Compositional study of borosilicate CsPbBr3perovskite nanocrystals embedded glass for chemically stable white LEDs

CsPbBr3perovskite 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 CsPbBr3within 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 CsPbBr3PNEG 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.