Mn2+离子掺杂的NaTaOGeO4:Tb3+的发光性能

采用高温固相法制备了颜色可调的NaTaOGeO₄∶Tb³⁺，Mn²⁺荧光粉，并研究了其发光特性以及能量传递机理。在244 nm激发下，NaTaOGeO₄∶Tb³⁺的发射光谱的发射峰分别位于380，413，436，492，544 nm，分别属于Tb³⁺的⁵D₃→⁷F_J和⁵D₄→⁷F_J（J=6，5，4）能级跃迁，为蓝光和绿光发射。在280 nm波长激发下，在492 nm和544 nm处有较强的发射峰，分别属于Tb³⁺的⁵D₄→⁷F₆、⁵D₄→⁷F₅能级跃迁，为绿光发射。在248 nm波长激发下，NaTaOGeO₄∶Mn²⁺的发射光谱由位于576 nm处的宽带组成，属于Mn²⁺的⁴T₁→⁶A₁能级跃迁。当在NaTaOGeO₄∶Tb³⁺荧光粉中共掺杂Mn²⁺时，可以同时观察到Mn²⁺和Tb³⁺的发射峰，通过改变浓度掺杂比，可以得到颜色可调控的荧光粉。

Photoluminescence Properties and Color Tunable of NaTaOGeO4: Tb3+ Co-doped with Mn2+ Ion

The photoluminescence properties and energy transfer mechanism of a color tunable phosphor NaTaOGeO₄:Tb³⁺,Mn²⁺ were investigated in this paper. NaTaOGeO₄:Tb³⁺,Mn²⁺ powder was synthesized successfully by solid state reaction method. The phase purity was checked using X-ray powder diffractometry(XRD). The excitation and emission spectra were recorded to elucidate the photoluminescence properties of NaTaOGeO₄:Tb³⁺,Mn²⁺. Furthermore, the fluorescence lifetime measurements were performed. The emission spectrum of NaTaOGeO₄:Tb³⁺ excited by 244 nm shows blue emissions at 380, 413, 436, 492, 544 nm, which are attributed to ⁵D₃→ ⁷F_J and ⁵D₄→⁷F_J(J=6, 5, 4) transition of Tb³⁺, respectively. The emission spectrum of NaTaOGeO₄:Tb³⁺ excited by 277 nm shows green emissions at 492 nm and 544 nm, which are attributed to ⁵D₄→⁷F₆ and ⁵D₄→⁷F₅ transition of Tb³⁺. The emission spectrum of NaTaOGeO₄:Mn²⁺ shows orange-red emissions at 576 nm, owing to ⁴T₁→⁶A₁ transition of Mn²⁺. With varying the ratio of the concentration of Mn²⁺ and Tb³⁺, a color tunable phosphor NaTaOGeO₄:Tb³⁺,Mn²⁺ can be obtained.