Title :
Modifications of Light Emission Spectra and Atomic Structure of Europium Molibdate Bulk Crystals Caused by High Pressure and Heat Treatment
Author :
Shmurak, S.Z. ; Kiselev, A.P. ; Klassen, N.V. ; Sinitsyn, V.V. ; Shmyt´ko, I.M. ; Kin, B. S Red ; Khasanov, S.S.
Author_Institution :
Inst. of Solid State Phys., Russian Acad. of Sci., Moscow
fDate :
6/1/2008 12:00:00 AM
Abstract :
Essential enhancement of light emission ability of europium molybdate - Eu2(MoO4)3 (EMO) crystals has been achieved by combined application of high pressure (9 GPa) and heat treatment (a procedure was repeated from 3 to 25 times for different samples). Multifold increase in light emission of EMO single crystals can be achieved, without deterioration of the optical transparency of the material. Simultaneously the light emission spectra change substantially. Nature of this phenomenon is explained by the modifications of the crystal field caused by structural transformations induced by the treatments. These modifications of the crystal fields bring to increase in probability of light emission optical transitions between 4f sublevels of europium ions.
Keywords :
annealing; europium compounds; fluorescence; heat treatment; high-pressure effects; photoluminescence; solid scintillation detectors; solid-state phase transformations; transparency; Eu2(MoO4)3; annealing; atomic structure; crystal field; deterioration; europium molibdate bulk crystals; heat treatment; high pressure effects; light emission optical transitions; light emission spectra; luminescence; optical transparency; scintillation detectors; structural phase transformations; Biomedical optical imaging; Crystalline materials; Crystals; Heat treatment; Luminescence; Optical materials; Particle beam optics; Powders; Scintillation counters; Stimulated emission; Annealing; europium compounds; luminescence; pressure effects; scintillation detectors;
Journal_Title :
Nuclear Science, IEEE Transactions on
DOI :
10.1109/TNS.2008.924049
