Synthesis and luminescence properties of BaWO4:Sm3+, Mo6+/K+ red phosphor
Synthesis and luminescence properties of BaWO4:Sm3+, Mo6+/K+ red phosphor
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BaWO4:Sm3、Mo6/K红色荧光粉的合成及发光性能
DOI：
10.1007/s10854-015-3288-5
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发表时间：
2015
期刊：
影响因子：
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通讯作者：
XiaoguangYu
中科院分区：
文献类型：
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作者：
RenpingCao;HaidongXu;DedongPeng;QingdongGou;ShenlinZhou;PanLiu;XiaoguangYu
采用高温固相反应法在空气中合成了BaWO 4：Sm 3+，Mo 6 +/K+荧光粉。峰位于~600和644 nm的强发射带和峰位于~403 nm的最强激发带分别归属于Sm ~（3+）离子的4G 5/2→ 6 HJ（J = 7/2和9/2）和6 H5/2→ 4F 7/2跃迁。Sm ~（3+）的最佳掺杂浓度为~ 5mol%。当K+离子作为电荷补偿剂时，由于电荷补偿作用，BaWO 4：Sm 3+荧光粉的发光强度提高了一倍以上，而Mo 6+离子对其发光强度影响不大。利用WO 42 −基团和Sm ~（3+）离子的能级图解释了能量转移和发光机理。Ba0.925WO4：0.05Sm ~（3+）、Ba0.925W0.9Mo0.1O4：0.05Sm ~（3+）和Ba0.9K0.05WO4：0.05Sm ~（3+）荧光粉在403 nm激发下的寿命分别为0.933、0.882和0.693 ms。实验结果表明，BaWO 4：Sm 3+，Mo 6 +/K+荧光粉有望成为近紫外（~403 nm）白色LED芯片用红色荧光粉的候选材料，其研究内容对提高Sm 3+掺杂荧光粉的发光性能具有重要意义。
BaWO4:Sm3+, Mo6+/K+phosphors are synthesized by a high temperature solid-state reaction method in air. The very strong emission bands peaking at ~600 and 644 nm and the strongest excitation band peaking at ~403 nm are assigned to the4G5/2→6HJ(J = 7/2 and 9/2) and6H5/2→4F7/2transitions of Sm3+ion, respectively. The optimal Sm3+doping concentration is ~5 mol%. Emission intensity of BaWO4:Sm3+phosphor is increased more than twice owing to charge compensation when the K+ion is codoped as charge compensator, however, Mo6+ions is small influence to its emission intensity. The energy transfers and luminous mechanism are explained by using energy level diagrams of WO42−group and Sm3+ion. Lifetimes of Ba0.925WO4:0.05Sm3+, Ba0.925W0.9Mo0.1O4:0.05Sm3+, and Ba0.9K0.05WO4:0.05Sm3+phosphors with excitation 403 nm are about 0.933, 0.882, and 0.693 ms, respectively. The experiment results indicate that BaWO4:Sm3+, Mo6+/K+phosphors will be a potential red phosphor candidate for white LEDs based on near UV (~403 nm) LED chip and research contents are useful to improve luminescence properties of Sm3+-doped phosphors.