摘要
采用高温固相法在还原气氛下合成了3Al2O3.2SiO2:Eu2+,Tb3+莫来石发光材料,通过荧光光谱分析探讨了发光特性及Eu,Tb之间的能量转移过程.研究结果表明,Tb3+的主发射峰由5D4→7FJ(J=4~6)跃迁产生;当Eu2+和Tb3+共存于3/2-莫来石基质中时,Eu2+对Tb3+具有很强的敏化作用,Eu2+通过电多极相互作用将能量传递给Tb3+,使得Tb3+的特征发射显著增强,其临界传递距离R0为0.9nm.与Tb单掺杂时的莫来石样品相比,Eu,Tb共掺杂的3/2-莫来石荧光体的绿色发射得到极大的提高,最佳配比为3Al2O3.2SiO2:0.05Eu,0.05Tb.
The 3Al2O3·2SiO2: Eu^2+, Tb^3+ phosphor was prepared by solid-state reaction at a high temperature under the reducing atmosphere. The luminescence characteristics and the energy transfer between Eu^2+ and Tb^3+ were discussed by means of the spectrofluoromet. The results indicated that the Tb^3+ emission is mainly from ^5D4→^7FJ (J = 4-6) transitions and possible to be sensitized by Eu^2+ in 3/2-mullite hosts. The observed strong enhancement of the Tb^3+ emission for introducing Eu^2+ content is attributed to the energy transfer effect from Eu^2+ to Tb^3+ through the electric multipolar interaction. The critical transfer distance (R0) is 0.9 nm. Compared with Tb-doped 3/2-mullite, the luminescence intensity of Eu, Tb co-doped 3/2-mullite phosphor was significantly improved. The optimum proportion of Eu, Tb co-doped 3/2-mullite is found to be 3Al2O3·2SiO2:0.05Eu, 0.05Tb.
出处
《科学通报》
EI
CAS
CSCD
北大核心
2009年第5期569-573,共5页
Chinese Science Bulletin
关键词
莫来石
光致发光
铕
铽
能量传递
mullite, photoluminescence, europium, terbium, energy transfer