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Photoluminescent and low voltage cathodoluminescent properties of LaNbO4 : X (X = Bi, Eu)phosphors

  • Journal of the Korean Crystal Growth and Crystal Technology
  • Abbr : J. Korean Cryst. Growth Cryst. Technol.
  • 2006, 16(1), pp.32~37
  • Publisher : The Korea Association Of Crystal Growth, Inc.
  • Research Area : Engineering > Materials Science and Engineering

Kim Youhyuk 1,  온지원 1

1단국대학교

Accredited

ABSTRACT

Rare-earth niobates, LnNbO4 (Ln = Y, La, Gd) are well-known self-activated phosphors due to charge transfer inNbO43 showing a broad and strong emission band in the spectral region around 410 nm. In order to find new blue and redphosphors for FED, LaNbO4 : X (X = Bi, Eu) phosphors are prepared through solid-state reactions at high temperature.at 1250oC for 2 h followed by second firing at 1400oC for 1 h. Under irradiation at 254 nm, 1 mol% Bi3+ doped LaNbO4phosphor shows strong blue emission band with a range of 420~450 nm. Also 10 mol% Eu3+ doped LaNbO4 phosphorshows the maximum emission intensity at about 610 nm. Emission peaks at 415~460 nm, 530~560 nm and 570~620 nm areobserved in phosphors below 10 mol% Eu3+ doped LaNbO4. Similar results are obtained in cathodoluminescent property ofthese phosphors.Key words Low voltage cathodoluminescent, Photoluminescent, Lanthanide niobates, FED, Solid state reaction, Phosphor,Excitation spectrum, Emission spectrumLaNbO4 : X (X = Bi, Eu) .... .. . . .. ... .. ....... ...†..... .... ... , ...... ... , .. , 330-714(2005. 10. 5. .. )(2005. 12. 27. .... ). . .... niobates. LnNbO4(Ln = Y, La, Gd). .. ..... NbO43 ... .. ... .. .. .. .. .. ..... 410 nm.. .... . . ..... ... FED. .. . .. .... .... ... LaNbO4 :X (X = Bi, Eu) .... ...... , 1250oC.. 2.. ... . 1400oC.. 1.. ..... . .. ....... . ... . 254 nm. ..... LaNbO4 : Bi. 420~450 nm .... .. .. .. ..... .... ...Bi3+ .. ... 1mol%. . .. ..... ... . LaNbO4 : Eu. ... ... Eu3+ .. ... 10 mol% . . .610 nm.. .. .. .. ..... .... .. . Eu3+ .. ... 10 mol% ..... 415~460 nm, 530~560 nm .570~620 nm .... ... .... .. . .. .... ... ..... . .. ... ... ... ... .1. . .

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