A spectral investigation of Y2O3Al2O3 materials prepared by a sol-gel process

Edney, Cynthia; Condrate, R. A.; Crandall, W.B.; Washburn, M.E.

doi:10.1016/0167-577x(86)90040-6

Cited by 3 publications

(1 citation statement)

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“…In the presnce of flux or inhibitors, particle size distribution (PSD) rnd morphology of the phosphors can be controlled. 12 The iydrothermal method and combustion synthesis are some * Electrochemical Society Active Member.…”

Section: Introductionmentioning

confidence: 99%

Preparation and Characterization of Fine‐Grain Yttrium‐Based Phosphors by Sol‐Gel Process

Rao

1996

J. Electrochem. Soc.

284

135

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The preparation, characterization, and luminescence of yttrium-based phosphors such as europium activated yttrium oxide (red) and terbium activated yttrium aluminate (green) by sol-gel processes is presented. The sols of yttrium hydroxide were synthesized by various routes. It was found that the sols obtained through an ion exchange column were pure and without any cross contamination. The aluminum hydroxide sols were prepared from aluminum chloride and ammonium hydroxide. A number of gel samples were synthesized by mixing stoichiometric amounts of Y(OH)3 and Al(OH)3 to obtain Y3A15012, Y4A1209, and YAIO3 with trace amounts of rare earth, RE(OH)3 gels as activators. These gels were dried at 30 to 80°C. From the thermal analyses, all possible temperature transitions were identified. After calcination with different temperatures and durations, these phosphor powder samples were characterized for crystallization, spectral energy distribution, and morphology. The samples synthesized at lower temperatures (< 1000°C) were fully crystallized. The average particle size of these phosphors was in the range of 1 to 2 p.m. From the luminescence spectral data, all possible transitions 5D0 -7F12 corresponding to Eu3 in Y203, and 5D4 -* 7F1 6 corresponding to (Th3 ) in yttriumaluminum-garnet (YAG) matrices were identified. The luminescent efficiencies of these phosphors were comparable with commercially available phosphors having larger particles (6 to 10 p.m). The preparation of other yttrium-based phosphors such as YAG:RE3 and Y2SiO5:RE3 (RE = Tm, Ce, Th, and Eu) and the luminescence studies of these materials at low voltages for field emission display applications are in progress.

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Section: Introductionmentioning

confidence: 99%