采用高温固相法合成了不同Yb3+和Er3+掺杂浓度的BaIn6Y2O13上转换发光材料。 XRD数据显示, 所合成的BaIn6Y2O13∶Yb3+, Er3+属于六方晶系, 引入激活剂并没有改变基质的晶体结构。 利用971 nm半导体激光器激发样品, 测量样品在不同激发光密度下上转换发射光谱和发射光功率, 计算了上转换能量效率。 数据表明在激发密度不变, 激活剂浓度增加时, 上转换光绿红比减小; 激活剂浓度不变激发光密度增加时, 发射光绿红比增大。 分析表明是由于Er3+之间的交叉弛豫增强导致绿红比随激活剂掺杂浓度的增加而减小; Yb3+和Er3+之间的能量传递和Er3+的激发态吸收增强导致绿红比随激发密度的增加而增大。 随着激发功率增加, 在较低激发功率时, 上转换绿光发射强度与激发功率的二次方成正比; 在较高激发功率时, 上转换绿光发射强度与激发功率的一次方成正比, 与报道的结果一致。 能量效率存在极大值, 分别为0.38%(Yb3+掺杂浓度3%, Er3+掺杂浓度1%)和0.06%(Yb3+掺杂浓度9%, Er3+掺杂浓度3%), 产生极值的一个原因是4I13/2亚稳态能级寿命较长, 聚集了大量电子, 使基态电子急剧减少, 导致上转换泵浦效率降低。

BaIn6Y2O13 phosphors with different doping concentrations of Yb3+ and Er3+ were prepared via the high temperature solid-state reaction method. XRD data showed that BaIn6Y2O13 phosphors belong to hexagonal system and the introduction of doping agent Yb3+ and Er3+ did not change the lattice structure of the host. The upconversion emission spectrum and power were measured by 971 nm LD laser with different excitation powers and the energy efficiencies of the samples were calculated. The obtained data showed that the ratio of green power to red power kept decreasing with the increase in doping agent concentration when the excitation density remains constant, increasing with the increase in the excitation density at the same concentration of doping agent. The analyses revealed that the former was attributed to the increasing cross relaxation between Er3+ ions, while the latter came from the raise of the energy transfer between Yb3+ and Er3+ ions and the excited state absorption of Er3+ ions due to the higher excitation density. With the increase in the excitation density, at the beginning the green luminescence power was proportional to the square of the excitation power, which agrees with the reported result. The maximum values of the fluorescence efficiencies of the samples were obtained as 0.38% (the doping concentrations of Yb3+ and Er3+ are 3%, 1%)and 0.06%(the doping concentrations of Yb3+ and Er3+ are 9%, 3%). It can be attributed to the long lifetime of 4I13/2 energy level so it can gather a large number of electrons and reduce the population of ground state, resulting in lower pump efficiency.