稀土掺杂Lu3Al5O12荧光粉的发光特性及能量传递

采用高温固相法制备了Ce、Sm共掺Lu_3Al_5O_(12)荧光粉。通过X射线衍射分析、荧光光谱分析研究了样品的结构、发光特性,并通过理论计算研究了能量传递效率、能量传递的临界距离以及能量传递方式。X射线衍射分析表明所制备的荧光粉具有单一的石榴石结构;荧光光谱分析表明,在464 nm蓝光激发下,Sm~(3+)的引入可增加Lu_3Al_5O_(12)∶Ce,Sm发射光谱中红光成分,并且随着Sm~(3+)浓度的增加,Ce~(3+)发光强度逐渐减弱。计算出Ce~(3+)、Sm~(3+)之间的能量传递效率高达77.42%,确定了Ce~(3+)、Sm~(3+)之间的能量传递机制为偶极-偶极相互作用。

Luminescence and Energy Transfer of Rare Earth Doped Lu3Al5O12 Phosphor

Lu₃Al₅O₁₂:Ce, Sm fluorescent phosphors were synthesized by high temperature solid-state method. The structures and luminescence properties of samples was analyzed by X-ray diffraction and fluorescence spectrum analysis. Additionally, the energy transfer efficiency, the transfer critical distance and the way of energy transfer were calculated. X-ray diffraction analysis shows that the synthesized phosphors have single garnet structure; the fluorescence spectrum analysis shows that the introduction of Sm³⁺ can increase the red component of the emission spectrum of Lu₃Al₅O₁₂:Ce, Sm fluorescent phosphors under the excitation wavelength of 464 nm blue light and with the increase of Sm³⁺ concentration, the luminescence intensity of Ce³⁺ gradually decreased. Besides, the energy transfer efficiency between Sm³⁺ and Ce³⁺ as high as 77.42% was calculated. The transfer mechanism of Ce³⁺ and Sm³⁺ is determined to be dipole-dipole interaction.