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在LiNbO3中掺入0.1%(摩尔分数,下同)的CoO与3%,6%的ZnO,采用坩埚下降法技术生长了双掺杂的Co2+∶Zn2+∶LiNbO3晶体。用X射线衍射与差热分析表征了获得的晶体。测定了晶体不同部位在350~2 500 nm波段的吸收光谱。研究表明:Co离子位于LiNbO3晶体的崎变的氧八面体中,呈现+2价,沿着生长方向Co2+在晶体中的浓度逐渐减少。ZnO的掺杂有效地抑制了Co2+离子在晶体中的掺入,使得Co2+在晶体中浓度的分布变得均匀。同时发现:ZnO的掺入使得上部晶体的熔点升高。从化学组分的角度解释了产生熔点变化的原因。观测到了750 nm波长的荧光发射带。
LiNbO3 doped with 0.1% (mole fraction, the same below) CoO and 3%, 6% of ZnO, using the crucible down method technology to grow double doped Co2 +: Zn2 +: LiNbO3 crystals. The obtained crystals were characterized by X-ray diffraction and differential thermal analysis. The absorption spectra of different parts of the crystal at 350-2 500 nm were measured. The results show that the Co ions are located in the arborescent oxygen octahedra of LiNbO3 crystal and show a +2 valence. The concentration of Co2 + in the crystal gradually decreases along the growth direction. The doping of ZnO effectively suppresses the incorporation of Co2 + ions in the crystal, so that the concentration distribution of Co2 + in the crystal becomes uniform. It is also found that the incorporation of ZnO increases the melting point of the upper crystal. From the chemical composition point of view to explain the reasons for changes in melting point. Fluorescence emission bands at 750 nm were observed.