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.

在这项研究中已经研究了碱 - 地球硅氧硝酸盐，CA-SI-O-N和BA-SI-O-N系统的合成条件。由于添加了稀土离子，主要是从其发光特性的角度检查所得粉末的性能。在这项研究中检查的氧硝基材料是CA_3SI_2O_4N_2，CA_2SI_30_2N_4和BASI_6ON_8。这项研究中使用的起始材料是碳酸钙（CACO_3），碳酸钡（BACO_3），氧化硅（SIO_2），硝酸硅（SI_3N_4）和稀有氧化物（= Activator; Eu_2O__________________3，yb_2o_3，yb_2o_3，ceo__2，tb__2，tb__2，tb__2，tb_4和CA_3SI_2O_4N_2（N/O比= 0.5）合成的条件（温度和时间）分别发现SIO_2和SI_3N_4制备的条件（N/O比= 0.5）分别为1450℃和2 h。检查了（CA__ <1-X> REX）_3SI_2O_4N_2（RE：REAR：RALE ERAIL ELEMERS）的发光特性。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分别指示红色和绿色发射。另一方面，获得CA_3SI_2O_2N_4（N/O比= 2.0）的单相，在1550℃中加热起始材料（CAO和SI_3N_4），持续2 h。（CA__ <1-X> EUX）3SI_2O_2N_4发射了红色的橙色光，其峰值波长从606转移到620 nm，x值从0.01增加到0.1.furthermore，furthermore，Basi_6on_8的单个阶段，获得了basi_6on_8的单个阶段，从而获得了启动材料（BACO_3，SIO_3，sio_2和sio_______________3n_44.44）。分别在363和480 nm左右观察到（ba_ <1-x> ce_x）si_6on_8的兴奋和发射峰。与CAWO_4作为标准物质的强度相比，SI_6ON_8的相对强度（BA_ <0.95> CE_ <0.05>）的相对强度为0.82。（ba_ <1-x> eux）si_6on_8的兴奋和发射峰分别在300 nm和500 nm处发现，显示了蓝绿色的发射。（BA_ <0.96> EU_ <0.04>）SI_6ON_8的相对强度已连接2.7。