As the output of solid-state lighting and light sources increases, the demand for transparent phosphor inorganic plates with excellent heat resistance is increasing. It is known that α-SiAlON, which has excellent heat resistance as engineering ceramics, shows photoluminescence by stabilized ions, but it is not possible to obtain α-SiAlON bulk single crystals. In this study, we fabricated transparent Y-α SiAlON:Ce³⁺ ceramics for use as wave conversion materials for high-power solid-state semiconductor light sources. For this purpose, gas pressure sintering, followed by hot isostatic pressing at lower temperatures, were carried out using homogeneous and dense green bodies. In particular, cyclic cold isostatic pressing increased the density and homogeneity of the green body, which promoted the densification at lower temperatures and the efficient disappearance of pores during sintering. As a result of the suppression of grain growth by low-temperature densification, Y-α SiAlON:Ce³⁺ ceramics with high in-line transmittance were successfully obtained. The transparent Y-α SiAlON:Ce³⁺ ceramics exhibited photoluminescence due to the 5d-4f transition of Ce³⁺. The peak wavelength of the emission intensity depended on the concentration of Ce³⁺, and the luminescence color was in the range of blue to blue-green.

随着固态照明和光源产量的增加，对具有优异耐热性的透明荧光粉无机板的需求越来越大。已知作为工程陶瓷具有优异耐热性的α- SiAlON通过稳定离子显示出光致发光，但不可能获得α- SiAlON块状单晶。在这项研究中，我们制造了透明的 Y- α SiAlON:Ce ³⁺陶瓷用作高功率固态半导体光源的波转换材料。为此，使用均质致密的生坯进行气压烧结，然后在较低温度下进行热等静压。特别是循环冷等静压提高了坯体的密度和均匀性，促进了较低温度下的致密化和烧结过程中气孔的有效消失。由于低温致密化抑制了晶粒生长，成功获得了具有高在线透射率的Y- α SiAlON:Ce ³⁺陶瓷。透明的 Y- α SiAlON:Ce ³⁺由于Ce ³⁺的5d-4f 跃迁，陶瓷表现出光致发光。发射强度的峰值波长取决于Ce ³⁺的浓度，发光颜色在蓝色至蓝绿色范围内。