作　　者： ; ; ;

机构地区： 华南理工大学材料科学与工程学院特种功能材料教育部重点实验室

出　　处： 《武汉理工大学学报》 2007年第E01期335-339,共5页

摘　　要： 研究了808nm和977nm激光二极管泵浦下铥／镱共掺TeO3～Ga2O3-BaO-ZnO玻璃光谱特性并讨论了Tm^3＋离子浓度对上转换光谱的影响。在977nm激光二极管泵浦下，观测到Tm^3＋／Yb^3＋共掺碲镓酸盐玻璃强476nm上转换蓝色（^1G4→^3H6）和较弱的650nm上转换红色（^1G4→^3F4和^3F2．3→^3H6）荧光。分析表明476nm蓝光辐射为三光子吸收过程．650nm红光为双光子和三光子混合吸收过程；在808nm激光二极管泵浦下，上转换蓝色荧光为双光子吸收过程。实验发现．随Tm^3＋离子掺杂浓度的增加，Tm^3＋离子的上转换荧光强度也随之增加，当Tm2O3掺杂浓度超过0．2mol％时，荧光强度开始下降，出现明显荧光猝灭现象；当Tm^3＋为0．3mol％时，蓝光对红光的强度比为8倍。 This paper reports on upconversion properties of Tm^3＋/Yb^3＋ co-doped TeO2-Ga2O3-BaO-ZnO glasses under excitation of 977 nm and 808 nm laser diodes （LD） and effects of Tm^3＋ concentration on the upconversion emission have been also discussed. An intense upconversion emission centered at 476 nm （blue） along with a weak emission at 650 nm （red） has been observed upon excitation of 977 nm LD, assigned to the transitions of ^1G4→^3H6 and ^1G4→^3F4 and/or ^3F2.3→^3H6 of Tm^3＋ , respectively. The 476 nm upconversion intensify has a cubelike dependence on incident pump laser power, indicating a three-photon process. However, a quadratic dependence of the 476 um upconversion intensity on the incident pump laser power has been observed when samples under excitation of 808 nm LD, due to two-photon absorption process. It is noticed that concentration quenching of Tm^3＋ to upconversion fluorescence is observed when the content of Tm^3＋ is about 0.2 mol%. The ratio of blue and red luminescence intensities reaches the peak value 8 while Tm^3＋ is 0.3 mol%. As a result, Tm^3＋/Yb^3＋ co-doped TGBZ glasses might be a potential candidate for developing solid-state compact blue-emitting lasers.

关 键 词： 碲镓酸盐玻璃 铥浓度 铥镱共掺 上转换

领　　域： [化学工程] [化学工程]