Relaxation properties of rare-earth ions in sulfide glasses: Experiment and theory

Title
Relaxation properties of rare-earth ions in sulfide glasses: Experiment and theory
Authors
Truong, V.G.; Ham, B.S.; Jurdyc, A.M.; Jacquier, B.; Leperson, J.; Nazabal, V.; Adam, J.L.
Keywords
MULTIPHONON RELAXATION, CHALCOGENIDE GLASSES, OPTICAL-EXCITATION
Issue Date
2006-11
Publisher
AMERICAN PHYSICAL SOC
Abstract
Both radiative and nonradiative relaxation rates for a series of rare-earth ions doped 20Ge-5Ga-10Sb-65S (GeGaSbS) sulfide (chalcogenide) glasses have been determined. Temperature-dependent lifetimes were carried out for various excited levels of the sample. Radiative decay rates were derived by using the Judd-Ofelt approach. Nonradiative decay rates are evaluated by comparing the inversion of measured lifetimes with the calculated radiative decay rates. We have found that the multiphonon relaxation rates should be a predominant decay mechanism among the excited states if the energy gap to the next lower level is smaller than 2500 cm(-1), and the decay mechanism can be determined using the semiempirical "energy-gap law." For an energy gap larger than 2500 cm(-1), additional nonradiative decay processes become dominant over the multiphonon decay. Additional nonradiative decay processes have been quantitatively identified with the diffusion-limited relaxation calculations.
URI
http://dspace.inha.ac.kr/handle/10505/1799
ISSN
1098-0121
Appears in Collections:
College of Engineering(공과대학) > Electrical Engineering (전기공학) > Local Access Journal, Report (전기공학 논문, 보고서)
Files in This Item:
Relaxation.pdfDownload

Items in DSpace are protected by copyright, with all rights reserved, unless otherwise indicated.

Browse