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采用提拉法生长了掺0.25%(摩尔分数,下同)Yb2O3,0.25%Er2O3和(0.5%、1.0%、1.5%)In2O3的3种同成分In∶Yb∶Er∶LiNbO3晶体。通过晶体的红外光谱,解释了In3+,Yb3+和Er3+在晶体中的占位,由于Yb3+和Er3+离子的掺入,在In∶Yb∶Er∶LiNbO3晶体中In3+既占据Li位又部分占据Nb位,使2%In∶Yb∶Er∶LiNbO3晶体达到阈值浓度。采用980nm二极管激光器测试了In∶Yb∶Er∶LiNbO3晶体上转换发射光谱。结果表明:晶体的绿光上转换发射中心波段位于525、550nm处,分别相应于Er3+的2 H11/2→4 I15/2跃迁和4 S3/2→4 I15/2跃迁;上转换红光发射中心波段在660nm处,对应Er3+的4 F9/2→4 I15/2辐射跃迁。In3+能提高Yb∶Er∶LiNbO3晶体的抗光损伤能力,改变Er3+和Yb3+的局部环境及Yb3+对Er3+的敏化作用,使得In∶Yb∶Er∶LiNbO3晶体发光性能改变。
Three kinds of In: Yb: Er: LiNbO3 crystals with the same composition of Yb2O3, 0.25% Er2O3 and (0.5%, 1.0%, 1.5%) In2O3 were grown by Czochralski method. The In3 +, Yb3 + and Er3 + in the crystal are accounted for by the infrared spectrum of the crystal. Because of the incorporation of Yb3 + and Er3 + ions, In3 +, Yb3 + and Er3 + occupy both the Li site and the Nb site in the In: Yb: Er: LiNbO3 crystal, 2% In: Yb: Er: LiNbO3 crystals were brought to the threshold concentration. Up-conversion emission spectra of In: Yb: Er: LiNbO3 crystals were measured with a 980 nm diode laser. The results show that the center wavelength range of green upconversion and emission is at 525 and 550 nm, corresponding to 2 H11 / 2 → 4 I15 / 2 transitions and 4 S3 / 2 → 4 I15 / 2 transitions of Er3 +, respectively. Upconversion red emission The central band at 660 nm corresponds to the 4 F9 / 2 → 4 I15 / 2 transition of Er3 +. In3 + can improve the resistance to light damage of Yb: Er: LiNbO3 crystal, change the local environment of Er3 + and Yb3 +, and sensitize Yb3 + to Er3 +, so that the luminescence properties of In: Yb: Er: LiNbO3 crystal change.