Abstract
Synthesis of precursor fine particle of Eu3+-doped yttrium oxide phosphor (Y2O3 : Eu) from homogeneous solution using urea as a precipitant generator with and without addition of nucleus fine particle and effect of solution temperature for the size and shape of precipitated particle was investigated. Particle size and shape were influenced by the solution temperature on precipitation reaction. The average size of spherical particle changed from 280 nm with decreasing in solution temperature from 77°C to 97°C on nucleation stage of precipitation reaction. At the low temperature of 74～84°C, non-spherical (plate-like) particle was precipitate with spherical particle, while spherical particle was only precipitated at the high temperature of 97°C. By adjusting an addition of fine colloidal particle to a stock solution as nucleus of the precipitation, it is possible to control the number and size of the final products. The average size of spherical particle changed from 523 nm to 968 nm with decreasing in quantity of nucleus particle.
