
Organic Light

By fully encapsulating the heteroleptic red Ir complex with carbazole dendrons, solution-processed nondoped electrophosphorescent devices reveal over 10% EQE.

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