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Citation: YUAN Jian-hui, CHENG Yu-min, ZHANG Zhen-hua. Spectral Properties and Crystal Field Parameters of the Cr³⁺ Ions in Ca₃Al₂Ge₃O₁₂ Germanate Garnet[J]. Acta Physico-Chimica Sinica, ;2005, 21(09): 1059-1062. doi: 10.3866/PKU.WHXB20050923 shu

Spectral Properties and Crystal Field Parameters of the Cr³⁺ Ions in Ca₃Al₂Ge₃O₁₂ Germanate Garnet

1.
Department of Physics and Electronic Science, Changsha University of Science & Technology, Changsha 410076; Shanghai Institute of Applied Mathematics and Mechanics, Shanghai University, Shanghai 200072

Received Date: 20 January 2005
Available Online: 15 September 2005

In order to investigate the spectral properties of the Cr3+ in Ca₃Al₂Ge₃O₁₂: garnet, the polycrystal material Ca₃Al₂Ge₃O₁₂:Cr³⁺ was synthesized; its X-ray diffraction patterns, diffuse reflection spectra, excitation and emission spectra were measured. The spectral properties of the material were discussed and the crystal field strength (Dq/B), Stokes displacements(ΔEs) along with Huang-Rhys factors(S) were calculated. Under the excitation of 450 nm light, the emission spectrum of Cr3+ in Ca3Al2Ge3O12 garnet at room temperature mainly consists of three broad bands with weak R line. Three broad bands correspond to 4T1-4A2, 4T2-4A2, and 2T2-4A2 transitions of Cr³⁺ ions, respectively. The R line becomes stronger and sharper at low temperature of 30 K. The calculated results showed Dq/B=2.43, ΔEs=1884 cm-1 and S=5.21, indicating that Cr³⁺ ions in Ca₃Al₂Ge₃O₁₂: garnet locate at weaker crystal field strength and the coupling between the electrons and the phonons is strong. The results imply that Ca₃Al₂Ge₃O₁₂:Cr³⁺ would be a promising material for tunable laser.
- Spectroscopy;Cr3+ doped calcium aluminium germanate garnet;Broad-band emission;Crystal field parameter;Tunable laser material
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沈阳化工大学材料科学与工程学院沈阳 110142

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Spectral Properties and Crystal Field Parameters of the Cr3+ Ions in Ca3Al2Ge3O12 Germanate Garnet

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通讯作者: 陈斌, bchen63@163.com

Spectral Properties and Crystal Field Parameters of the Cr³⁺ Ions in Ca₃Al₂Ge₃O₁₂ Germanate Garnet