Ba9Y2(SiO4)6: Ce3+,Mn2+荧光粉的发光特性及能量传递

利用高温固相法制备了Ba₉Y₂(SiO₄)₆:Ce³⁺,Mn²⁺(BYS:Ce³⁺,Mn²⁺)荧光粉,并通过X射线衍射(XRD)谱、激发和发射光谱及荧光寿命的测试对材料的结构、发光特性和能量传递进行了研究。在327 nm激发下,BYS:Ce³⁺,Mn²⁺发射光谱中包含2个发射峰,分别为位于407 nm的Ce³⁺的蓝紫光发射和位于597 nm的Mn²⁺的红光发射。在该体系中,发现了Ce³⁺向Mn²⁺的有效能量传递,使得Mn²⁺在597 nm处的红光发射显著提高,当x(Mn²⁺)=0.25时,BYS:Ce³⁺,xMn²⁺的能量传递效率可达39%。实验表明,该荧光粉可为紫外基白光LED提供良好的红光光源。

Luminescence Properties and Energy Transfer in Ba9Sc2(SiO4)6:Ce3+,Mn2+

Ba₉Y₂(SiO₄)₆:Ce³⁺,Mn²⁺ phosphors were prepared by solid-state reaction and their structure, luminescence properties and energy transfer have been investigated by means of XRD, photoluminescence excitation and emission spectra, decay lifetimes, respectively. Upon 327 nm excitation, the phosphor Ba₉Y₂(SiO₄)₆:Ce³⁺,Mn²⁺ exhibits two dominating bands centered at 407 and 597 nm, originate from 5d→4f transition of the Ce³⁺ ion and the ⁴T_1g(4G)→⁶A_1g(6S) transition of the Mn²⁺ ion, respectively. We have discovered energy transfers from Ce³⁺ to Mn²⁺. By utilizing the principle of energy transfer, Mn²⁺ can generate a strong red emission band at 597 nm. The dependence of the ET efficiency can reach to 39% at x=0.25 in BYS:Ce³⁺, xMn²⁺. The results indicate that BYS:Ce³⁺, Mn²⁺ could be used for UV-based white leds as the red light source.