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Color-tunable luminescence of Eu3+ in LaF3 embedded nanocomposite for light emitting diode / Daqin Chen in Acta materialia, Vol. 58 N° 8 (Mai 2010) 

Public ISBD [article]  in Acta materialia > Vol. 58 N° 8 (Mai 2010) . - pp. 3035–3041 Titre : Color-tunable luminescence of Eu3+ in LaF3 embedded nanocomposite for light emitting diode Type de document : texte imprimé Auteurs : Daqin Chen, Auteur ; Yunlong Yu, Auteur ; Ping Huang, Auteur Année de publication : 2011 Article en page(s) : pp. 3035–3041 Note générale : Métallurgie Langues : Anglais (eng) Mots-clés : Crystallization  Nanocomposite  Microstructure  Optical  properties  High-resolution  electron  microscopy Résumé : Eu3+-doped transparent nanocomposite of SiO2–Al2O3–NaF–LaF3 was fabricated by melt-quenching and subsequent heating. X-ray diffraction and transmission electron microscopy analyses evidenced that hexagonal LaF3 nanocrystals were homogeneously precipitated among the aluminosilicate glass matrix. The distribution of Eu3+ ions in the nanocomposite was investigated by energy dispersive X-ray spectroscopy, photoluminescence and time-resolved luminescence spectra. The nanocomposite exhibited intense blue and green emissions originating from the 5D1,2,3 levels of Eu3+ incorporated in the low-phonon-energy LaF3 nanocrystals, and red emission corresponding to the Eu3+:5D0 → 7FJ (J = 0, 1, 2, 3, 4) transitions, under the excitation of single wavelength light at 394 nm. By adjusting the Eu3+ doping content, various luminescent colors, including perfect white light, were easily tuned through cross relaxation processes between Eu3+ ions. The results suggest that the Eu3+-doped transparent nanocomposite could be potentially applicable as a white-light-emitting material under UV chip excitation. DEWEY : 669 ISSN : 1359-6454 En ligne : http://www.sciencedirect.com/science/article/pii/S1359645410000492 [article] Color-tunable luminescence of Eu3+ in LaF3 embedded nanocomposite for light emitting diode [texte imprimé] / Daqin Chen, Auteur ; Yunlong Yu, Auteur ; Ping Huang, Auteur . - 2011 . - pp. 3035–3041. Métallurgie Langues : Anglais (eng) in Acta materialia > Vol. 58 N° 8 (Mai 2010) . - pp. 3035–3041 Mots-clés : Crystallization  Nanocomposite  Microstructure  Optical  properties  High-resolution  electron  microscopy Résumé : Eu3+-doped transparent nanocomposite of SiO2–Al2O3–NaF–LaF3 was fabricated by melt-quenching and subsequent heating. X-ray diffraction and transmission electron microscopy analyses evidenced that hexagonal LaF3 nanocrystals were homogeneously precipitated among the aluminosilicate glass matrix. The distribution of Eu3+ ions in the nanocomposite was investigated by energy dispersive X-ray spectroscopy, photoluminescence and time-resolved luminescence spectra. The nanocomposite exhibited intense blue and green emissions originating from the 5D1,2,3 levels of Eu3+ incorporated in the low-phonon-energy LaF3 nanocrystals, and red emission corresponding to the Eu3+:5D0 → 7FJ (J = 0, 1, 2, 3, 4) transitions, under the excitation of single wavelength light at 394 nm. By adjusting the Eu3+ doping content, various luminescent colors, including perfect white light, were easily tuned through cross relaxation processes between Eu3+ ions. The results suggest that the Eu3+-doped transparent nanocomposite could be potentially applicable as a white-light-emitting material under UV chip excitation. DEWEY : 669 ISSN : 1359-6454 En ligne : http://www.sciencedirect.com/science/article/pii/S1359645410000492