Mechanisms affecting emission in rare-earth-activated phosphors

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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 ... continued below

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10 p.

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Tallant, David R.; Seager, Carleton H. & Simpson, Regina L. May 23, 2000.

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  • Sandia National Laboratories
    Publisher Info: Sandia National Labs., Albuquerque, NM, and Livermore, CA (United States)
    Place of Publication: Albuquerque, New Mexico

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Description

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.

Physical Description

10 p.

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OSTI as DE00756126

Medium: P; Size: 10 pages

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  • Spring, 2000 Materials Research Society Meeting, San Francisco, CA (US), 04/24/2000--04/28/2000

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  • Report No.: SAND2000-1304C
  • Grant Number: AC04-94AL85000
  • Office of Scientific & Technical Information Report Number: 756126
  • Archival Resource Key: ark:/67531/metadc712207

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  • May 23, 2000

Added to The UNT Digital Library

  • Sept. 12, 2015, 6:31 a.m.

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  • April 6, 2017, 6:59 p.m.

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Tallant, David R.; Seager, Carleton H. & Simpson, Regina L. Mechanisms affecting emission in rare-earth-activated phosphors, article, May 23, 2000; Albuquerque, New Mexico. (digital.library.unt.edu/ark:/67531/metadc712207/: accessed October 21, 2018), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.