In-Situ Formed Type i Nanocrystalline Perovskite Film for Highly Efficient Light-Emitting Diode

Jin Wook Lee; Yung Ji Choi; June Mo Yang; Sujin Ham; Sang Kyu Jeon; Jun Yeob Lee; Young Hyun Song; Eun Kyung Ji; Dae Ho Yoon; Seongrok Seo; Hyunjung Shin; Gil Sang Han; Hyun Suk Jung; Dongho Kim; Nam Gyu Park

doi:10.1021/acsnano.7b00608

In-Situ Formed Type i Nanocrystalline Perovskite Film for Highly Efficient Light-Emitting Diode

Jin Wook Lee, Yung Ji Choi, June Mo Yang, Sujin Ham, Sang Kyu Jeon, Jun Yeob Lee, Young Hyun Song, Eun Kyung Ji, Dae Ho Yoon, Seongrok Seo, Hyunjung Shin, Gil Sang Han, Hyun Suk Jung, Dongho Kim, Nam Gyu Park

Department of Chemistry

Research output: Contribution to journal › Article › peer-review

152 Citations (Scopus)

Abstract

Excellent color purity with a tunable band gap renders organic-inorganic halide perovskite highly capable of performing as light-emitting diodes (LEDs). Perovskite nanocrystals show a photoluminescence quantum yield exceeding 90%, which, however, decreases to lower than 20% upon formation of a thin film. The limited photoluminescence quantum yield of a perovskite thin film has been a formidable obstacle for development of highly efficient perovskite LEDs. Here, we report a method for highly luminescent MAPbBr₃ (MA = CH₃NH₃) nanocrystals formed in situ in a thin film based on nonstoichiometric adduct and solvent-vacuum drying approaches. Excess MABr with respect to PbBr₂ in precursor solution plays a critical role in inhibiting crystal growth of MAPbBr₃, thereby forming nanocrystals and creating type I band alignment with core MAPbBr₃ by embedding MAPbBr₃ nanocrystals in the unreacted wider band gap MABr. A solvent-vacuum drying process was developed to preserve nanocrystals in the film, which realizes a fast photoluminescence lifetime of 3.9 ns along with negligible trapping processes. Based on a highly luminescent nanocrystalline MAPbBr₃ thin film, a highly efficient green LED with a maximum external quantum efficiency of 8.21% and a current efficiency of 34.46 cd/A was demonstrated.

Original language	English
Pages (from-to)	3311-3319
Number of pages	9
Journal	ACS Nano
Volume	11
Issue number	3
DOIs	https://doi.org/10.1021/acsnano.7b00608
Publication status	Published - 2017 Mar 28

Bibliographical note

Publisher Copyright:
© 2017 American Chemical Society.

All Science Journal Classification (ASJC) codes

Materials Science(all)
Engineering(all)
Physics and Astronomy(all)

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10.1021/acsnano.7b00608

Cite this

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title = "In-Situ Formed Type i Nanocrystalline Perovskite Film for Highly Efficient Light-Emitting Diode",

abstract = "Excellent color purity with a tunable band gap renders organic-inorganic halide perovskite highly capable of performing as light-emitting diodes (LEDs). Perovskite nanocrystals show a photoluminescence quantum yield exceeding 90%, which, however, decreases to lower than 20% upon formation of a thin film. The limited photoluminescence quantum yield of a perovskite thin film has been a formidable obstacle for development of highly efficient perovskite LEDs. Here, we report a method for highly luminescent MAPbBr3 (MA = CH3NH3) nanocrystals formed in situ in a thin film based on nonstoichiometric adduct and solvent-vacuum drying approaches. Excess MABr with respect to PbBr2 in precursor solution plays a critical role in inhibiting crystal growth of MAPbBr3, thereby forming nanocrystals and creating type I band alignment with core MAPbBr3 by embedding MAPbBr3 nanocrystals in the unreacted wider band gap MABr. A solvent-vacuum drying process was developed to preserve nanocrystals in the film, which realizes a fast photoluminescence lifetime of 3.9 ns along with negligible trapping processes. Based on a highly luminescent nanocrystalline MAPbBr3 thin film, a highly efficient green LED with a maximum external quantum efficiency of 8.21% and a current efficiency of 34.46 cd/A was demonstrated.",

author = "Lee, {Jin Wook} and Choi, {Yung Ji} and Yang, {June Mo} and Sujin Ham and Jeon, {Sang Kyu} and Lee, {Jun Yeob} and Song, {Young Hyun} and Ji, {Eun Kyung} and Yoon, {Dae Ho} and Seongrok Seo and Hyunjung Shin and Han, {Gil Sang} and Jung, {Hyun Suk} and Dongho Kim and Park, {Nam Gyu}",

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AU - Jeon, Sang Kyu

AU - Lee, Jun Yeob

AU - Song, Young Hyun

AU - Ji, Eun Kyung

AU - Yoon, Dae Ho

AU - Seo, Seongrok

AU - Shin, Hyunjung

AU - Han, Gil Sang

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In-Situ Formed Type i Nanocrystalline Perovskite Film for Highly Efficient Light-Emitting Diode

Abstract

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