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Highly Luminescent and Stable Halide Perovskite Nanocrystals Ye Wu, Xiaoming Li, and Haibo Zeng ACS Energy Lett., Just Accepted Manuscript • DOI: 10.1021/acsenergylett.8b02100 • Publication Date (Web): 01 Feb 2019 Downloaded from http://pubs.acs.org on February 7, 2019
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ACS Energy Letters
Highly Luminescent and Stable Blue Halide Perovskite Nanocrystals Ye Wu, Xiaoming Li,* Haibo Zeng*
MIIT Key Laboratory of Advanced Display Materials and Devices, Institute of Optoelectronics & Nanomaterials, College of Materials Science and Engineering, Nanjing University of Science and Technology. Nanjing 210094, China
AUTHOR INFORMATION Corresponding Author *(X.L.) Email:
[email protected], *(H.Z.) Email:
[email protected].
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ABSTRACT Lead halide perovskites are potential candidates for wide-color-gamut display applications. Recently, red and green light-emitting diodes (LEDs) based on these materials have achieved external quantum efficiency (EQE) of over 20% while the blue devices lag behind them severely because of much lower photoluminescence quantum yield (PL QY) and inferior stability. Blue perovskite nanocrystals (NCs) are promising active materials for high efficiency devices, however, they are reported to exhibit low defect tolerance and suffer from troublesome ion migration behavior. Though some good ideas have been proposed to overcome these problems, the present results are still unsatisfactory. In this perspective, diverse methods toward blue perovskite NCs are summarized, as well as the intrinsic origin of low stability and poor optical properties. Then, strategies to improve their performance and stability, and critical challenges that severely limit the stability and performances of blue perovskite NCs are discussed. Perspectives of further developments both on synthesis and applications of blue perovskite NCs are also provided. TOC GRAPHICS
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ACS Energy Letters
Halide perovskites have gone through unprecedentedly rapid progress for electroluminescence (EL) applications within several years. The record external quantum efficiencies (EQE) are over 20% for green, red and near-infrared (NIR) regions with different device optimization strategies.1-3 Despite the great success of green or NIR halide perovskite light-emitting diodes (LEDs), blue emitting devices have become the key shortcoming for the wide-color-gamut display fields. For polycrystalline film LEDs, large efforts should be paid to improve the monodispersity with desired ion spatial distribution and realize highly efficient pure blue luminescence with λPL
