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Title: Optical studies of dynamical processes in disordered materials

Abstract

Our research continues to focus on the study of the structure and the dynamic behavior of insulating solids which can be activated optically. We have been particularly interested in the physical processes which produce relaxation and energy transfer in the optical excited states. Our studies have been based principally on optical laser spectroscopic techniques which reveal a more detailed view of the materials of interest and which will ultimately lead to the development of more efficient optoelectronic materials. 13 refs.

Authors:
Publication Date:
Research Org.:
Georgia Univ., Athens, GA (USA). Dept. of Physics and Astronomy
Sponsoring Org.:
DOE/ER
OSTI Identifier:
6279199
Report Number(s):
DOE/ER/45291-4
ON: DE91006483
DOE Contract Number:
FG09-87ER45291
Resource Type:
Technical Report
Country of Publication:
United States
Language:
English
Subject:
37 INORGANIC, ORGANIC, PHYSICAL AND ANALYTICAL CHEMISTRY; CERAMICS; PHASE STUDIES; DOPED MATERIALS; SPECTROSCOPY; MULLITE; SCANDIUM OXIDES; CRYSTAL GROWTH; YTTRIUM OXIDES; CHROMIUM IONS; FIBERS; LASERS; PHOTO-INDUCED TRANSIENT SPECTROSCOPY; PROGRESS REPORT; SPECTRA; CHALCOGENIDES; CHARGED PARTICLES; DOCUMENT TYPES; INORGANIC ION EXCHANGERS; ION EXCHANGE MATERIALS; IONS; MATERIALS; MINERALS; OXIDE MINERALS; OXIDES; OXYGEN COMPOUNDS; SCANDIUM COMPOUNDS; TRANSITION ELEMENT COMPOUNDS; YTTRIUM COMPOUNDS; 400201* - Chemical & Physicochemical Properties; 400102 - Chemical & Spectral Procedures

Citation Formats

Yen, W.M.. Optical studies of dynamical processes in disordered materials. United States: N. p., 1990. Web. doi:10.2172/6279199.
Yen, W.M.. Optical studies of dynamical processes in disordered materials. United States. doi:10.2172/6279199.
Yen, W.M.. 1990. "Optical studies of dynamical processes in disordered materials". United States. doi:10.2172/6279199. https://www.osti.gov/servlets/purl/6279199.
@article{osti_6279199,
title = {Optical studies of dynamical processes in disordered materials},
author = {Yen, W.M.},
abstractNote = {Our research continues to focus on the study of the structure and the dynamic behavior of insulating solids which can be activated optically. We have been particularly interested in the physical processes which produce relaxation and energy transfer in the optical excited states. Our studies have been based principally on optical laser spectroscopic techniques which reveal a more detailed view of the materials of interest and which will ultimately lead to the development of more efficient optoelectronic materials. 13 refs.},
doi = {10.2172/6279199},
journal = {},
number = ,
volume = ,
place = {United States},
year = 1990,
month =
}

Technical Report:

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  • This report outlines the progress achieved on the relaxation and energy transport of optical excitations in amorphous materials. In the understanding of relaxation processes in the excited state, the role of disordered modes has been clarified. A comprehensive macroscopic analysis has been carried out in the donor-donor transfer within an inhomogeneously broadened transition in a glass. Progress has been achieved in measuring and understanding the quantum efficiency of transitions in glass. New initiatives have been launched in two areas: a study of dynamical processes in activated transparent ceramics; and a program to exploit FEL-FIR radiation for spectroscopic purposes.
  • In general terms, our research activities under the present Agency sponsorship continue to focus on processes and interactions which affect the dynamical behavior of excitations/excited states of optically activated amorphous or disordered solids. The framework of our understanding of these processes has been established with work performed over the past two decades. The advent of more refined spectroscopies, most of them laser based, has allowed a re-examination of these properties in a much more detailed and basic way. A deeper understanding of the interactions which lead to relaxation, energy diffusion and nonlinearities in the disordered phases is important to themore » development of more efficient and better materials to service all of the technologies which employ optically activated materials. In this document, we will present an abbreviated synopsis of the research we have conducted under the auspices of the present grant. We will then outline directions we wish to maintain and will render descriptions of new opportunities which have ensued from our current efforts and which we wish to exploit under renewed sponsorship. 52 refs., 12 figs.« less
  • Aim is to conduct a comprehensive study of processes which affect the relaxation and energy diffusion of optical energy residing in the impurity activated disordered insulators. During this grant period we have continued to consider various non-radiative processes affecting the line widths of optical transitions and the general quantum efficiency of luminescent glasses. We have also begun our analysis of dynamical processes leading to energy transfer in rare earth-activated glasses. Finally, we have begun some exploratory studies of Cr/sup 3 +/ in ceramics with our aim being once again to study various dynamic interactions which impact on the efficiency ofmore » these materials.« less
  • We have presented a brief narrative of the progress we have attained to date in relaxation and transfer studies, in the identification and determination of the nature of the sites of Cr ions in the disordered phases of ceramics and in the study of the optical properties of fibers, inclusive of attempts to localize a single atom in a glass. We intend to pursue a number of continuing studies in the second period of this grant: (1) attempts to stimulate energy transfer process, (2) continued attempts to isolate a single ion in a fiber, and (3) exploitation of the fibermore » configuration for spectroscopic purposes. We again emphasize that our discussion has been abbreviated and is meant principally to convey a sense of the directions we have been undertaking. 12 refs.« less
  • We summarize the progress we have achieved in several areas central to the mission of this grant. These include advanced in our understanding of the nature of relaxation processes which affect the optical linewidths and in the analysis of optical energy transfer accompanied by spectral diffusion in inorganic glasses. We have also developed and demonstrated two new laser spectroscopic techniques, Saturation Resolved Fluorescence (SRF) and Dilution Narrowed Spectroscopy (DNS), which have contributed to our understanding of transparent activated ceramics and other areas of interest. We continue by discussing additional work we propose to undertake, inclusive of on-going activity and certainmore » interesting new initiatives. The bulk of the proposed work is, naturally, based on the experimental accomplishments of the present effort; while the new initiatives center on the opportunities new techniques, such as SRF and DNS, have opened up and on the availability of new optical materials, often with restricted dimensions. 39 refs., 7 figs.« less