摘要
用 BPO4 和稀土氧化物为原料 ,首次合成了铈、铽、钆共激活的硼磷酸钇绿色荧光粉 ,研究了基质中Ce3+ 、Tb3+ 、Gd3+ 的发光以及它们之间的相互作用。该基质中存在 Ce3+ → Tb3+ 、Gd3+ → Tb3+ 的能量传递 ,以及 Ce3+和 Gd3+ 之间的竞争吸收和独自发射。在铈、铽共激活的硼磷酸钇体系中掺入钆后 ,Ce3+ 的发射以及 Tb3+ 的 5D4 → 7FJ和 5D3→ 7FJ的发射均增强 ,但总的效果是 Gd3+ 阻碍了 Ce3+ → Tb3+ 的能量传递。基质中钇全部被钆代替后 ,荧光粉的发光亮度增加 ,光纯度也较好 ,发光色坐标 X值稍变小。
Green emitting phosphors of yttrium borophosphate doped with Ce 3+ ,Tb 3+ and Gd 3+ have been prepared by reaction of BPO 4 with rare earth oxides for the first time.The spectroscopic properties of Ce 3+ ,Tb 3+ and Gd 3+ and interaction among them have been also studied.There exist energy transfers of Ce 3+ →Tb 3+ and Gd 3+ →Tb 3+ ,and competitive absorption and individual emission between Ce 3+ and Gd 3+ .Ce 3+ emission and 5D 4→ 7F J and 5D 3→ 7F J emissions in Tb 3+ are enhanced with addition of Gd 3+ to yttrium borophosphate doped with Ce 3+ ,Tb 3+ ,but the intensity of Ce 3+ emission inceases more than that of Tb 3+ emission.In words,Gd 3+ prevents energy transfer from Ce 3+ to Tb 3+ .When yttrium in the substrate is replaced wholly by gadolinium,luminescence of phosphor is enhanced greatly and luminescence purity of the phosphor is relatively good,however,x value of chromatic coordinates lowers slightly.
出处
《稀土》
EI
CAS
CSCD
北大核心
2000年第3期14-18,共5页
Chinese Rare Earths
关键词
硼磷酸钇
能量传递
荧光粉
荧光灯
光谱特性
yttrium borophosphate
emission spectrum
excitation spectrum
energy transfer
