PREPARATION OF HIGHLY LUMINOUS MATERIALS THROUGH STABLE IMMISCIBILITY OF SILICATE GLASSES

利用硅酸盐玻璃稳定的不混溶性制备高发光材料

• 批准号: 16360333
• 负责人: YASUMORI ATSUO
• 金额: $ 8.06万
• 依托单位: TOKYO UNIVERSITY OF SCIENCE
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for Scientific Research (B)
• 财政年份: 2004
• 资助国家: 日本
• 起止时间: 2004 至 2006
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-16360333/
• 关键词: SILICATE GLASSES; IMMISCIBIRITY; PHASE SEPARATION; CRYSTALLIZATION; LUMINESCENCE; METASTABLE PHASE; MICRO STRUCTURE; MULTIPLE LIGHT SCATTERING; ユーロピウム; フレスノイト; ウィレマイト; アノーサイト; 安定不混和現象; 溶融法

High performance luminous materials are demanded in order to achieve much higher brightness and finer resolution in innovation of recent visual equipments like flat panel displays. The objective in this study was preparation of luminous materials having high durability against UV light and long-life stability of emission through stable immiscibility of silicate glasses. The selected glass compositions were Y_2O_3-SiO_2, CaO-Si0_2, ZnO-Si0_2, BaO-Ti0_2-Si0_2 systems, and a Na_2O-B_2O_3-SiO_2 one in metastable immiscibility region as reference. The phase separated glasses and the glass ceramics were obtained in stable immiscibility regions of all systems. The microstructures of the phase separation of the obtained glasses were controlled by their compositions, heat treatment temperatures and times. The increases of the emission intensity of the obtained materials were found in the particular compositions of the systems. From the relationships among the luminous properties, the phase sepa … More ration textures, the precipitated crystalline phases and the light scattering ability of the materials, the increase of the emission intensity was considered to be influenced by three effects written below :1. The effect of the precipitation of characteristic crystalline phase by the crystallization of the glass matrix, that is, the precipitation of metastable crystalline phases and their structural change (Especially, Y_2O_3-SiO_2, CaO-Si0_2, BaO-Ti0_2-Si0_2).2. The effect of characteristic precipitation of crystalline phase and their growth which originated in the fine texture of phase separation in the glass matrix (Especially, ZnO-Si0_2, BaO-Ti0_2-Si0_2).3. The effect of multiple light scattering due to the fine phase separation texture and/or fine crystal precipitates in the glass matrix (all systems).These effects indicate that the phase separated glasses and the glass ceramics have a potential of the increase of emission intensity, and become guides to achieve the highly luminous materials. Less

在平板显示器等现代视觉设备的创新中，为了实现更高的亮度和更精细的分辨率，需要高性能的发光材料。本研究的目的是通过硅酸盐玻璃的稳定不混溶，制备出对紫外光具有高耐久性、发射具有长寿命稳定性的发光材料。所选玻璃组成为Y_2O_3-SiO_2、CaO-SiO_2、ZnO-SiO_2、BaO-TiO_2-SiO_2系统，并以亚稳不相区的Na_2O-B_2O_3-SiO_2系统为参照物。在所有体系的稳定不混相区都得到了分相玻璃和微晶玻璃。玻璃的成分、热处理温度和时间控制了玻璃分相的微观结构。得到的材料的发射强度随体系组成的不同而增大。从发光性质之间的关系来看，SEPA…相由于材料较多的定量织构、析出晶相和光散射能力，发光强度的提高主要受以下三方面的影响：1.玻璃基质析晶对特征晶相析出的影响，即亚稳晶相的析出及其结构变化(特别是Y_2O_3-SiO_2、CaO-SiO_2、BaO-TiO_2-SiO_2)。玻璃基质(尤其是ZnO-SiO_2，BaO-TiO_2-SiO_2)中晶相的特征析出及其生长的影响源于分相的细微织构。由于玻璃基质(所有体系)中有细小的分相织构和/或细小的晶相析出而产生的多次光散射效应，这些效应表明分相玻璃和微晶玻璃具有提高发光强度的潜力，并成为实现高发光材料的导向器。较少

项目成果

Eu-doped CaAl2Si2O8 nanocrystalline phosphors crystallized from the CaO-Al2O3-SiO2 glass system

• DOI: 10.1149/1.2712834
• 发表时间: 2007-01-01
• 期刊: JOURNAL OF THE ELECTROCHEMICAL SOCIETY
• 影响因子: 3.9
• 作者: Ohgaki, Takeshi;Higashida, Akihisa;Yasumori, Atsuo
• 通讯作者: Yasumori, Atsuo