Nie Zhaogang, Zhang Jiahua, Zhang Xia, Ren Xinguang, Wang Xiao-Jun, Zhang Guobin
Key Laboratory of Excited State Processes, Changchun Institute of Optics, Fine Mechanics and Physics, Chinese Academy of Sciences, Changchun, China.
Opt Lett. 2007 Apr 15;32(8):991-3. doi: 10.1364/ol.32.000991.
Evidence for visible quantum cutting involving the emission of two visible photons for each vacuum-ultraviolet (VUV) photon absorbed is demonstrated in SrAl(12)O(19):Pr,Cr using synchrotron radiation as one of the excitation sources. Upon VUV excitation of the 4f5d states of Pr(3+), quantum cutting could occur by a two-step energy transfer from Pr(3+) to Cr(3+) by cross relaxation and sequential transfer of the remaining excitation energy. A theoretical visible quantum efficiency of 147% is estimated in SrAl(12)O(19):2% Pr,5% Cr, suggesting the possibility of a VUV phosphor with visible quantum efficiency higher than 100% based on Pr(3+)-Cr(3+) pair in oxide materials.
在以同步辐射作为激发源之一的SrAl(12)O(19):Pr,Cr中，证实了存在可见量子切割现象，即每吸收一个真空紫外（VUV）光子会发射出两个可见光子。在VUV激发Pr(3+)的4f5d态时，量子切割可通过两步能量转移发生，先是通过交叉弛豫从Pr(3+)转移到Cr(3+)，然后再顺序转移剩余的激发能。在SrAl(12)O(19):2% Pr,5% Cr中估计理论可见量子效率为147%，这表明基于氧化物材料中Pr(3+)-Cr(3+)对，有可能制备出可见量子效率高于100%的VUV荧光粉。
