采用非水性溶胶-凝胶法制备了Y3+共掺杂的掺Er3+: Al2O3粉末, Er3+浓度为0.1和1.0mol%, Er3+和Er3+浓度比为1:0～10. X射线衍射和光致发光(PL)光谱结果表明: 900℃烧结的掺0.1和1.0mol%Er3+: Al2O3粉末为具有非晶化特征的γ和θ混合相结构, 非晶化趋势随Y3+共掺杂浓度增大而增加. 掺0.1mol%Er3+:Al2O3粉末, PL光谱强度和半高宽随掺Y3+浓度增大无明显变化. 掺1.0mol%Er3+: Al2O3粉末, PL光谱强度和半高宽随掺Y3+浓度增大而增加, 10mol%Y3+共掺杂粉末的发光强度提高50倍, 约为掺0.1mol%Er3+:Al2O3粉末的10倍, 半高宽从77nm增至92nm. Y3+共掺杂对较高浓度掺Er3+: Al2O3粉末PL性能的增强作用归因于Y3+对Er3+在基体中的分散和配位结构多样性的提高.
The Y3+ co-doping to the 0.1 and 1.0mol% Er3+-doped Al2O3 powders with
the molar ratio of (0～10): 1 for Y3+ and Er3+ was performed in the non-aqueous sol-gel progress using the aluminium isopropoxide Al(OC3H7)3-derived Al2O3 sols with the addition of hydrated erbium nitrate Er(NO3)3·5H2O together with yttrium nitrate Y(NO3)3·5H2O. The effects of Y3+ co-doping on the phase structure and photoluminescence (PL) of the Er3+-doped Al2O3 powders were investigated by X-ray diffraction (XRD) and PL measurement. The Y3+ addition in the Er3+-doped Al2O3 powders suppressed the crystallization of γ-(Er,Al)2O3 and θ-(Er,Al)2O3 phases. The enhancement of the PL properties by Y3+ co-doping is related to Er3+ concentration in the Er3+-doped Al2O3 powders. For the 1mol% Er3+-doped Al2O3 powders, co-doping Y3+ with the concentration up to 10mol% is incorporated in the mixture of γ and θ phases, resulting in an increase of both the intensity and full width at half maximum (FWHM) of PL spectra. The PL intensity for the 1mol% Er3+-doped Al2O3 powders by 10mol% Y3+ co-doping is enhanced by 50 times and almost 10 times higher than that of the 0.1mol%Er3+-doped Al2O3 powders, and the FWHM is enhanced by a gain of 15nm in comparison with those for the 1mol% Er3+-doped powders. However, for the 0.1mol% Er3+-doped Al2O3 powders, no significant change in the intensity and FWHM of PL spectra is observed with all the Y3+ incorporations. The improvement of intensity and FWHM of PL spectra for the Er3+-doped Al2O3 powders by Y3+ co-doping is attributed to the improved dispersion and disordered local structure around Er3+ in the matrix of the Er3+-doped Al2O3 powders, respectively.
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