Improvement of luminescent properties of thin-film phosphors by excimer laser processing

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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 ... continued below

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12 p.

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McKittrick, J.; Bacalski, C.F.; Hirata, G.A.; Sze, R.C.; Mourant, J.; Salazar, K.V. et al. December 31, 1998.

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Description

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.

Physical Description

12 p.

Notes

OSTI as DE99000698

Source

  • SPIE`s international symposium on high-power laser ablation, Santa Fe, NM (United States), 26-30 Apr 1998

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  • Other: DE99000698
  • Report No.: LA-UR--98-1975
  • Report No.: CONF-980447--
  • Grant Number: W-7405-ENG-36
  • DOI: 10.2172/296757 | External Link
  • Office of Scientific & Technical Information Report Number: 296757
  • Archival Resource Key: ark:/67531/metadc675374

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  • December 31, 1998

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  • July 25, 2015, 2:20 a.m.

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  • May 20, 2016, 1:25 p.m.

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McKittrick, J.; Bacalski, C.F.; Hirata, G.A.; Sze, R.C.; Mourant, J.; Salazar, K.V. et al. Improvement of luminescent properties of thin-film phosphors by excimer laser processing, report, December 31, 1998; New Mexico. (digital.library.unt.edu/ark:/67531/metadc675374/: accessed November 22, 2017), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.