Visible upconversion in rare-earth doped gallium lanthanum sulphide based glasses
Visible upconversion in rare-earth doped gallium lanthanum sulphide based glasses
复制标题
稀土掺杂硫化镓镧基玻璃中的可见光上转换
DOI：
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发表时间：
1998
期刊：
影响因子：
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通讯作者：
D. Payne
中科院分区：
文献类型：
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作者：
T. Schweizer;J. Hector;D. Brady;Ji Wang;D. Hewak;W. Brocklesby;D. Payne
硫系玻璃通常以其良好的红外和差的可见光透明性而闻名，这限制了其在红外波长区域的被动和主动器件中的应用。然而，镓镧硫化物玻璃显示出低至500 nm的可见光透明度。与常用的氟锆酸盐玻璃相比，玻璃的低声子能量增加了稀土能级的辐射量子效率，并为有效的两步激发到可见能级提供了长寿命的中间能级。在掺Pr ~（3+）、Nd ~（3+）、Ho ~（3+）和Er ~（3+）的玻璃中，利用Ti：Sapphire激光器泵浦，在二极管激光器容易获得的波长范围内，观察到了绿色和红色的上转换发光。寿命测量表明，激发过程是激发态吸收或上转换引起的离子-离子相互作用。用氧化镧或氯化铯改性玻璃，可提高玻璃的可见光透过率，使紫外吸收限分别移至450 nm和400 nm，并改善玻璃的拉丝性能
Chalcogenide glasses are usually known for their good infrared and poor visible transparency which limit their applications to passive and active devices in the infrared wavelength region. Gallium lanthanum sulphide glasses, however, show visible transparency down to 500nm. The low phonon energy of the glass increases the radiative quantum efficiency of rare-earth energy levels compared to commonly used fluorozirconate glasses and provides long-lived intermediate levels for efficient two-step excitation to visible energy levels. Green and red upconversion emission has been observed in Pr3+, Nd3+, Ho3+, and Er3+ doped glasses under Ti:sapphire pumping in wavelengths regions where diode laser sources are easily available. Lifetime measurements reveal the excitation process is either excited-state absorption or upconversion caused by ion-ion interactions. Modification of the glass with lanthanum oxide or ceasium chloride improves the visible transparency and shifts the UV absorption edge to 450nm and 400nm, respectively, and also improves the fibre drawing of these glasses