摘要
采用溶胶-凝胶法在室温下制备了稀土Tb3+掺杂的以BaO-3SiO2为基质的发光材料,通过DTA-TG、IR、XRD、SEM、激发和发射光谱图对材料的结构和发光性能进行了研究。DTA-TG测试表明,615℃时材料发生晶型转变;IR光谱显示,材料除形成Si-O-Si键外,主要形成Ba-O-Si和Ba-O键;XRD进一步测试证明,主要形成BaSiO3晶体结构。SEM显示,晶体呈四面体和多面体颗粒结构。激发和发射光谱图显示,Tb3+在BaO-3SiO2基质中的掺杂量为2.50mol%,退火温度为800℃,即材料主要以BaSiO3晶体存在时发光最好。即在544 nm监测波长下,测得的最佳激发波长为紫外光248 nm,即在248 nm光激发下,材料发射强度高、单色性好的绿光。
Tb3＋ doped BaO-3SiO2 luminescent materials was preparated by the sol-gel method. The crystal structure and the luminescent properties of the samples were characterized by DTA-TG, IR, XRD, SEM and excitation and emission spectra, respectively. The DTA-TG indicated that one large weight loss between 100-200 ℃, which was attributed to the volatilization of water and organic matter. The crystal structure transformed, due to one weight loss and one weak exothermie peak were observed when the temperature was 615 ℃. IR spectra showed that the samples are mostly composed of the Ba-O-Si ,Si-O- Si and Ba-O bonds. Powder XRD analysis indicated that the mainly exist BaSiO3 erystal structure. SEM of samples showed that form grain structure of tetrahedron and polyhedron. The excitation and emission spectra showed that the best annealing temperature is 800 ℃ for preparing material and the optimum doping amount of Tb3＋ is 2.50mo1%. It also showed that the best excitation light is the ultraviolet light with the wavelength of 248 nm when the wavelength of the monitoring light is 544 nm, that is to say, the monochromaticity and the emission intensity of green lights excited from the samples are optimum when the wavelength of the excitation light is 248 nm.
出处
《人工晶体学报》
EI
CAS
CSCD
北大核心
2013年第8期1561-1567,共7页
Journal of Synthetic Crystals
基金
内蒙古自治区自然科学基金(2010MS0205)
内蒙古师范大学科研创新基金(ZRYB09004)
国家自然科学基金(20161001)
