Er3+离子掺杂钡镓锗玻璃上转换发光机理研究

研究了Er³⁺离子掺杂钡镓锗玻璃的吸收光谱、拉曼光谱和上转换光谱.分析了Er³⁺离子在钡镓锗玻璃中的上转换发光机理.结果表明：玻璃的最大声子能量为828cm^-1，紫外截止波长为275nm.采用800nm和980nmLD激发玻璃样品，在室温下观察到强烈的上转换绿光和红光发射.随着Er³⁺离子浓度的增加，绿光发光强度先增加后减小，而红光发光强度呈单调递增趋势.能量分析表明：800nmLD激发产生的绿光主要源于Er³⁺离子4I_13/2能级的激发态吸收过程；红光发射主要源于Er³⁺离子4I_13/2能级与4I_11/2能级之间的能量转移过程.980nmLD激发产生的绿光主要源于Er³⁺离子4I_11/2能级之间的能量转移过程；而红光发射主要源于Er³⁺离子4I_13/2能级与4I_11/2能级之间的能量转移过程和4I_13/2能级的激发态吸收过程.通过量子效率分析，发现采用800nmLD激发Er³⁺离子掺杂浓度为1mol% 的样品时，上转换绿光发光效率最高. 关键词： 上转换发光机理 3+离子掺杂')" href="#">Er³⁺离子掺杂 钡镓锗玻璃

Upconversion luminescence mechanisms of Er3+-doped barium gallogermanate glasses

The absorption, Raman and upconversion luminescence spectra of Er³⁺-doped barium gallogermanate glasses have been measured and the upconversion mechanisms of Er³⁺-doped barium gallogermanate glasses have been analyzed. The absorption and Raman spectra show that barium gallogermanate glasses have the ultraviolet absorption edge of 275nm and the maximum vibrational energy of 828cm-1, respectively. Intense green and red emissions, excited by 800nm and 980nm laser diode, were observed at room temperature. With increasing Er³⁺ ion concentration, the green emission increases initially and then decreases, while the red emissions increases monotonicly. Under the excitation of 800nm laser diode, the green emission is mainly attributed to the excited state absorption from the 4I_13/2 level and the red emission to the energy transfer between the 4I_13/2 level and the 4I_11/2 level. Under the 980nm laser diode excitation, the green emission mainly originates from the energy transfer between the 4I_11/2 levels and the red emission from the energy transfer between the 4I_13/2 and 4I_11/2 levels as well as the excited state absorption of the 4I_13/2 level. The calculation results of quantum efficiency for different pumping wavelengths show that the upconversion efficiency of the green emission in barium gallogermanate glass with 1mol% Er³⁺ ions reaches a maximum value under the excitation of 800nm laser diode.