High loading Cs4PbBr6@PMMA perovskite particles for high-transmittance, ultra-stable and efficient luminescent solar concentrators

Conventional perovskite nanocrystals (PNCs)-based luminescent solar concentrators (LSCs) suffer low loading, reduced transparency and poor moisture/oxygen/light/ thermal stability. To solve the above issues, in this work, we report the preparation of Cs 4 PbBr 6 @PMMA perovskite particles for the first time, which exhibit a green luminescence with emission wavelength of 517 nm and a photoluminescence quantum yield (PLQY) of 32.9 %. The prepared Cs 4 PbBr 6 @PMMA perovskite particles are utilized as fluorescent materials while the PMMA serve as a waveguide material for fabrication of single-layer LSCs. On one hand, the Cs 4 PbBr 6 @PMMA perovskite particles are well-dispersed in the PMMA, demonstrating excellent compatibility and good transparency at high loading (>60 % over 600 nm at the loading of 39.3 wt%). Furthermore, the single-layer LSCs exhibit external optical efficiency ( η opt ) from 2.26 % to 3.50 % with increased loading from 14.0 % to 39.3 wt%. On the other hand, the surface-grafted PMMA provides robust protection for the perovskite particles, significantly improving the stability of the LSCs. The LSCs can retain over 90 % of their initial η opt after two weeks under harsh conditions of high relative humidity (RH = 90 %) and high temperature (60 °C) and sunlight exposure. The single-layer LSCs also maintain over 81.9 % of their initial η opt after 10 months under indoor daylight storage conditions.