[18a-WL2_101-1~11] 13.8 Optical properties and light-emitting devices

11:15 AM - 11:30 AM JST(2:15 AM - 2:30 AM UTC)

[18a-WL2_101-9] Synthesis of Silicate Phosphors by a Novel CVD Technique

〇Kenji Toda¹, Wataru Hikita¹ (1.Niigata Univ.)

Keywords:

Phosphor,Silicon monooxide,CVD

In this presentation, we report a new CVD technique for silicate phosphors using SiO as a raw material. Vaporization of SiO was performed at over 1673 K from silica source (or SiO powder) in Ar/H₂ reduction atmosphere. In this method, well-grown powders with micrometer size were mainly obtained because of relatively slow nucleation. As an example, the green-emitting Ba₂SiO₄:Eu²⁺ phosphor can be synthesized by the new solid-vapor phase technique. Emission intensity of the Ba₂SiO₄:Eu²⁺ phosphor obtained using this method at 1723 K is approximately 2.6 times higher than that of phosphor synthesized by the conventional solid-state reaction method.This is due to high crystallinity and relatively few defects.