摘要
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Y3+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 Y^3＋ co-doping to the 0.1 and 1.0mol% Er^3＋-doped Al2O3 powders with the molar ratio of （0-10）： 1 for Y^3＋ and Er^3＋ was performed in the non-aqueous sol-gel progress using the aluminium isopropoxide [Al（OC3HT）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 Y^3＋ co-doping on the phase structure and photoluminescence （PL） of the Er^3＋-doped Al2O3 powders were investigated by X-ray diffraction （XRD） and PL measurement. The Y^3＋ addition in the Er^3＋-doped Al2O3 powders suppressed the crystallization of γ-（Er,Al）2O3 and θ-（Er,Al）2O3 phases. The enhancement of the PL properties by Y^3＋ co-doping is related to Er^3＋ concentration in the Er^3＋-doped Al2O3 powders. For the 1mol% Er^3＋-doped Al2O3 powders, co-doping Y^3＋ 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% Er^3＋-doped Al2O3 powders by 10mol% Y^3＋ co-doping is enhanced by 50 times and almost 10 times higher than that of the 0.1mol%Er^3＋-doped Al2O3 powders, and the FWHM is enhanced by a gain of 15nm in comparison with those for the 1mol% Er^3＋-doped powders. However, for the 0.1mol% Er^3＋-doped Al2O3 powders, no significant change in the intensity and FWHM of PL spectra is observed with all the Y^3＋ incorporations. The improvement of intensity and FWHM of PL spectra for the Er^3＋-doped Al2O3 powders by Y^3＋ co-doping is attributed to the improved dispersion and disordered local structure around Er^3＋ in the matrix of the Er^3＋-doped Al2O3 powders, respectively.
出处
《无机材料学报》
SCIE
EI
CAS
CSCD
北大核心
2006年第4期803-808,共6页
Journal of Inorganic Materials
基金
教育部科学研究重点项目(01052)
