稀土掺杂Lu_3Al_5O_(12)荧光粉的发光特性及能量传递

Luminescence and Energy Transfer of Rare Earth Doped Lu_3Al_5O_(12) Phosphor

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。

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.