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High stable CsPbBr3 quantum dots coated with alkyl phosphate for white light-emitting diodes

Abstract

Inorganic halide perovskite quantum dots (QDs) suffer from issues related to poor water stability and poor thermal stability. Here we developed a simple strategy to synthesize alkyl phosphate (TDPA) coated CsPbBr3 QDs by using 1-Tetradecylphosphonic acid both as ligand for the CsPbBr3 QDs and the precursor for the formation of alkyl phosphate. The QDs not only retain high photoluminescence quantum yields (PLQY, 68%), narrow-band emission (FHWM ~ 22nm) but also exhibit high stability against water and heat. The relative PL intensity of the QDs was maintained at 75% or 59% after being dispersed in water for 5 h or heated to 375 K (100 °C), respectively. Finally, white light-emitting diodes (WLEDs) with a high luminous efficiency of 63 lm/W and wide color gamut (122% of NTSC) were fabricated by using green-emitting CsPbBr3/TDPA QDs and red-emitting K2SiF6:Mn4+ phosphors as color converters. The luminous efficiency of the WLEDs maintained at 90% after working under a relative humidity (RH) of 60 % for 15 h, thereby showing promise for use in application in LCD backlight devices.

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Publication details

The article was received on 12 Jun 2017, accepted on 11 Sep 2017 and first published on 14 Sep 2017


Article type: Communication
DOI: 10.1039/C7NR04179A
Citation: Nanoscale, 2017, Accepted Manuscript
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    High stable CsPbBr3 quantum dots coated with alkyl phosphate for white light-emitting diodes

    T. Xuan, X. Yang, S. Lou, J. Huang, Y. Liu, J. Yu, H. Li, K. L. Wong, C. Wang and J. Wang, Nanoscale, 2017, Accepted Manuscript , DOI: 10.1039/C7NR04179A

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