CaWO_4∶xEu~(3+),ySm~(3+),zLi~+红色荧光粉的制备及光学性能
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摘要
采用微波固相法制备了CaWO_4∶xEu~(3+),ySm~(3+),zLi~+红色荧光粉。测量样品的XRD图、激发谱、发射谱及发光衰减曲线,研究并分析了Eu~(3+)、Sm~(3+)、Li~+的掺杂浓度,对样品微结构、光致发光特性、能量传递及能级寿命的影响。结果表明,Eu~(3+)、Sm~(3+)、Li~+掺杂并未引起合成粉体改变晶相,仍为CaWO_4单一四方晶系结构。Eu~(3+)、Sm~(3+)共掺样品中,Sm~(3+)掺杂为3%时,Sm~(3+)对Eu~(3+)的能量传递最有效。Li~+掺杂起到了助熔剂和敏化剂的作用,使样品发光更强。在394 nm激发下,与CaWO_4∶3%Eu~(3+)样品比较,3%Eu~(3+)、3%Sm~(3+)共掺CaWO_4及3%Eu~(3+)、3%Sm~(3+)、1%Li~+共掺CaWO_4样品的发光分别增强2倍及2.4倍。同一激发波长下,单掺Eu~(3+)样品寿命最短,Sm~(3+)、Eu~(3+)共掺样品随Sm~(3+)浓度增加,寿命先减小后增加,且掺杂了Li~+的样品比不掺Li~+的样品~5D_0能级寿命有所增加。
CaWO_4∶xEu~(3+),ySm~(3+),zLi~+ red phosphors were prepared by the microwave solid state method. The XRD was used to analyze the microstructures of samples. The excitation spectra, emission spectra and luminescence decay curves of the samples were measured. The influences of the concentration of Sm~(3+), Eu~(3+),Li~+ on the microstructure, luminescence properties, energy transfer, fluorescence decay and energy level lifetime for synthesized samples were researched. The results show that the doping of Eu~(3+), Sm~(3+) or Li~+can not cause the change of the crystalline phase of the synthesized powders, which is still single tetragonal structure of CaWO_4. For Eu~(3+)and Sm~(3+)co-doped samples, when the doping concentration of Sm~(3+) was 3%, and the energy transfer from Sm~(3+) to Eu~(3+) was the most effective. The doped Li~+ acted as a flux and sensitizer, which improved the luminescent intensity of the sample. At the excitation wavelength 394 nm, compared with Eu~(3+)single doped CaWO_4, the luminescence of 3%Eu~(3+), 3%Sm~(3+) co-doped CaWO_4 and 3%Eu~(3+), 3%Sm~(3+), 1%Li~+co-doped CaWO_4 increased by 2 times and 2.4 times respectively. At the same excitation wavelength, Eu~(3+)single doped samples had the shortest lifestime. With the increase of Sm~(3+)concentration, the lifetime of Eu~(3+), Sm~(3+)co-doped samples first decreased and then increased. The ~5D_0 energy level lifetime of the sample doped with Li~+ increased compared the sample without Li~+.
CaWO_4∶xEu~(3+),ySm~(3+),zLi~+ red phosphors were prepared by the microwave solid state method. The XRD was used to analyze the microstructures of samples. The excitation spectra, emission spectra and luminescence decay curves of the samples were measured. The influences of the concentration of Sm~(3+), Eu~(3+),Li~+ on the microstructure, luminescence properties, energy transfer, fluorescence decay and energy level lifetime for synthesized samples were researched. The results show that the doping of Eu~(3+), Sm~(3+) or Li~+can not cause the change of the crystalline phase of the synthesized powders, which is still single tetragonal structure of CaWO_4. For Eu~(3+)and Sm~(3+)co-doped samples, when the doping concentration of Sm~(3+) was 3%, and the energy transfer from Sm~(3+) to Eu~(3+) was the most effective. The doped Li~+ acted as a flux and sensitizer, which improved the luminescent intensity of the sample. At the excitation wavelength 394 nm, compared with Eu~(3+)single doped CaWO_4, the luminescence of 3%Eu~(3+), 3%Sm~(3+) co-doped CaWO_4 and 3%Eu~(3+), 3%Sm~(3+), 1%Li~+co-doped CaWO_4 increased by 2 times and 2.4 times respectively. At the same excitation wavelength, Eu~(3+)single doped samples had the shortest lifestime. With the increase of Sm~(3+)concentration, the lifetime of Eu~(3+), Sm~(3+)co-doped samples first decreased and then increased. The ~5D_0 energy level lifetime of the sample doped with Li~+ increased compared the sample without Li~+.
引文
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