采用密度泛函理论框架下的第一性原理平面波超软赝势方法,建立了未掺杂和La高掺杂锐钛矿型TiO2超胞模型,分别对模型进行了几何结构优化、分波态密度分布、能带分布、Mullkien电荷数、差分电荷密度和吸收光谱计算.结果表明,在本研究限定的浓度范围内,La掺杂浓度越低锐钛矿型TiO2越稳定；La掺杂后锐钛矿型TiO2的离子键进一步增强,且最小禁带宽度变窄,吸收光谱发生红移现象；当La掺杂质量分数分别为10.14％,19.01％时,最小带隙均约为1.84- eV,高能区吸收光谱几乎相同.
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