Understanding the Role of Ion Migration in the Operation of Perovskite Light-Emitting Diodes by Transient Measurements

2020 ◽  
Vol 12 (43) ◽  
pp. 48845-48853
Author(s):  
Qi Dong ◽  
Juliana Mendes ◽  
Lei Lei ◽  
Dovletgeldi Seyitliyev ◽  
Liping Zhu ◽  
...  
Keyword(s):  
Light Emitting Diodes ◽  
Ion Migration ◽  
Light Emitting ◽  
Transient Measurements

scholarly journals Suppressing Ion Migration Enables Stable Perovskite Light‐Emitting Diodes with All‐Inorganic Strategy

2020 ◽  
Vol 30 (40) ◽  
pp. 2001834 ◽  
Author(s):  
Lin Zhang ◽  
Fang Yuan ◽  
Jun Xi ◽  
Bo Jiao ◽  
Hua Dong ◽  
...  
Keyword(s):  
Light Emitting Diodes ◽  
Ion Migration ◽  
Light Emitting

Unraveling the Role of Crystallization Dynamics on Luminescence Characteristics of Perovskite Light‐Emitting Diodes

2021 ◽  
pp. 2100023
Author(s):  
Kong‐Chao Shen ◽  
Jing‐Kun Wang ◽  
Yang Shen ◽  
Yan‐Qing Li ◽  
Ming‐Lei Guo ◽  
...  
Keyword(s):  
Light Emitting Diodes ◽  
Light Emitting ◽  
Crystallization Dynamics ◽  
Luminescence Characteristics

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.

The role of mesa size in nano-structured green AlGaInN light-emitting diodes

2011 ◽  
Vol 8 (7-8) ◽  
pp. 2311-2314 ◽  
Author(s):  
Christoph J. M. Stark ◽  
Theeradetch Detchprohm ◽  
Christian Wetzel
Keyword(s):  
Light Emitting Diodes ◽  
Light Emitting
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