The vibrational and luminescence properties of the TbAl₃(BO₃)₄ single crystal were studied in the temperature range of 5–300 K. Raman spectra of the single crystal revealed 5 of 7 A₁ and all E phonon modes predicted by the group-theory analysis. The splitting energy between the LO and TO components of polar E phonons is determined. A group of intense bands associated with the ⁵D₄ → ⁷F₀ electronic transition was observed in the energy range of 14520–14680 cm⁻¹ of the luminescence spectra. The intensity of these bands decreases upon heating. At the same time, the bands which can be assigned with ⁵D₄ → ⁷F₆, ⁵D₄ → ⁷F₅, and ⁵D₄ → ⁷F₄ transitions were revealed in luminescence spectra at room temperature. The intensity of these bands is comparable to the intensity of the Raman spectrum of TbAl₃(BO₃)₄. The observation of luminescence from the ⁵D₄ multiplet (20600–20750 cm⁻¹) upon excitation at λ_exc = 632.8 nm (15803 cm⁻¹) and λ_exc = 532 nm (18797 cm⁻¹) indicates strong nonlinear properties of the studied crystal. The structure of the main ⁷F₆ multiplet of Tb⁺³ in the TbAl₃(BO₃)₄ single crystal has been studied at 5 K by Raman spectroscopy. The energies of the electronic levels of ⁷F₆ and ⁵D₄ multiplets were determined from the luminescence spectra measured at 300 K.

中文翻译：

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TbAl3（BO3）4单晶的光谱研究：拉曼光谱和发光光谱

在5–300 K的温度范围内研究了TbAl ₃（BO ₃）₄单晶的振动和发光特性。该单晶的拉曼光谱显示了7 A _1中的5和所有E声子模态。理论分析。确定极性E声子的LO和TO分量之间的分配能。在14520–14680 cm ^-1的能量范围内观察到一组与⁵ D ₄  →  ⁷ F ₀电子跃迁相关的强带的发光光谱。这些带的强度在加热时降低。同时，它可以与被分配的频带⁵ d ₄  →  ⁷ ˚F ₆，⁵ d ₄  →  ⁷ ˚F ₅，和⁵ d _4个 →  ⁷ ˚F ₄跃迁在室温下揭示了发光光谱。这些带的强度与TbAl ₃（BO ₃）₄的拉曼光谱的强度相当。从⁵ D ₄观察发光多重峰（20600-20750厘米^-1）时，在λ激发_EXC  = 632.8纳米（15803厘米^-1）和λ _EXC  = 532纳米（18797厘米^-1）指示所研究的晶体的强非线性特性。TbAl ₃（BO ₃）₄单晶中Tb ^+3的7 F ₆主多重峰的结构已通过拉曼光谱在5 K下进行了研究。根据在300 K下测得的发光光谱确定⁷ F ₆和⁵ D ₄多重电子能级的能量。