Investigations of silicon nano-crystal floating gate memories
Arvind Kumar, Jeffrey J. Welser, et al.
MRS Spring 2000
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.
Arvind Kumar, Jeffrey J. Welser, et al.
MRS Spring 2000
M.A. Lutz, R.M. Feenstra, et al.
Surface Science
Corneliu Constantinescu
SPIE Optical Engineering + Applications 2009
Sang-Min Park, Mark P. Stoykovich, et al.
Advanced Materials