The Rational Control of Precursor Concentration in Perovskite Light-Emitting Diodes

Perovskite light-emitting diodes (PeLEDs) have attracted tremendous attention due to their ideal optoelectronic properties, such as high color purity, high fluorescence quantum yield, and tunable light color. The perovskite layer plays a decisive role in the performance of PeLEDs and the solvent eng...

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Bibliographic Details
Published in:Crystals (Basel) 2022-01, Vol.12 (1), p.60
Main Authors: Song, Keke, Zou, Xiaoping, Zhang, Huiyin, Cheng, Jin, Zhang, Chunqian, Liu, Baoyu, Wang, Xiaolan, Li, Xiaotong, Wang, Yifei, Ren, Baokai, Li, Junming
Format: Article
Language:English
Subjects:
Carrier injection
Color
Current efficiency
Efficiency
Fluorescence
Glass substrates
Investigations
Light emitting diodes
Morphology
Optoelectronic devices
perovskite
Perovskites
Precursors
Quantum efficiency
solvent engineering
Solvents
Thin films
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Summary:Perovskite light-emitting diodes (PeLEDs) have attracted tremendous attention due to their ideal optoelectronic properties, such as high color purity, high fluorescence quantum yield, and tunable light color. The perovskite layer plays a decisive role in the performance of PeLEDs and the solvent engineering of the perovskite layer is the key technological breakthrough in preparing high quality films. In this study, we have proposed the strategy of adding different amounts of solvents to the perovskite precursor solution to optimize the morphology of perovskite films and device performance. As a result, with the decreasing concentration of perovskite precursor solution, the perovskite film morphology is smoother and more favorable for carrier injection and combing, which induces an enhanced external quantum efficiency. The maximum luminance of PeLEDs was increased from 1667 cd/m2 to 9857 cd/m2 and the maximum current efficiency was increased from 6.7 cd/A to 19 cd/A. This work provides a trend to achieve improved film morphology and device performance for perovskite optoelectronic devices.
ISSN:2073-4352
2073-4352
DOI:10.3390/cryst12010060