Preparation of long-lasting transparent glass-ceramic phosphor

长效透明微晶玻璃荧光粉的制备

基本信息

批准号：
11555167
负责人：
MIURA Yoshinari
金额：
$ 7.3万
依托单位：
OKAYAMA UNIVERSITY
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (B)
财政年份：
1999
资助国家：
日本
起止时间：
1999 至 2002
项目状态：
已结题

来源：
https://kaken.nii.ac.jp/en/grant/KAKENHI-PROJECT-11555167/
关键词：
long-lasting phosphors transparent glass-ceramics alkaline-earth aluminum oxides akermanite crystals rare earth ions crystallizing heat-treatment at reducing condition glass-melting at reducing condition ultrasonic surface treatment (UST)

项目摘要

The preparation of the transparent glass-ceramics with long lasting phosphorescence (LLP) was tried by precipitation of crystals from glassy materials by means of various experimental methods. The glass-ceramics containing calcium aluminate crystals co-doped with Eu^<2+> and Nd^<3+> or akermanite (strontium magnesium silicate) type crystals co-doped with Eu^<2+> and Dy^<3+>. The glass in the system 45CaO・45Al_2O_3・10SiO_2 (mol%) containing 0.5Eu_2O_3+1Nd_2O_3 showed very weak LLP property due to glassy state even though Eu ions were effectively reduced to Eu^<2+> ion state by melting the glass with reducing agents like sugar or graphite. Therefore to keep a certain crystal state is necessity to excellent LLP property. The effects of ultrasonic surface treatment (UST) on the crystallization behavior and optical emission properties were investigated for the transparent glass-ceramics prepared from calcium aluminosilicate glasses co-doped with Eu^<2+> and Nd^<3+>. The glass-ceramics A wer … More e prepared by sintering a glass 45CaO・45Al_2O_3・10SiO_2 (mol%) containing O.5Eu_2O_3+1Nd_2O_3 under a 2%H_2+98%Ar reducing atmosphere. In the glass-ceramics A, three crystalline phases, CaAl_2O_4(CA), CaAl_4O_7(CA2) and Ca_2Al_2SiO_7(CAS) were commonly confirmed by X-ray diffraction. No drastic change in the amount of the precipitated crystalline phases was observed even in the case using UST of CA powders. It was suggested that the optical emission properties of the glass-ceramics A was responsible for the CA2 crystals. The glass-ceramics B were also prepared from a 51CaO・42Al_2O_3・7SiO_2 glass. The CA crystals were separately precipitated in the glass-ceramics B. In particular, a large amount of CA was successfully produced by stirring the UST suspension to prevent the sedimentation of the UST particles. The glass-ceramic B so-prepared showed strong photoluminescence but weak phosphorescence compared with other glass-ceramics B, indicating that the photoluminescence and phosphorescence were originated in different electron-trapping levels. The amount of the trap levels associated with the long lasting phosphorescence, such as oxygen vacancies, was probably small in the glass-ceramic B prepared with the stirring UST. When the glasses were melted with reducing agent like sugar and partially crystallized under a reducing atmosphere glass-ceramics showed excellent LLP properties. The glass-ceramics with LLP precipitated akermanite type crystals co-doped with Eu^<2+> and Dy^<3+> were also obtained by melting and crystallizing under reducing conditions. Less

通过各种体验方法，通过玻璃晶体的晶体进行了透明的玻璃陶瓷（LLP）的制备。 +>或akermanite（硅酸盐镁镁）与Eu^<2+共掺杂的晶体> ^<2+>糖或石墨等糖。与Eu^<2+>共同掺杂的铝硅酸盐眼镜和ND^<3+>。玻璃镜头A中的大气，CAAL_2O_7（CA2）和CA_2AL_2SIO_7（CAS）通常被X射线衍射率确认人们认为战争的玻璃陶瓷是从51 CAO ・ 42AL_2O_3 ・7SIO_2玻璃中的CA晶体分开。 usticle的沉积物。与其他玻璃陶瓷B光致发光和磷光相比，相比之下，屁股陶瓷b比较弱的磷光。玻璃陶瓷b用糖的ust制备。也通过降低条件下的熔化和结晶而获得