White light emission from rare earth activated yttrium silicate nanocrystalline powders and thin films
作者： J.A. Gonzalez-Ortega , E.M. Tejeda , N. Perea , G.A. Hirata , E.J. Bosze
DOI: 10.1016/J.OPTMAT.2004.10.018
关键词:
摘要: We present a potential rare earth activated white-emitting nanocrystalline phosphor powders produced by combustion synthesis and report their luminescent properties thin films deposited pulsed laser ablation. Effects of varying the atomic concentration dopants in Y 2 SiO 5 :Ce x ,Tb y (0.0065 < 0.0085, 0.010 0.040), along with morphological, microstructural photoluminescence (PL) were investigated order to produce white-light emission close D 65 optimized efficiency. Characteristic electronic transitions measured from spectra at λ em = 544 nm ( 4 → 7 F ) Tb 3+ 418 (5d 7/2 Ce show that an inductive energy transfer occurs when ions absorbs upon excitation long-UV photons (λ exc 358-380 nm). The optimal for best luminescence intensity has been obtained 0.0075 0.025 , closest daylight white was found composition :-Ce 0.040 . These phosphors two yttrium silicate host (Y represent efficient way chromaticity coordinates 0.225 0.320.
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