Jaroszewski Konrad, Zhezhera Taras, Gluchowski Pawel, Marciniak Lukasz, Chrunik Maciej, Majchrowski Andrzej, Kasprowicz Dobroslawa
Faculty of Technical Physics, Poznan University of Technology, Piotrowo 3, 60-965 Poznań, Poland.
Dalton Trans. 2019 May 7;48(18):6283-6290. doi: 10.1039/c9dt00253g.
The efficiency of the 1.5 μm emission associated with the 4I13/2 → 4I15/2 transition of Er3+ ions of a series of Er3+ and Yb3+/Er3+-doped Bi2ZnOB2O6 microcrystalline powders was investigated. Bi2ZnOB2O6 is an excellent nonlinear optical material as well as a good host matrix for luminescent rare-earth ions. The investigated powders were synthesized by means of the modified Pechini method and their orthorhombic structure with Pba2 space group were confirmed by XRD measurements. The vibrational properties of Bi2ZnOB2O6:Yb3+/Er3+ were studied using μ-Raman spectroscopy. The low phonon energy of the Bi2ZnOB2O6 matrix allows effective phonon assisted energy transfer between rare-earth ions and/or multiphonon relaxation processes of rare-earth ions. It was revealed that the intensity of the 1.5 μm emission under 980 nm excitation increased with increasing Er3+ concentration (from 0.5 to 3.0 at%) for Bi2ZnOB2O6:Er3+, while for co-doped Bi2ZnOB2O6:Yb3+/Er3+ systems a significant increase in this emission was observed for the optimal Yb3+/Er3+ concentration (1.5/0.5 at%). Moreover, the intensity of the 1.5 μm emission decreases with increasing temperature for all investigated samples. Additionally, Bi2ZnOB2O6:Yb3+/Er3+ powders exhibit effective up-conversion luminescence in the visible range under 980 nm excitation. In the up-conversion spectra of Bi2ZnOB2O6:Yb3+/Er3+ powders, the bands corresponding to green and red emission of Er3+ ions (2H11/2 → 4I15/2/4S3/2 → 4I15/2 and 4F9/2 → 4I15/2 transitions, respectively), as well as the bands at about 487 nm (blue emission) associated with second harmonic generation produced by the Bi2ZnOB2O6 matrix were detected. The results indicate a potential for application of Bi2ZnOB2O6:Yb3+/Er3+ powders as effective multifunctional new-generation photonic materials.
研究了一系列掺铒（Er3+）和共掺镱/铒（Yb3+/Er3+）的Bi2ZnOB2O6微晶粉末中，与Er3+离子4I13/2→4I15/2跃迁相关的1.5μm发射效率。Bi2ZnOB2O6是一种优异的非线性光学材料，也是发光稀土离子的良好基质。通过改进的Pechini方法合成了所研究的粉末，并通过XRD测量确认了它们具有Pba2空间群的正交结构。利用μ-拉曼光谱研究了Bi2ZnOB2O6:Yb3+/Er3+的振动特性。Bi2ZnOB2O6基质的低声子能量允许稀土离子之间进行有效的声子辅助能量转移和/或稀土离子的多声子弛豫过程。结果表明，对于Bi2ZnOB2O6:Er3+，在980nm激发下，1.5μm发射强度随Er3+浓度增加（从0.5at%增加到3.0at%）而增强；而对于共掺Bi2ZnOB2O6:Yb3+/Er3+体系，在最佳Yb3+/Er3+浓度（1.5/0.5at%）下，该发射强度显著增加。此外，对于所有研究样品，1.5μm发射强度均随温度升高而降低。另外，Bi2ZnOB2O6:Yb3+/Er3+粉末在980nm激发下在可见光范围内表现出有效的上转换发光。在Bi2ZnOB2O6:Yb3+/Er3+粉末的上转换光谱中，检测到了与Er3+离子绿色和红色发射相对应的谱带（分别为2H11/2→4I15/2/4S3/2→4I15/2和4F9/2→4I15/2跃迁），以及与Bi2ZnOB2O6基质产生二次谐波相关的约487nm处的谱带（蓝色发射）。结果表明Bi2ZnOB2O6:Yb3+/Er3+粉末作为有效的多功能新一代光子材料具有应用潜力。
