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为了解Cr3+离子在钙铝锗酸盐Ca3Al2Ge3O12石榴石中的光谱性质,合成了Ca3Al2Ge3O12:Cr3+多晶材料;测量了其X射线衍射图,漫反射光谱,激发、发射光谱等;分析了Cr3+离子在钙铝锗酸盐中的发光特性;计算了其晶场强度(Dq/B),Stokes位移(ΔEs)及黄昆-里斯因子(S)等.在450nm激发下,Ca3Al2Ge3O12: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+离子的4T1、4T2、2T2到4A2能级跃迁.低温时R线变得强而锐.通过计算,Dq/B=2.43,ΔEs=1884cm-1,S=5.21.表明在Ca3Al2Ge3O12中Cr3+离子处于较弱的晶场强度,电子-声子耦合较强,为发展可调谐激光材料提供重要线索.
In order to understand the spectral properties of Cr3 + ions in CaAlAlGe3O12 garnet, the Ca3Al2Ge3O12: Cr3 + polycrystalline material was synthesized. The XRD patterns, diffuse reflectance spectra, excitation and emission spectra of Cr3 + (Dq / B), Stokes shift (ΔEs) and Huang Kun-Reis factor (S) were calculated.The emission spectra of Ca3Al2Ge3O12: Cr3 + at room temperature were mainly Which consists of three widebands and weak R lines attached to them, corresponding to 4T1, 4T2, 2T2 and 4A2 energy transitions of Cr3 + ions respectively.The R line becomes strong and sharp at low temperature.By calculation, Dq / B = 2.43, ΔEs = 1884cm-1, S = 5.21, indicating that Cr3 + ions in Ca3Al2Ge3O12 have weaker crystalline field strength and strong electron-phonon coupling, which provides important clues for the development of tunable laser materials.