The
instability of all-inorganic perovskites and poor understanding
of the photoluminescence mechanisms have hindered their practical
applications. While a large body of work on 3-D perovskite phases
is available in the literature, the promising zero-dimensional (0-D)
phase perovskite materials are still poorly understood. Herein, we
report a new synthesis method for the production of 0-D Cs4PbBr6 perovskite quantum dots (QDs) in glass using a combination
of Cs2CO3 concentration and heat-treatment temperature
optimization. The differences in structure, morphology, and photoluminescence
(PL) between the 0-D Cs4PbBr6 QDs and the 3-D
CsPbBr3 QDs in glass were studied in detail. Cs4PbBr6 QD glass with high transmittance displayed a blue-shift
PL emission centered at 503 nm, a narrow full width at half-maximum
(fwhm, ∼20 nm), a high photoluminescence quantum yield (PLQY,
∼22%), and excellent long-term stability, thereby, advancing
the study of these materials. It was demonstrated that Cs4PbBr6 displayed unique luminescent properties in correlation
with the intrinsic defect states in the mid-band gap.
TiO2-SiO2 is a kind of binary component glass material with excellent properties such as high heat impact resistance, welding ability, and the size of the material is insensitive to temperature change. Based on the principle of Chemical Vapor Deposition (CVD), we used silicon tetrachloride and titanium tetrachloride as the raw materials for the preparation of this glass. In this research, we studied the morphology, structure, and particle size distribution of TiO2-SiO2 binary glass particles. The experimental results show that the deposition particles are spherical amorphous nanoparticles with a size of about 100nm, and there is no SiO2 or TiO2 crystalline phase in the particles. This particle structure overcomes the characteristic that TiO2 is easily crystallized in other preparation methods, making preparation for TiO2-SiO2 binary glass possible.
scite is a Brooklyn-based organization that helps researchers better discover and understand research articles through Smart Citations–citations that display the context of the citation and describe whether the article provides supporting or contrasting evidence. scite is used by students and researchers from around the world and is funded in part by the National Science Foundation and the National Institute on Drug Abuse of the National Institutes of Health.