Publication date: 15th July 2022
Lead halide perovskite (LHP) nanocrystals (NCs) have recently emerged as one of the most interesting materials due to their outstanding optical properties, such as tunable photoluminescence (PL), narrow PL emission and high PL quantum yield values.[1, 2] Until now, the exploitation of LHP NCs in optoelectronic device has been mainly hindered by the low stability (against heat, humidity and light irradiation) of such materials.[3] To protect such NCs from the external environment, we successfully developed a molten salts approach capable not only of encapsulating CsPbBr3 NCs (together with KNO3, NaNO3 and KBr) inside mesoporous SiO2 (m-SiO2) nanoparticles, but also to seal the pores of the latter, burying, in practice, the LHP NCs inside.[4] By employing m-SiO2 particles of different size, we could produce CsPbBr3/m-SiO2 composites with dimensions ranging from 100nm to ≥600nm.[5] Our analyses indicated that 100nm-sized CsPbBr3/m-SiO2 composites feature the best stability against humidity, light irradiation and heat up to 1000 hours, and exhibit a green (peaked at 517nm) narrow photoluminescence (full width at half maximum of 18nm) with high quantum yield (77%). Due to their outstanding properties, such composites were tested as green phosphors for down conversion liquid crystal displays (LCDs). The resulting proof of concept 7 inch-LCD featured an optimal white emission (with correlated color temperature of 6861 K), that is close to the reference white point of NTSC, and covers 92% of NTSC standard color gamut area of CIE1931, higher than that of a reference commercial LCD (Dell XPS 15 7590 laptop). Our composites are therefore ideal candidates for displays and represent a step forward for the implementation of perovskite nanocrystals in actual devices.
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