Excitation wavelength and Eu3+/Tb3+ content ratio dependent tunable photoluminescence from NaSrBO3:Eu3+/Tb3+ phosphor
Excitation wavelength and Eu3+/Tb3+ content ratio dependent tunable photoluminescence from NaSrBO3:Eu3+/Tb3+ phosphor
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DOI：
10.1007/s10854-019-01533-4
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发表时间：
2019-06
期刊：
影响因子：
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通讯作者：
A. K. Bedyal;D. Ramteke;Vinay Kumar;H. Swart
中科院分区：
文献类型：
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作者：
A. K. Bedyal;D. Ramteke;Vinay Kumar;H. Swart
采用溶液燃烧法合成了一系列单掺杂（Eu 3+或Tb 3+）和共掺杂（Eu 3+和Tb 3+）的荧光粉。由于Tb 3+和Eu 3+离子的特征4f-4f跃迁，单掺杂的NaSrBO 3：Tb 3+和NaSrBO 3：Eu 3+在各自的激发波长下分别发射绿色和红色发射。而在Tb 3+激发下，共掺杂NaSrBO 3：Tb 3 +/Eu 3+荧光粉由于Tb 3+向Eu 3+的能量转移，通过改变Eu 3 +/Tb 3+的含量比，表现出可调谐的发光。相反，共掺杂磷光体的发射光谱也表现出对240至394 nm范围内的激发波长的强烈依赖性。随着激发波长的增加，发射颜色（绿-黄-红）的变化归因于材料中存在多种状态的Eu 3+和Tb 3+离子，其在不同的激发波长下变得活跃。在Eu 3+和Tb 3+激发态寿命的框架下研究了能量传递机制和发光动力学。结果表明，该荧光粉具有良好的光电性能。
A series of single doped (Eu3+or Tb3+) and codoped (Eu3+and Tb3+) phosphors were synthesized by solution combustion method. The single doped NaSrBO3:Tb3+and NaSrBO3:Eu3+emit green and red emission due to the characteristic 4f–4f transition of the Tb3+and Eu3+ions, respectively, under respective excitation wavelengths. Whereas, under Tb3+excitation, the co-doped NaSrBO3:Tb3+/Eu3+phosphors showed tunable emission upon varying the Eu3+/Tb3+content ratio ascribed due to the energy transfer from Tb3+to Eu3+ions. Instead of this the emission spectrum of the codoped phosphors also exhibited strong dependence on the excitation wavelength in the range from 240 to 394 nm. The shift in the emission color (green–yellow–red) with increasing excitation wavelength, had been attributed to the presence of multiple states of Eu3+and Tb3+ions in the material, that become active at different excitation wavelength. The energy transfer mechanism and luminescence dynamics were investigated in the framework of the lifetime of the excited states of Eu3+and Tb3+. The results imply that the present phosphor with multicolor emission might be promising for optoelectronic applications.