Luminescent properties of A1N activated by europium |
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Authors: | F. Karel J. Mareš |
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Affiliation: | (1) Institute of Physics, Czechosl. Acad. Sci., Prague, Na Slovance 2, Praha 8, Czechoslovakia |
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Abstract: | The concentration and temperature dependence of emission and excitation spectra was measured on powder A1NEu phosphors. It was shown that A1N: Eu has two luminescent modifications which depend on the activator concentration. At low activator concentration the wide emission band is found in the blue-green region, while at high concentration it is in green region. The excitation spectra of A1NEu consist of wide bands extended from 40×103 cm–1 to 22 × × 103 cm–1. The emission and excitation spectra are interpreted as transitions between energy levels of Eu2+ ions (4f74f6 5d transitions). The structure of the Eu2+ luminescent centres and the temperature dependence of luminescence are discussed.The authors thank Dr. M.Polcarová for the RTG measurements and Mrs. I.Míková for the spectral analysis of the A1N: Eu samples. The authors are also grateful to Prof. M.Trlifaj, Dr. J.Pastrák and Dr. J.Kubátová for valuable discussions. |
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