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Air-stable all-inorganic perovskite quantum dot inks for multicolor patterns and white LEDs

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Abstract

Recently, all-inorganic perovskite quantum dots (QDs) (CsPbX3, X = Cl, Br, I) as the emerging semiconductor materials have been intensively studied owing to superior optical properties. Currently, the strategy for preparation of inorganic perovskite QDs mainly focuses on the hot-injection method, but requires inert gas protection and is difficult to mass-produce. In this work, we developed a simple and low-cost strategy for preparing highly luminescent and air-stable all-inorganic perovskite QDs by directly heating perovskite precursors in octane in air. The emission wavelength of CsPbX3 perovskite QDs can be tunable from ultraviolet (UV) to infrared region by simply controlling their halide composition and display high PLQYs. Moreover, CsPbX3 perovskite QDs in octane can exist more than half a year in air and the film of CsPbX3 perovskite QDs also shows good thermal stability and air stability, especially high iodide-substituted CsPbBr3−xIx perovskite QDs. The CsPbX3 perovskite QDs can be easily blended with PDMS and used as color conversion layer on the blue LEDs chip for high-quality white LEDs. Our work opens a window for the potential application of such highly luminescent material in the fields of multicolor LEDs, backlight display and other related optoelectronic devices.

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Acknowledgements

This work was supported by National Science Foundation of China (Grant No. 11704206) and Research Fund Project of Ningbo University (Grant No. XYL18019) and also sponsored by K. C. Wong Magna Fund in Ningbo University.

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Authors and Affiliations

  1. The Department of Microelectronics Science and Engineering, Science Faculty, Ningbo University, Ningbo, China

    Wu Zhihai, Wei Jiao, Sun Yanni, Wu Jun, Hou Yafei, Wang Pan, Wang Nengping & Zhao Zhenfu

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  1. Wu Zhihai
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Correspondence to Zhao Zhenfu.

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Zhihai, W., Jiao, W., Yanni, S. et al. Air-stable all-inorganic perovskite quantum dot inks for multicolor patterns and white LEDs. J Mater Sci 54, 6917–6929 (2019). https://doi.org/10.1007/s10853-019-03382-2

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