A Study on the Preparation of Submicron Phosphors Derived from Spray-Pyrolysis Route

• Main Author: 劉康權
• Other Authors: Teng-Ming Chen
• Format: Others
• Language: zh-TW
• Published: 2004
• Online Access: http://ndltd.ncl.edu.tw/handle/53719754221903786140

碩士 === 國立交通大學 === 應用化學系所 === 92 === To investigate the correlation among the conditions of chemical synthesis, microstructure, and luminescence properties, we have prepared both microcrystalline spherical Y3Al5O12:Ce3+ and LaPO4:Ce3+ phosphors with submicron size and non-aggregating characteristics via a two-step spray pyrolysis route. The cystallinity, microstructure, and photoluminescence (PL) properties of Y3Al5O12:Ce3+ and LaPO4:Ce3+ phosphors have been compared and investigated as a function of processing conditions. In particular, the microstructures of the above phosphors were investigated as a function of precursor concentrations, types of precursors, temperature, and reaction durations. Two series of spherical submicron-sized non-aggregating Y3Al5O12:Ce3+ and LaPO4:Ce3+ phosphors with decent crystallinity have been prepared at 1200℃ and 1100℃ via a two-step spray pyrolysis route, respectively. As indicated by the PL spectra, the excitation and emission bands for Y3Al5O12:Ce3+ and LaPO4:Ce3+ phosphors are not positively correlated with the processing temperatures, but closely related with the grain morphology and degree of aggregation of the phosphors. With thorough investigations we have obtained the optimal processing conditions for preparing Y3Al5O12:Ce3+ and LaPO4:Ce3+ phosphors, which can be further used as a reference for future scale-up production.