Optical transitions and upconversion properties of Er3+-doped chloride tellurite glasses

• 来源期刊: 中国物理（英文版）
• 关键词: upconversion material chloride tellurite glass spectroscopy Er3+ ion
• 年，卷（期）: 2004,（2）
• 页码范围: 258-263
• 页数: 6页
• 语种: 英文

摘要

Er3+-doped lead chloride tellurite glasses were prepared using the conventional melting and quenching method.The absorption spectra were measured and the Judd-Ofelt analysis was performed. The spectroscopic parameters such as the intensity parameters, transition probabilities, radiative lifetimes, and branching ratios were obtained. Intense infrared emission and visible upconversion luminescence under 976nm excitation were observed. For the 1.55μm emission, the full width at half maximum and the emission cross sections are more than 50 nm and 8×10-20cm2,respectively. Three efficient visible luminescences centred at 525, 547, and 658 nm are assigned to the transitions from the excited states 2H11/2, 4S3/2, and 4F9/2 to the ground state 4I15/2, respectively. The upconversion mechanisms and the power-dependent intensities are also discussed and evaluated.