Journal
LASER & PHOTONICS REVIEWS
Volume 15, Issue 10, Pages -Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/lpor.202100278
Keywords
CsPbBr3 nanocrystals; stability; visible light communication; white light-emitting diodes; ZrO2
Categories
Funding
- National Natural Science Foundation of China [11974063]
- Fundamental Research Funds for the Central Universities [2019CDJGFGD001]
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A facile method to synthesize CsPbBr3@ZrO2 NCs at room temperature in air is reported, enhancing optical performance and stability by using ZrO2 coated CsPbBr3 NCs. The fabricated WLEDs exhibit high correlated color temperature and luminous efficacy, and achieve visible light communication with a high data rate.
The photoluminescence quantum yield (PLQY) of CsPbBr3 perovskite nanocrystals (NCs) prepared by the hot-injection method can exceed 90%, which have attracted intensive attention for white light-emitting diodes (WLEDs). However, the whole hot-injection experiment requires air isolation and relatively high temperature. In addition, the poor stability of CsPbBr3 NCs impedes their applications. Here, a facile method is reported to synthesize CsPbBr3@ZrO2 NCs at room temperature in air. Owing to using ZrO2 coated CsPbBr3 NCs, the prepared CsPbBr3@ZrO2 NCs not only present a PLQY of 80% but also exhibit an enhanced stability to heat and moisture. Furthermore, WLEDs are fabricated with CsPbBr3@ZrO2 NCs and commercial red phosphors (CaAlSiN3:Eu2+) on blue LEDs chips. The fabricated WLEDs exhibit a correlated color temperature (CCT) of 4743 K and luminous efficacy as high as 64.0 Lm W-1. In addition, visible light communication with a high data rate of 33.5 Mbps is achieved using the WLEDs. This work provides a room temperature strategy to coat zirconia for CsPbBr3@ZrO2 NCs, benefiting to enhance the optical performance and stability, as well as the promotion of the great potentials in solid-state illuminating and visible light communication applications.
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