Luminescence property and phase-separation texture of phase-separated glasses and glass-ceramics in Mn-Doped ZnO-SiO2 System

Abstract

In order to achieve fine phosphor materials with high efficiency, phase-separated glasses and glass-ceramics in Mn-doped ZnO-SiO2 system, of which composition was xZnO-(100-x)SiO2mol% (x: =10, 20, 30) in the immiscibility region, were prepared by melting and subsequent heat-treatment process. All the melt-quenched glasses were phase-separated into two phases, i.e. a ZnO-rich phase and a SiO2-rich one. The SiO 2-rich particles were formed into the ZnO-rich phase in the composition of x = 20 and x = 30, while the ZnO-rich particles were formed in the SiO2-rich phase in the composition of x = 10. The melt-quenched glass showed the orange-emission at around 625 nm of its peak wavelength. After the heat-treatment on the melt-quenched glasses, the Zn2SiO 4 (willemite) phase were precipitated, and the glass-ceramics gave strong green-emission at around 525 nm. The intensity of the green-emission of the glass-ceramics in the composition of x = 10 was higher than those in the composition of x =20 and x = 30 in spite of the same amount of precipitated Zn2SiO4 phase.