졸-겔법에 의한 SrTiO3:Pr^3+ 형광체의 SiO2 및 Al2O3 코팅에 따른 발광특성

Luminescent Properties of SrTiO3:Pr^3 Phosphor Coated with SiO2 and Al2O3 by Sol-Gel Method

Field emission display(FED) is actively investigated in view of the development of full color flat-panel display, which can replace some cathode-ray tube(CRT). Thus, the development of new phosphors appropriate for FED is urgently needed and has been actively investigated. In this work, SrTiO3:Pr^{3+} phosphor was prepared by sol-gel method and the coating was applied by sol-gel method combined with sonication on these phosphor s surface into diluted precursor solution. It was found that very fine particles of coating material were formed on phosphor s surface. The luminescent intensity of SrTiO3:Pr^{3+} phosphor coated with SiO2 and Al2O3 was considerably increased without any noticeable change in color chromaticity. The optimum concentration of coating material was found to be 1wt% and the optimum pH value of the solution was 10.