Compositional study of borosilicate CsPbBr₃ perovskite nanocrystals embedded glass for chemically stable white LEDs

CsPbBr₃ perovskite nanocrystal embedded glasses (PNEGs) based on the borosilicate system were synthesized with varying compositions to obtain a chemically stable PNEG compared with a PNEG based on the germanate system. Photo-luminescence (PL) and structural characteristics were examined to find the proper heat-treatment conditions for high quantum efficiency under a 450 nm blue light emitting diode (LED) excitation. The CsPbBr₃ within the glass matrix was observed by transmission electron microscope (TEM). Comparative studies on the thermal, photonic and water stabilities of the obtained borosilicate PNEG with those of a germanate PNEG were carried out. The borosilicate CsPbBr₃ PNEG was employed as a green phosphor along with K₂SiF₆:Mn⁴⁺ as a red phosphor to compose a white LED with phosphor in silicone (PiS) and a remote PiS structure, whose color gamut was examined for display applications.