Significant reduction of cathodoluminescent degradation in sulfide-based phosphors

J. M. Fitz-Gerald, T. A. Trottier, R. K. Singh, P. H. Holloway

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Abstract

The degradation of cathodoluminescent (CL) brightness under prolonged electron-beam excitation of phosphors has been identified as one of the outstanding critical issues for flat-panel field-emission displays. In this letter, we have demonstrated that a TaSi2 coating on Y2O2S:Eu3+ phosphors substantially inhibits the cathodoluminescent degradation characteristics without reducing its efficiency. The coating was deposited by pulsed laser deposition of TaSi2 targets onto a fluidized bed containing phosphor particles. Cathodoluminescent degradation experiments conducted at 2 keV and at 150μA/cm2, showed that the CL brightness decreased by more than 50% after a Coulomb load of 15C/cm2 on the uncoated material. In contrast, the TaSi2-coated phosphor powders showed much less degradation, with CL brightness only decreasing by approximately 12% after electron irradiation with the same dose.

Original languageEnglish
Pages (from-to)1838-1839
Number of pages2
JournalApplied Physics Letters
Volume72
Issue number15
DOIs
StatePublished - 1998
Externally publishedYes

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