作　　者： ; ; ; (文根旺）;

机构地区： 湖南师范大学物理与信息科学学院物理系

出　　处： 《湖南师范大学自然科学学报》 1990年第4期307-312,320,共7页

摘　　要： 本文讨论了在La_2SO_6:Tb^(3+)中掺入Ce^(3+)后,可以使Tb^(3+)离子~5D_4→~7F_j跃迁显著增强,~5D_3→~7F_j迅速淬灭,因而改变了发射光谱的能量分布,明显增强了绿光发光强度,大大降低了蓝光发光强度,提高了绿光纯度。实验表明,La_2SO_6:Ce^(3+),Tb^(3+)是一种高效绿光磷光体。通过分析,认为体系中Tb^(3+)离子~5D_4→~7F_j跃迁的增强作用是由于Ce^(3+)→Tb^(3+)离子的能量传递所致,其能量传递机理属于非辐射共振能量转移,并存在着多渠道的能量传递过程。在此基础上,建立了敏化发光的动力学方程,得出了该体系含铽及不含铽时,Ce^(3+)离子处于激发态上的粒子数衰减公式以及铈铽双掺杂的能量传递效率表达式。 This paper reports the study of the influence of Ce^(3+) ion ont he luminescenceCharacteristic of La_2SO_6:Tb^(3+) It i;shown that the percolation of Ce ions in thisphosphorus can enhance the ~5D_4—~7F_J emision transition of Tb^(3+) dramatically andquench the ~5D_3—~7F_J transition effectively,which results in benefit change in theenergy distribution of emission spectra as the relative intensity of green light isincreased many times over than that of the blue one so that the luminescence purityof green light is improved.The experiment suggests that the La_2SO_6:Tb^(3+),Ce^(3+) is high quality phosphorus of green emission.The reason of enhancement in the ~5D_4—~7F_J transition is analyzed and explained as the irradiate resonance transition ofenergy from Ce^(3+) to Tb^(3+) via various transfer channels.The rate equations arederived for sensitized luminescence process and solved to obtain some expression ofpopulation decay of excited Ce^(3+)ions when phosphorus contains Tb^(3+) or not and theenergy immigration efficiency between Ce and Tb ions.

关 键 词： 发光粉 光谱 铽离子 铈离子

领　　域： [理学] [理学]