论文部分内容阅读
采用高温固相法合成了Cd3Al2Ge3O12:Cr3+多晶材料,利用X射线衍射对其结构进行了分析,通过Cr3+的室温吸收光谱、室温和77 K发射光谱分别对其光谱特性和晶场参数进行了分析和计算.结果表明:在450 nm的蓝光激发下,Cd3Al2Ge3O12:Cr3+室温发射光谱主要由三个宽带及附加其上的弱R线构成,分别对应于Cr3+的4T1,2T2,4T2到4A2能级跃迁.低温时宽带发射变弱,而R线变得强而锐.Cr3+在Cd3Al2Ge3O12中晶场强度Dq/B为2.32,Stokes位移ΔES为1919cm-1,黄昆-里斯因子S为5.58.表明在Cd3Al2Ge3O12中Cr3+处于弱的中等晶场强度,电子-声子耦合较强.4T2零声子能级与2E能级的间距ΔE仅为325.5cm-1,对Cr3+可调谐激光的输出非常有利.
The structure of Cd3Al2Ge3O12: Cr3 + polycrystalline material was synthesized by solid-state reaction at high temperature. The structure of Cd3Al2Ge3O12: Cr3 + polycrystalline material was analyzed by X-ray diffraction. The spectral characteristics and crystal field parameters were analyzed by Cr3 + And calculated.The results show that the room temperature emission spectrum of Cd3Al2Ge3O12: Cr3 + is mainly composed of three widebands and the weak R line attached to it at 450 nm, corresponding to the 4T1, 2T2, 4T2 and 4A2 energy transitions of Cr3 + . The broadband emission becomes weaker at low temperature, while the R line becomes stronger and more sharp.The crystal strength of Cr3 + in Cd3Al2Ge3O12 is 2.32, the Stokes shift ΔES is 1919cm-1, and the Huang Kun-Reis factor S is 5.58, indicating that in the Cd3Al2Ge3O12 Cr3 + is weak in the medium-sized crystal field, and the electron-phonon coupling is strong. The spacing ΔE between the 4T2 zero phonon energy level and the 2E level is only 325.5cm-1, which is very favorable for the output of the Cr3 + tunable laser.