4.7 Article

High stability of silica-wrapped CsPbBr3 perovskite quantum dots for light emitting application

Journal

CERAMICS INTERNATIONAL
Volume 46, Issue 3, Pages 3882-3888

Publisher

ELSEVIER SCI LTD
DOI: 10.1016/j.ceramint.2019.10.114

Keywords

Perovskite QDs; CsPbBr3; SiO2; Stability; White LED

Funding

  1. Science and Technology Planning Project of Zhejiang Province [2018C01046]
  2. Enterprise-funded Latitudinal Research Projects of China [J2016-141, J2017-171, J2017-293, J2017-243]
  3. Shanghai Sailing Program [18YF1422500]
  4. Shanghai Institute of Technology [YJ2018-9]

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Encapsulating quantum dots (QDs) into other medium has been considered as an efficacious method to avoid the fluorescence degradation of QDs. Here, we proposed a facile method to embed CsPbBr3 perovskite QDs in silica matrix derived from (3-aminopropyl)triethoxysilane (APTES) at room temperature in open air. The QDs/SiO2 composite was extracted from the sol-gel solution by using a precipitation-encapsulation method assisted with APTES. As-prepared composite powder possess a high photoluminescence quantum yield (PLQY) of 68% and a full width at half maximum (FWHM) of similar to 23 nm. The QDs/SiO2 compounds show excellent stability after the five heating cycles (105 degrees C) and a continuous xenon irradiation (500 W, 70 degrees C). Besides, the products remain 94.3% and 98.6% photoluminescence (PL) intensity after 30 days of storage (25 degrees C) and 96 h of ultraviolet (UV) irradiation (lambda = 365 nm) respectively. The white light-emitting diode (LED) was fabricated by coating greenemitting CsPbBr3 @SiO2 composite powder and commercial red phosphors on blue chip. The fabricated white LED performed excellent light characteristics with a luminous efficacy (eta(L)) of 58.9 ImW(-1) and a correlated color temperature (CCT, T-c) of 5829 K (current = 20 mA), it also display a wide color gamut with 126.8% of National Television System Committee (NTSC) color triangle area.

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