Eu-doped barium aluminum oxynitride with the {beta}-alumina-type structure as new blue-emitting phosphor
- Eindhoven Univ. of Technology (Netherlands). Lab. of Solid State and Materials Chemistry
Attractive new blue-emitting phosphors for use in low-pressure mercury gas discharge lamps are synthesized by Eu-substitution in the barium aluminum oxynitride host lattice with the {beta}-alumina-type structure. The emission spectra of these phosphors for 254 nm excitation show a band at about 450 nm with a shoulder at higher wavelength. The maximum quantum efficiency of these materials is about 85--90% just like commercial BaMgAl{sub 10}O{sub 17}:Eu with the {beta}-alumina type structure. The nonoptimized oxynitride phosphors are more sensitive to oxidation (at 873 K) and to short-term depreciation due to 185 nm irradiation compared to commercial BaMgAl{sub 10}O{sub 17}:Eu. However, the maintenance of the oxynitride phosphors in single component fluorescent lamps is improved. Calculations indicate that by using these phosphors in tricolor fluorescent lamps instead of BaMgAl{sub 10}O{sub 17}:Eu with the {beta}-alumina type structure, the color rendering index will improve while the lumen output remains high.
- OSTI ID:
- 328219
- Journal Information:
- Journal of the Electrochemical Society, Journal Name: Journal of the Electrochemical Society Journal Issue: 2 Vol. 146; ISSN 0013-4651; ISSN JESOAN
- Country of Publication:
- United States
- Language:
- English
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