Ranulfo Allen, John Baglin, et al.
J. Photopolym. Sci. Tech.
We present a thorough investigation of nonradiative energy-transfer processes in various rare-earth (R) pentaphosphates (RP5O14). Using time-resolved fluorescence spectroscopy, different crystals with high and low concentration of the interacting R3+ ions were investigated. It turns out that energy transfer in RP5O14 causes both spatial energy migration of excited states and fluorescence quenching. At high rare-earth concentration the concentration dependence of fluorescence quenching is shown to be governed by fast energy migration. From low-concentration measurements the dominant interionic coupling mechanism could be determined employing a microscopic picture for the energy-transfer process. A particular statistical model is introduced to combine the results obtained in the low- and high-concentration limit. The investigations yield that energy transfer in RP5O14 is due to electric multipole interactions within the entire range of rare-earth concentrations, even at interionic spacings of 5. © 1981 The American Physical Society.
Ranulfo Allen, John Baglin, et al.
J. Photopolym. Sci. Tech.
Zelek S. Herman, Robert F. Kirchner, et al.
Inorganic Chemistry
J.H. Kaufman, Owen R. Melroy, et al.
Synthetic Metals
Arvind Kumar, Jeffrey J. Welser, et al.
MRS Spring 2000