（Gd，Y）P_5O_（14）：Ce，Tb中Gd的中介能量传递和传递几率计算

ENERGY TRANSFER PHENOMENA VIA THE Gd￣(3+) SUBLATTICE IN (Gd,Y) P_5O_(14): Ce,Tb

研究了稀土五磷酸盐（ＧｄｘＹ１－ｘ）Ｐ５Ｏ１４：Ｃｅ０．０１，Ｔｂ０．０２体系中以Ｇｄ３＋子晶格为中介的Ｃｅ３＋→Ｇｄ３＋→Ｔｂ３＋的能量传递现象。当ｘ＞０．７，在室温下激发Ｃｅ３＋离子可以产生有效的Ｔｂ３＋的发光。对ｘ＝１和０时，激发Ｃｅ３＋产生Ｔｂ３＋的发光，前者的强度约为后者的１０倍。在ｘ＞０．７时，Ｇｄ３＋的中介能量传递来源于结构从ｘ≤０．７时的单斜Ⅱ（Ｃ２／ｃ）层状结构变为单斜ⅠＰ２１／ｃ带状结构，以及Ｃｅ３＋的发射和Ｇｄ３＋的吸收光谱交迭增加。本文还讨论了能量传递的途径，计算了这一过程中能量传递和辐射的几率。

Energy transfer phenomena from Ce3+ to Tb3+ via the Gd3+ sublattice in rare earth doped pentaphosphate (Gdx Y1-x) P14O5: Ce0.01,Tb0.02 have been investigated. For x >0. 7and at room temperature,excitation into the Ce3+ ion results effective Tb3+ emission. The intensity of Tb3+ emission under excitation into the Ce3+ for x =1 is about 10 times as that for x = 0. When x > 0. 7,the reason for Gd3+ playing an intermediate role in energy transfer are (1) the crystal structure of the system changed from monoclinic Ⅱ (space group C2 /c) layer structure to monoclinic Ⅰ(P21 /c) ribbon structure, (2) the spectral overlap of Ce3+ emission spectrum and Gd3+ absorption spectrum increases by increasing x value. In this paper,the energy transfer processes and radiative processes in (Gd, Y) P14O5: Ce,Tb have been discussed and the energy transfer and radiative probabilities have been calculated.