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首页> 外文期刊>Dalton transactions: An international journal of inorganic chemistry >Luminescence and photometric characterization of K~+ compensated CaMoO_4:Dy~(3+) nanophosphors
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Luminescence and photometric characterization of K~+ compensated CaMoO_4:Dy~(3+) nanophosphors

机译:K〜+补偿的CaMoO_4:Dy〜(3+)纳米磷光体的发光和光度表征

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摘要

A series of CaMoO_4 phosphors doped with trivalent dysprosium (Dy~(3+)) and codoped with potassium (K~+) ions were prepared by hydrothermal method. The nanostructures of the as-synthesized phosphors were investigated by X-ray diffraction (XRD). The results reveal that the obtained powder phosphors are single-phase scheelite structure with tetragonal symmetry and the crystallite size is in the range of 10-60 nm. The emission spectra show a bright yellow emission at 576 nm and blue emission at 487 nm. As a charge compensator, K~+ ions were incorporated into CaMoO_4:Dy ~(3+) phosphors, which enhance the PL intensities depending on the doping concentration of K~+. The CIE parameters such as colour coordinates, colour correlated temperature and luminous efficacy of radiation were calculated using spectral energy distribution functions and McCamy's empirical formula. Photometric characterization indicates the suitability of K~+ compensated CaMoO_4:Dy~(3+) phosphor for white LED applications.
机译:采用水热法制备了一系列掺有三价(Dy〜(3+))和共掺杂钾(K〜+)的CaMoO_4荧光粉。通过X射线衍射(XRD)研究了合成后的磷光体的纳米结构。结果表明,所得到的粉末荧光粉为具有四方对称的单相白钨矿结构,微晶尺寸为10-60nm。发射光谱在576 nm处显示亮黄色发射,在487 nm处显示蓝色发射。作为电荷补偿剂,K〜+离子被掺入CaMoO_4:Dy〜(3+)磷光体中,根据K〜+的掺杂浓度,磷离子强度会提高。使用光谱能量分布函数和McCamy的经验公式来计算CIE参数,例如颜色坐标,颜色相关温度和辐射的发光效率。光度表征表明,K〜+补偿的CaMoO_4:Dy〜(3+)荧光粉适用于白色LED应用。

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