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Title: Mechanisms affecting emission in rare-earth-activated phosphors

Abstract

The relatively poor efficiency of phosphor materials in cathodoluminescence with low accelerating voltages is a major concern in the design of field emission flat panel displays operated below 5 kV. The authors research on rare-earth-activated phosphors indicates that mechanisms involving interactions of excited activators have a significant impact on phosphor efficiency. Persistence measurements in photoluminescence (PL) and cathodoluminescence (CL) show significant deviations from the sequential relaxation model. This model assumes that higher excited manifolds in an activator de-excite primarily by phonon-mediated sequential relaxation to lower energy manifolds in the same activator ion. In addition to sequential relaxation, there appears to be strong coupling between activators, which results in energy transfer interactions. Some of these interactions negatively impact phosphor efficiency by nonradiatively de-exciting activators. Increasing activator concentration enhances these interactions. The net effect is a significant degradation in phosphor efficiency at useful activator concentrations, which is exaggerated when low-energy electron beams are used to excite the emission.

Authors:
; ;
Publication Date:
Research Org.:
Sandia National Labs., Albuquerque, NM (US); Sandia National Labs., Livermore, CA (US)
Sponsoring Org.:
US Department of Energy (US)
OSTI Identifier:
756126
Report Number(s):
SAND2000-1304C
TRN: AH200021%%417
DOE Contract Number:  
AC04-94AL85000
Resource Type:
Conference
Resource Relation:
Conference: Spring, 2000 Materials Research Society Meeting, San Francisco, CA (US), 04/24/2000--04/28/2000; Other Information: PBD: 23 May 2000
Country of Publication:
United States
Language:
English
Subject:
42 ENGINEERING; FIELD EMISSION; DISPLAY DEVICES; PHOSPHORS; CATHODOLUMINESCENCE; PHOTOLUMINESCENCE; MATHEMATICAL MODELS; DOPED MATERIALS; EXCITATION; RARE EARTH COMPOUNDS

Citation Formats

TALLANT,DAVID R., SEAGER,CARLETON H., and SIMPSON,REGINA L. Mechanisms affecting emission in rare-earth-activated phosphors. United States: N. p., 2000. Web.
TALLANT,DAVID R., SEAGER,CARLETON H., & SIMPSON,REGINA L. Mechanisms affecting emission in rare-earth-activated phosphors. United States.
TALLANT,DAVID R., SEAGER,CARLETON H., and SIMPSON,REGINA L. Tue . "Mechanisms affecting emission in rare-earth-activated phosphors". United States. https://www.osti.gov/servlets/purl/756126.
@article{osti_756126,
title = {Mechanisms affecting emission in rare-earth-activated phosphors},
author = {TALLANT,DAVID R. and SEAGER,CARLETON H. and SIMPSON,REGINA L.},
abstractNote = {The relatively poor efficiency of phosphor materials in cathodoluminescence with low accelerating voltages is a major concern in the design of field emission flat panel displays operated below 5 kV. The authors research on rare-earth-activated phosphors indicates that mechanisms involving interactions of excited activators have a significant impact on phosphor efficiency. Persistence measurements in photoluminescence (PL) and cathodoluminescence (CL) show significant deviations from the sequential relaxation model. This model assumes that higher excited manifolds in an activator de-excite primarily by phonon-mediated sequential relaxation to lower energy manifolds in the same activator ion. In addition to sequential relaxation, there appears to be strong coupling between activators, which results in energy transfer interactions. Some of these interactions negatively impact phosphor efficiency by nonradiatively de-exciting activators. Increasing activator concentration enhances these interactions. The net effect is a significant degradation in phosphor efficiency at useful activator concentrations, which is exaggerated when low-energy electron beams are used to excite the emission.},
doi = {},
journal = {},
number = ,
volume = ,
place = {United States},
year = {2000},
month = {5}
}

Conference:
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