Promising Zn₃Ta₂O₈:Pr³⁺ Red Phosphor for Low Voltage Cathodoluminescence Applications

Abstract:

Zn₃Ta₂O₈ is a promising host for low voltage cathodoluminescence (CL) applications. Surface chemical stability during low voltage electron beam excitation is a prime concern for phosphors to be used in various new generation information displays. Photoluminescence (PL) and CL characteristics of the Zn₃Ta₂O₈ host doped with Pr³⁺ are presented. The phosphors were synthesized via solid-state reaction route at 1100°C. Red CL or PL with a maximum at 611 nm, attributed to the ¹D₂-³H₄ transition of the Pr³⁺ ion, was observed at room temperature under high energy electron (2 keV, 12 μA) or a monochromatic xenon lamp (257 nm) irradiation. Electron stimulated chemical changes on the surface of the Zn₃Ta₂O₈:Pr³⁺ phosphor during an electron beam exposure from 0-350 C/cm² was monitored using Auger electron spectroscopy. The CL exhibited only a 20% loss in the original intensity during the continuous electron beam exposure. X-ray photoelectron spectroscopy (XPS) was used to estimate the redox states of the chemical constituents and a comparison of binding energies was made with the standard Ta₂O₅ and ZnO compounds. A correlation between the structural configuration of Zn₃Ta₂O₈ and the XPS data is also established.

• Periodical: Advanced Materials Research (Volumes 306-307)
• Pages: 251-254
• DOI: https://doi.org/10.4028/www.scientific.net/AMR.306-307.251
• Online since: August 2011
• Authors: Shreyas S. Pitale, L.L. Noto, I.M. Nagpure, O.M. Ntwaeaborwa, J.J. Terblans, Hendrik C. Swart
• Keywords: Cathodoluminescence Stability, ESSCR, Phosphor, X-Ray Photoelectron Spectroscopy (XPS), Zinc Tantalate

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DOI: 10.1002/sia.3282

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