Improvement of luminescent properties of thin-film phosphors by excimer laser processing
- Univ. of California, San Diego, La Jolla, CA (United States)
- Los Alamos National Lab., NM (United States)
Thin-films of europium doped yttrium oxide, (Y{sub 1{minus}x}Eu{sub x}){sub 2}O{sub 3}, were deposited on sapphire substrates by metallorganic chemical vapor deposition. The films, {approximately} 400 nm thick, were weakly luminescent in the as-deposited condition. A KrF laser was pulsed once on the surface of the films at a fluence level between 0.9--2.3 J/cm{sup 2}. One pulse was sufficient to melt the film, which increased the photoluminescent emission intensity. Melting of a rough surface resulted in smoothing of the surface. The highest energy pulse resulted in a decrease in luminous intensity, presumably due to material removal. Computational modeling of the laser melting and ablation process predicted that a significant fraction of the film is removed by ablation at the highest fluence levels.
- Research Organization:
- Los Alamos National Lab., NM (United States)
- Sponsoring Organization:
- USDOE Assistant Secretary for Human Resources and Administration, Washington, DC (United States)
- DOE Contract Number:
- W-7405-ENG-36
- OSTI ID:
- 296757
- Report Number(s):
- LA-UR--98-1975; CONF-980447--; ON: DE99000698
- Country of Publication:
- United States
- Language:
- English
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