Photoluminescence properties and charge compensation investigations of novel orange-emitting Eu^sup 3+^ doped Na^sub 4^Ca^sub 4^(Si^sub 6^O^sub 18^) phosphors
A series of polycrystalline Na4Ca4(Si6O18):Eu3+ orange emitting phosphors were synthesized by a conventional high-temperature solid-state reaction. The phase formation was confirmed by X-ray power diffraction analysis. The excitation spectra show a strong host absorption indicating an efficient ener...
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Veröffentlicht in: | Journal of materials science. Materials in electronics 2016-07, Vol.27 (7), p.6681 |
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Hauptverfasser: | , , , , , , |
Format: | Artikel |
Sprache: | eng |
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Zusammenfassung: | A series of polycrystalline Na4Ca4(Si6O18):Eu3+ orange emitting phosphors were synthesized by a conventional high-temperature solid-state reaction. The phase formation was confirmed by X-ray power diffraction analysis. The excitation spectra show a strong host absorption indicating an efficient energy transfer process from O2- to Eu3+ ions. Upon NUV radiation, the phosphors showed strong red emission around 610 nm (5D0 [arrow right] 7F2) and orange emission around 591 nm (5D0 [arrow right] 7F1), but the 5D1,2,3 emission nearly can not be seen. Compared with the luminescence properties of Li+, Na+, and K+ co-doped samples, we deduced that Na+ ions probably prefer to dope into the intrinsic Na vacancies rather than Ca2+ ions vacancies in Na4Ca4(Si6O18) crystal. Thermal stability properties, quantum efficiency and chromaticity coordinates of the phosphors have been investigated for the potential application in white LEDs. |
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ISSN: | 0957-4522 1573-482X |
DOI: | 10.1007/s10854-016-4615-1 |