【摘要】 水热法合成了掺杂Er3+和Yb3+的KZnF3材料,研究了Er3+和Yb3+在这种基质材料中的吸收和在980nm红外光激发下的上转换发光,对比了不同Yb3+浓度(0%～4%)下的上转换发光特性。实验发现,在同种材料中,Er3+的红光发光强度要明显强于绿光,而且掺Yb3+后红光和绿光的光强比不掺Yb3+时都有了很明显地增强。当Yb3+浓度为2%时上转换发光光强达到最强,大于2%后发光开始减弱。通过分析输出光强与泵浦光强的双对数曲线,发现Er3+的红光和绿光的发射均属于双光子过程,最后分析了红光和绿光上转换发光的具体过程和转换通道。更多还原

【Abstract】 Host materials KZnF₃ codoped with Er³⁺ and Yb³⁺ ions were synthesized by hydrothermal method. The absorption spectra and upconversion spectra excited by 980 nm were investigated. The upconversion properties are contrasted as a function of different Yb³⁺ concentrations （0～4%）. It is found that red emission intensity is apparently stronger than green emission, and both red and green intensity increase remarkably after codoped with Yb³⁺. When Yb³⁺ concentration is 2%, the upconversion intensity reaches it′s strongest peak and begins to decrease when lager than 2%. In this material, the red and green emission are both duo to two photons process. We also analysis upconversion mechanism and process. It is found ET plays a main role in upconversion mechanism in co-doped materials.更多还原