高温固相法合成Ce~(3+), Dy~(3+)掺杂的YGa_3(BO_3)_4及其荧光性质

A series of Ce³⁺ singly doped and Ce³⁺, Dy³⁺ co-doped YGa₃(BO₃)₄ phosphors were prepared by the high-temperature solid-phase method. By analyzing the X-ray diffraction data, the unit cell parameters of this series of phosphors change linearly with the increase in the concentration of doped ions, and no impurity diffraction peaks were observed in the diffraction data, thus confirming the successful doping of rare earth ions and that all samples are pure phases. In the YGa₃(BO₃)₄ matrix, after Ce³⁺ is incorporated, there is a strong broadband absorption in the ultraviolet and near-ultraviolet regions, and its fluorescence emission wavelength is also located in the near-ultraviolet region. Therefore, it can be used as a sensitizer to enhance the white light emission of Dy³⁺ in this matrix. Through the spectral study of the Ce³⁺, Dy³⁺ co-doped phosphors, it was confirmed that there is an effective energy transfer from Ce³⁺ to Dy³⁺, and the transfer mechanism is mainly a quadrupole - quadrupole interaction. The transfer efficiency in Y₀.₇₉Ce₀.₁₀Dy₀.₁₁Ga₃(BO₃)₄ reaches 61.58%, and the sensitization of Ce³⁺ greatly enhances the luminescence of Dy³⁺. Under the excitation of 273 nm, the color coordinates of the emission spectrum of Y₀.₈₉Ce₀.₁Dy₀.₀₁Ga₃(BO₃)₄ are (0.3268, 0.3438), and the color temperature is 5749 K, which is close to the standard white light color coordinates.

通过高温固相法制备了Ce3+ 单掺以及Ce3+ ，Dy3+ 共掺杂YGa3( BO3)4系列荧光粉。通过分析X 射线衍射数据，该系列荧光粉的晶胞参数随掺杂离子的浓度增加线性变化，且衍射数据未观察到杂质衍射峰，进而确认稀土离子掺杂成功且样品均为纯相。在YGa3( BO3)4基质中，Ce3+ 掺入后在紫外和近紫外区有很强的宽带吸收，其荧光发射波长也位于近紫外区，因此可作为敏化剂来增强Dy3+ 在该基质中的白光发射。通过对Ce3+ ，Dy3+ 共掺杂荧光粉的光谱研究，确认了Ce3+→Dy3+ 存在有效的能量传递，传递机制以四级－四级相互作用为主。Y0．79Ce0．10Dy0．11Ga3( BO3)4中传递效率达到61．58%，Ce3+ 的敏化使得Dy3+ 的发光大幅增强。在273 nm 激发下，Y0．89Ce0．1Dy0．01Ga3( BO3)4发射光谱的色坐标为( 0．3268，0．3438) ，色温为5749 K，接近标准白光色坐标。