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首页> 外文期刊>CERAMICS INTERNATIONAL >Synthesis and luminescence properties of broad band greenish-yellow emitting LnVO_4:Bi~(3+) and (Ln1, Ln2)VO_4:Bi~(3+) (Ln=La, Gd and Y) as down conversion phosphors
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Synthesis and luminescence properties of broad band greenish-yellow emitting LnVO_4:Bi~(3+) and (Ln1, Ln2)VO_4:Bi~(3+) (Ln=La, Gd and Y) as down conversion phosphors

机译：宽带绿黄色发射LnVO_4：Bi〜（3+）和（Ln1，Ln2）VO_4：Bi〜（3+）（Ln = La，Gd和Y）的合成和发光性质作为下转换荧光粉

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Ln_(0.97)VO_4:Bi_(0.03)~(3+) and (Lnl_(0.5), Ln2_(0.5))_(0.97)VO_4:Bi_(0.03)~(3+) (where Ln=La, Gd and Y) down conversion (DC) phosphors have been synthesized by a novel co-precipitation technique followed by heat-treatment. The influence of lanthanide host composition on crystal structure, luminescence and pertinent optical properties have been investigated by various spectroscopic techniques; XRD, SEM, FT-IR and PL. The produced phosphors have exhibited an intense greenish-yellow emission, upon UV-irradiation. A broad band excitation (280-350 nm) ascribed to ~1S_0→~3P_1 and an intense broad greenish-yellow emission band (400-700 nm) attributed to ~3P_1→~1S_0 transition, owing to Bi~(3+) ions have been observed. PL spectra revealed that the phosphors with Gd - containing host has exhibited a better luminescence among the others. The luminescence intensity sequence in descending order was as follows: GdVO_4→(Gd, Y)VO_4→(La, Gd)VO-4→(La, Y)VO_4→YVO_4→LaVO_4: Bi~(3+). These phosphors can efficiently convert the UV-photons in a broad range from 280-350 nm of feckless UV-rays into the absorbable visible emission for c-Si solar cells, based on the spectral matching phenomena. In view of the better fluorescence and pertinent optical properties, the phosphor with composition Gd_(0.97)VO_4: Bi_(0.03)~(3+) is a suggestible sought UV-absorbing spectral converter, in its thin transparent DC form for c-Si solar cells for better harvesting the solar energy.
机译：Ln_（0.97）VO_4：Bi_（0.03）〜（3+）和（Lnl_（0.5），Ln2_（0.5））_（0.97）VO_4：Bi_（0.03）〜（3+）（其中Ln = La，Gd和Y）下转换（DC）磷光体是通过一种新型的共沉淀技术然后进行热处理而合成的。镧系元素主体组成对晶体结构，发光和相关光学性能的影响已通过各种光谱技术进行了研究。 XRD，SEM，FT-IR和PL。产生的磷光体在紫外线照射下表现出强烈的黄绿色发射。归因于〜1S_0→〜3P_1的宽带激发（280-350 nm）和归因于〜3P_1→〜1S_0跃迁的归因于Bi〜（3+）离子的强烈的黄绿色宽发射带（400-700 nm）已经观察到。 PL光谱显示，具有Gd-主体的磷光体在其他中表现出更好的发光。发光强度从大到小依次为：GdVO_4→（Gd，Y）VO_4→（La，Gd）VO-4→（La，Y）VO_4→YVO_4→LaVO_4：Bi〜（3+）。基于光谱匹配现象，这些磷光体可以有效地将280-350 nm的无雀斑紫外线中的紫外线光子转换为c-Si太阳能电池可吸收的可见光。考虑到更好的荧光和相关的光学性质，具有组成Gd_（0.97）VO_4：Bi_（0.03）〜（3+）的磷光体是一种理想的紫外吸收光谱转换器，其薄的透明DC形式用于c-Si太阳能电池，以更好地收集太阳能。

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