Single crystal growth and cold white light application of Dy,Tb:CaWO4 crystals

IF 2.6 3区化学 Q2 CHEMISTRY, MULTIDISCIPLINARY

CrystEngComm Pub Date : 2025-03-14 DOI:10.1039/D5CE00186B

Xuan Zhang, Jingyi Liu, Jiapan Zheng, Hao Wu, Ruiqing Gong, Jiaru Wang, Zixuan Song, Honghao Xu, Yuxia Zhang and Junhai Liu

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Abstract

We report the Dy:CaWO₄ and Dy,Tb:CaWO₄ crystals grown by the Czochralski method, and their structural and optical properties are studied. Raman spectra, polarization absorption spectra, polarization emission spectra, and fluorescence lifetime are obtained. The Judd–Ofelt intensity parameters (Ω_t, t = 2, 4, 6), the fluorescence branching ratios, and the radiative lifetimes of the ⁴F_9/2 level are calculated based on the Judd–Ofelt theory. The emission cross-sections are calculated using the Füchtbauer–Ladenburg method, showing large emission cross-sections at 573 nm: 9.86 × 10⁻²¹ cm² (π polarization) and 8.11 × 10⁻²¹ cm² (σ polarization) for Dy:CaWO₄, and 9.09 × 10⁻²¹ cm² (π polarization) and 7.69 × 10⁻²¹ cm² (σ polarization) for Dy,Tb:CaWO₄, respectively. In addition, under 450 nm excitation, the crystals emit ideal white light, with CIE coordinates (0.3258, 0.3191) and a correlated color temperature of 6000 K. Therefore, Dy:CaWO₄ and Dy,Tb:CaWO₄ crystals are promising materials for white light-emitting diode (LED) applications.

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Dy，Tb:CaWO4晶体的单晶生长及冷白光应用

本文报道了用Czochralski法生长Dy:CaWO4和Dy，Tb:CaWO4晶体，并对其结构和光学性质进行了研究。得到了拉曼光谱、偏振吸收光谱、偏振发射光谱和荧光寿命。根据Judd-Ofelt理论计算了Judd-Ofelt强度参数（Ωt, t = 2,4,6）、荧光分支比和4F9/2能级的辐射寿命。采用f chtbauer - ladenburg法计算了发射截面，结果表明，Dy:CaWO4在573 nm处的发射截面较大，分别为9.86 × 10−21 cm2 （π极化）和8.11 × 10−21 cm2 （σ极化），Dy、Tb:CaWO4的发射截面分别为9.09 × 10−21 cm2 （π极化）和7.69 × 10−21 cm2 （σ极化）。此外，在450 nm激发下，晶体发出理想的白光，CIE坐标为0.3258,0.3191，相关色温为6000 K。因此，Dy:CaWO4和Dy，Tb:CaWO4晶体是白光发光二极管（LED）应用的有前途的材料。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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