Novel Er-doped PbO and B₂O₃ based glasses: investigation of quantum efficiency and non-radiative transition probability for 1.5 μm broadband emission fluorescence

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• 作者：Chen ; Qiuping ; Ferraris ; Monica ; Milanese ; Daniel ; Menke ; Yvonne ; Monchiero ; Elena ; Perrone ; Guido
• 关键词：R118 ; B140 ; L220 ; 42.70.C ; 78.20.C ; 42.70.H
• 刊名：Journal of Non-Crystalline Solids
• 出版年：2003
• 期刊代码：50_00223093
• 类别：ms
• 出版时间：August 15, 2003
• 卷：324
• 期：1-2
• 页码：12-20
• 文件大小：327 K

摘要

Er³⁺-doped PbO:B₂O₃, PbO:Ga₂O₃:B₂O₃, PbO:Bi₂O₃:B₂O₃ and PbO:Ga₂O₃:Bi₂O₃:B₂O₃ showing broadband 1.5 μm absorption and emission are reported and their emission spectra, radiative, non-radiative transition probabilities, fluorescence lifetime, and their quantum efficiency were studied. It was found that glasses with high refractive index (1.78–1.94) had high spontaneous transition probability A_j^′j (172.93–245.98 s⁻¹). FT-IR spectra for such glasses were carried out in order to investigate their vibration frequency and phonon energy. The phonon energy for such glasses (1375–1200 cm⁻¹) decreased with increasing PbO content. The multiphonon relaxation for all glass samples was not a dominating factor for the non-radiative transition process. The high non-radiative transition rates (254.02–613.32 s⁻¹) therefore should be due to energy transfer to the impurities (OH groups) and cross-relaxations in these glasses, which can be minimized.