Synthesis and Characterization of BaMgAl10O17:Eu2+, Mn2+ for Submicron Phosphors
Date Issued
2008
Date
2008
Author(s)
Wang, De-Cheng
Abstract
BaMgAl10O17:Eu2+, Mn2+ phosphor particles with submicron size were directly prepared by wet ball milling from the commodity and synthesized by homogeneous precipitation process. Morphology, crystallinity, photoluminescence (PL) intensity, particle size and size distribution were investigated. The particle size of the commercial phosphor was reduced with increasing milling time. The particle size distribution was very sharp and the size of particle was about 170 nm after 3 hrs of milling time. It also was found that the crystallinity and the PL intensity of the phosphor were decreased obviously after ball milling. Post-annealing treatment was helpful to improve the PL intensity finitely. Dope Mn2+ into the milled commercial phosphor BaMgAl10O17:Eu2+ by using hydrothermal method was also tried to prepare the submicron phosphor particles of BaMgAl10O17:Eu2+, Mn2+. Unfortunately, it was not a practicable method due to few vacant sites in the original phosphor.wo reactors, the flask with a stopper and the autoclave, were used in homogeneous precipitation process. The particle size of the phosphor BaMgAl10O17:Eu2+, Mn2+ could be controlled by using this method with the autoclave. It was decreased with increase in aging temperature. The size of particle was about 100 nm at 95 °C of aging temperature. The best crystallinity of the phosphor was observed after 1400 °C calcination. But the PL intensity was proportional to the particle size.
Subjects
ball milling
homogeneous precipitation
Type
thesis
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