Two steps enhancement of dual mode (UC and DS) behaviour of Ho~(3+)/Yb~(3+) and Tm~(3+)/Yb~(3+) co-doped GdVO_4 phosphors: Improvement in spectral and color purity

Dharendra Kartikey; Roy Abhishek; Dwivedi Abhishek; Rai Awadhesh Kumar; Rai Shyam Bahadur; Kumar Devendra

首页> 外文期刊>Materials Research Bulletin >Two steps enhancement of dual mode (UC and DS) behaviour of Ho~(3+)/Yb~(3+) and Tm~(3+)/Yb~(3+) co-doped GdVO_4 phosphors: Improvement in spectral and color purity

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Two steps enhancement of dual mode (UC and DS) behaviour of Ho~(3+)/Yb~(3+) and Tm~(3+)/Yb~(3+) co-doped GdVO_4 phosphors: Improvement in spectral and color purity

机译：两个步骤增强了Ho〜（3 +）/ Yb〜（3+）和TM〜（3 +）/ YB〜（3+）共掺杂GDVO_4磷光体的双模（UC和DS）行为：谱和谱的改善颜色纯度

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In the present work, the dual mode (Upconversion and Downshifting) emission behavior of Tm3+/Yb3+ and Ho3+/Yb3+ co-doped GdVO4 phosphors synthesized via high temperature solid state reaction technique have been studied. The pure phase formation has been confirmed by X-rays diffraction (XRD) studies. The crystalline nature has been found to improve on calcining the phosphors at 1473 K and also by incorporation of TiO2. The surface particles' shape and size have been studied by SEM technique. The vibrational behaviour of the vanadate host has been investigated by Fourier Transform Infrared (FTIR) measurements. The UV-vis absorption spectra show the formation of charge transfer band (CTB) in UV region due to (VO4)(3) group. The non-linear upconversion (UC) spectra show intense blue and NIR emission in GdVO4: Tm-3(+)/Th3+ phosphor on excitation with 980 nm radiation, whereas intense green and red UC emissions are observed in GdVO4: Ho3+/Yb3+ phosphor. The downshifting (DS) behaviour has been investigated in both the phosphors which show the self activation behaviour of GdVO4 host along with some sharp peaks in blue and green regions due to f-f transitions in Tm3+ and Ho3+ ions. The dual mode (UC and DS) emission has been further improved on heating the samples at higher temperatures and also by incorporation of TiO2. The color of the phosphor samples in the UC emission spectra has been visualized by CIE diagram. The color purity enhances in both the phosphors by increasing the calcination temperature and also by addition of TiO2. The spectral purity has been also calculated for the UC emission spectra and its also shows the same trend. Such phosphors are applicable for the display devices in blue, green and red regions via dual mode processes.

机译：另外，在本工作中，TM3的双模式（上转换和降档）发射行为+ /镱3+和Ho 3+ /镱经由高温固相反应技术合成共掺杂的磷光体GdVO4晶体已经研究。纯相的形成已经由X射线衍射（XRD）研究证实。结晶性质，已经发现，以改善煅烧以1473K并且还通过二氧化钛掺入的荧光体。表面粒子的形状和尺寸进行了研究，通过SEM技术。该钒主机的振动特性已被傅立叶变换红外光谱（FTIR）测量。紫外 - 可见吸收光谱表明的电荷传输带（CTB）在UV区域的形成是由于（VO4）（3）基团。的Tm-3（+）/ Th3的+与980纳米的辐射激发的荧光体，而强烈的绿色和红色UC排放GdVO4的观察：：非线性（UC）光谱显示强烈的蓝色和NIR在GdVO4的发射上转换稀土Ho3 + /镱荧光体。降档（DS）的行为已经在这两个显示GdVO4的主机的自我激活行为与在蓝色和绿色区域由于Tm 3+和Ho +离子的F-F的过渡一些尖锐的峰沿荧光体进行了研究。双模式（UC和DS）排放已对在较高温度下，并且还通过二氧化钛的掺入将样品加热得到进一步提高。在UC发射光谱荧光体样品的颜色已被CIE图可视化。在这两种荧光体的色纯度提高通过提高焙烧温度，并且还通过添加二氧化钛。光谱纯度也已计算了UC发射光谱和其也示出了相同的趋势。这种荧光体适用于通过双模式进程中的蓝色，绿色和红色区域中的显示装置。

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来源
《Materials Research Bulletin》 |2021年第7期|111280.1-111280.11|共11页
作者
Dharendra Kartikey; Roy Abhishek; Dwivedi Abhishek; Rai Awadhesh Kumar; Rai Shyam Bahadur; Kumar Devendra;
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作者单位

Natl Inst Technol Rourkela Dept Ceram Engn Rourkela Odisha India;

Banaras Hindu Univ Dept Phys Varanasi Uttar Pradesh India;

Univ Allahabad Dept Phys Prayagraj India;

Univ Allahabad Dept Phys Prayagraj India;

Banaras Hindu Univ Dept Phys Varanasi Uttar Pradesh India;

IIT BHU Dept Ceram Engn Varanasi Uttar Pradesh India;

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收录信息美国《科学引文索引》(SCI);美国《工程索引》(EI);美国《生物学医学文摘》(MEDLINE);
原文格式 PDF
正文语种 eng
中图分类
关键词
Rare earth; Phosphors; Dual mode; Photoluminescence; Vanadate;

机译：稀土;磷光体;双模式;光致发光;钒酸盐;
入库时间 2022-08-19 01:57:41

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Two steps enhancement of dual mode (UC and DS) behaviour of Ho~(3+)/Yb~(3+) and Tm~(3+)/Yb~(3+) co-doped GdVO_4 phosphors: Improvement in spectral and color purity

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