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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.