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¡°The ratio of ED to MD transitions is less than 1 indicates that the trivalent rare earth ions occupy the symmetry site nature of the host lattice. On the contrary, the trivalent rare earth ions occupy the asymmetry site nature of the host lattice. Obviously, the ED transition (609 nm) is stronger than the MD transition (591 nm). The ED/MD values for curve a, b, c and d are 1.47, 1.62, 1.57, and 1.36, respectively. Therefore, Eu3+ ions occupy asymmetry site in Y2P4O13 lattice.¡±

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liujun2008(liouzhan654´ú·¢): ½ð±Ò+1, ¸Ðл½»Á÷ 2017-12-01 13:49:52
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liujun2008: ½ð±Ò+20, ¡ïÓаïÖú, лл 2017-12-01 17:19:48
It is wellknown that the trivalent rare earth ions occupy the symmetry sites in the host lattice as the transition intensity ratio of ED to that of MD is no more than 1; otherwise, they hold the asymmetry ones. It is Obviously from the experimental results that the ED transition intensity at 609 nm is stronger than that of the MD's at 591 nm. Therefore, the ED/MD values for curve a, b, c and d are 1.47, 1.62, 1.57, and 1.36, respectively, that is to say, the Eu3+ ions take up the asymmetry sites in Y2P4O13 lattice.
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