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Synthesis of novel alkaline-earth silicon nitrides and evaluation from the viewpoint of materials science

新型碱土氮化硅的合成及材料科学评价

基本信息

批准号：
17560599
负责人：
ITATANI Kiyoshi
金额：
$ 2.39万
依托单位：
Sophia University
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (C)
财政年份：
2005
资助国家：
日本
起止时间：
2005 至 2007
项目状态：
已结题

项目摘要

The synthesis conditions of alkaline-earth silicon oxynitrides, Ca-Si-O-N and Ba-Si-O-N systems, have been investigated in this research; properties of the resulting powders were examined chiefly from the viewpoints of their luminescence characteristics due to the addition of rare-earth ions. The oxynitride materials examined in this research were Ca_3Si_2O_4N_2, Ca_2Si_30_2N_4 and BaSi_6ON_8. The starting materials used in this research were calcium carbonate (CaCO_3), barium carbonate (BaCO_3), silicon oxide (SiO_2), silicon nitride (Si_3N_4) and rare-earth oxide (= activator; Eu_2O_3, Yb_2O_3, CeO_2, Tb_4O_7 and Sm_2O_3).Firstly, the optimum conditions (temperature and time) for the synthesis of Ca_3Si_2O_4N_2 (N/O ratio = 0.5) prepared using CaO, SiO_2 and Si_3N_4 were found to be 1450℃ and 2 h, respectively. The luminescence properties of (Ca_<1-x>REx)_3Si_2O_4N_2 (RE: Rare earth element) were examined. Among these rare-earth doped compounds, (Ca_<1-x>Smx)_3Si_2O_4N_2 and (Ca_<1-x>Tbx) 3Si_2O_4N_2 indicated red and green emitting, respectively. On the other hand, the single phase of Ca_3Si_2O_2N_4(N/O ratio = 2.0) was obtained heating the starting materials (CaO and Si_3N_4) at 1550℃ for 2 h. The (Ca_<1-x>Eux)3Si_2O_2N_4 emitted the reddish orange light whose peak wavelength was shifted from 606 to 620 nm with increasing x value from 0.01 to 0.1.Furthermore, the single phase of BaSi_6ON_8 was obtained heating the starting materials (BaCO_3, SiO_2 and Si_3N_4) 1750℃ for 2 h. The excitation and emission peaks of (Ba_<1-x>Ce_x) Si_6ON_8 were observed at around 363 and 480 nm, respectively; the relative intensity of (Ba_<0.95>Ce_<0.05>) Si_6ON_8, compared to the intensity of CaWO_4 as a standard substance, attained 0.82. The excitation and emission peaks of (Ba_<1-x>Eux) Si_6ON_8 were found at around 300 and 500 nm, respectively, showing the blue-green emission. The relative intensity of (Ba_<0.96>Eu_<0.04>) Si_6ON_8 attained 2.7.

本文研究了Ca-Si-O-N和Ba-Si-O-N两种碱土氮氧化硅体系的合成条件，并从稀土离子的加入对粉末发光特性的影响方面对粉末的性能进行了研究。本研究中所测试的氮氧化物材料为Ca_3Si_2O_4N_2、Ca_2Si_3O_2N_4和BaSi_6ON_8。本研究以碳酸钙（CaCO_3）、碳酸钡（BaCO_3）、氧化硅（SiO_2）、氮化硅（Si_3N_4）和稀土氧化物为原料（=活化剂; Eu_2O_3，Yb_2O_3，CeO_2，Tb_4O_7和Sm_2O_3）。以CaO、SiO_2和Si_3N_4为原料合成Ca_3Si_2O_4N_2（N/O = 0.5）的最佳反应温度和反应时间分别为1450℃和2 h。研究了（Ca_<1-x>雷克斯）_3Si_2O_4N_2（RE：稀土元素）的发光性能。在这些稀土掺杂化合物中，（Ca_<1-x>Smx）_3Si_2O_4N_2和（Ca_<1-x>Tbx）_3Si_2O_4N_2分别显示红色和绿色发光。而以CaO和Si_3N_4为原料，在1550℃下加热2 h，得到了单相的Ca_3Si_2O_2N_4（N/O = 2.0）。（Ca_<1-x>Eux）_3Si_2O_2N_4发射红橙子光，其峰值波长随x值从0.01增加到0.1而从606移动到620 nm。（Ba_<1-x>Ce_x）Si_6ON_8的激发峰和发射峰分别位于363和480 nm附近，相对于CaWO_4的相对强度<0.95><0.05>为0.82。（Ba_ Eux）Si_6ON_8的激发峰和发射峰<1-x>分别位于300和500 nm附近，呈现蓝绿色发光。（Ba_<0.96>Eu_<0.04>）Si_6ON_8的相对强度达到2.7。