Color-stable highly luminescent sky-blue perovskite light-emitting diodes

Nature Communications
Jun XingEdward H Sargent

Abstract

Perovskite light-emitting diodes (PeLEDs) have shown excellent performance in the green and near-infrared spectral regions, with high color purity, efficiency, and brightness. In order to shift the emission wavelength to the blue, compositional engineering (anion mixing) and quantum-confinement engineering (reduced-dimensionality) have been employed. Unfortunately, LED emission profiles shift with increasing driving voltages due to either phase separation or the coexistence of multiple crystal domains. Here we report color-stable sky-blue PeLEDs achieved by enhancing the phase monodispersity of quasi-2D perovskite thin films. We selected cation combinations that modulate the crystallization and layer thickness distribution of the domains. The perovskite films show a record photoluminescence quantum yield of 88% at 477 nm. The corresponding PeLEDs exhibit stable sky-blue emission under high operation voltages. A maximum luminance of 2480 cd m-2 at 490 nm is achieved, fully one order of magnitude higher than the previous record for quasi-2D blue PeLEDs.

References

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Citations

Apr 24, 2019·Advanced Materials·Azhar FakharuddinLukas Schmidt-Mende
Jun 11, 2019·Nanoscale·Fei Yan, Hilmi Volkan Demir
Nov 28, 2019·Advanced Materials·Siyuan LiXiaosheng Fang
Oct 9, 2019·Advanced Materials·Lu ChengJianpu Wang
Sep 5, 2020·Advanced Materials·Ji-Eun JeongHan Young Woo
Dec 19, 2019·Nature Communications·Tianjun LiuOliver Fenwick
Jul 8, 2020·Nature Nanotechnology·Yitong DongEdward H Sargent
Jun 12, 2019·Dalton Transactions : an International Journal of Inorganic Chemistry·Cheng-Yang YueXiao-Wu Lei
Apr 25, 2019·Nature Communications·Yuanzhi JiangJun Chen
Oct 23, 2019·Nanomaterials·Calum McDonaldVladimir Svrcek
May 29, 2020·Advanced Materials·Huiwang LianGang Han
Dec 12, 2019·Nature Communications·Qi WangJinsong Huang
Dec 23, 2020·Advanced Materials·Joao M PinaEdward H Sargent
Jan 16, 2021·Accounts of Chemical Research·Sara R SmockRichard L Brutchey
Jan 28, 2021·ACS Applied Materials & Interfaces·Jiahui HouShikuan Yang
Feb 12, 2021·The Journal of Physical Chemistry Letters·Lei CaiBaoquan Sun
Mar 11, 2021·The Journal of Physical Chemistry Letters·Yuanzhi JiangMingjian Yuan

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Methods Mentioned

BETA
atomic force microscopy
AFM
scanning electron microscopy

Software Mentioned

MPRelaxSet
Vienna ab initio simulation package ( VASP )
Pymatgen Python package

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