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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。
In this paper, the transition of Tb 3+ ions to 5D 4 → 7 Fj is significantly enhanced after the incorporation of Ce 3+ in La 2 SO 6: Tb 3+, and the quenching of ~ 5D 3 → 7 F 2 is rapidly quenched. Thus changing the energy distribution of the emission spectrum, significantly enhancing the green light emission intensity, greatly reducing the blue light emission intensity, and improving the green light purity. Experiments show that La_2SO_6: Ce ~ (3 +) and Tb ~ (3+) are high efficient green phosphors. Through the analysis, it is considered that the enhancement of the transition of Tb ~ (3+) ~ 5D_4 ~ ~ 7F_j in the system is due to the energy transfer of Ce ~ (3+) → Tb ~ (3+) ions, Radiation resonance energy transfer, and there are many channels of energy transfer process. On this basis, the kinetic equation of sensitized luminescence was established, and the decay formula of the number of particles in the excited state of Ce ~ (3 +) ions and the doping of cerium terbium The energy transfer efficiency expression.