摘要
用熔融淬冷法制备了掺Er3+的80GeS2-10In2S3-10CsI(mol%)硫卤玻璃样品,测试了样品的热学稳定性、喇曼光谱、吸收光谱以及上转换光谱,分析了Er3+离子在该玻璃中的上转换发光机理.应用Judd-Ofelt理论计算分析了Er3+离子在该样品中的强度参量Ωt(t=2,4,6)、自发辐射跃迁几率A、荧光分支比β以及辐射寿命τrad等光谱参量.在980nmLD泵浦激发下,首次在该种玻璃中观察到强烈的绿光(526nm、549nm),分别对应于2H11/2→4I15/2和4S3/2→4I15/2的跃迁,其中549nm处绿光较强.549nm处上转换荧光寿命为0.34ms,量子效率为69%.同时研究了绿光(526nm、549nm)上转换发光强度随泵浦激发功率的变化,其发光曲线拟合斜率分别为1.71和2.03,表明绿光是双光子吸收过程.研究结果表明:掺Er3+的80GeS2-10In2S3-10CsI硫卤玻璃是一种上转换绿光激光器的潜在基质材料.
Er3＋-doped 80GeS2-10In2S3-10CsI（mol%）chalcohalide glass was fabricated by melt-quenching technique.The thermal stability,Raman spectra,absorption spectra,upconversion emission spectra of glass samples were measured,and upconversion mechanisms of Er3＋ in the glass were analyzed.The intensity parameters（Ωt,t=2,4,6）,spontaneous transition probabilities（Α）,fluorescence branching ratios（β）,and radiative lifetimes（τrad）were calculated by using the Judd-Ofelt theory.Under 980 nm diode laser excitation,intense emission bands centered at 526 nm and 549 nm corresponding to the transitions of 2H11/2→4I15/2 and 4S3/2→4I15/2,respectively,were observed for the first time in this glass,and intensity of 549 nm green light is more stronger.For 549 nm emission band,the upconversion fluorescence lifetime is 0.34 ms,and the quantum efficiency is 69%.The dependence of visible emission intensities upon excitation intensity was examined.A plot of logIUP vs logIIR yields two fitted lines with slope 1.71 and 2.03,respectively,which indicates a two-photon process for green emission.Results suggest that Er3＋-doped 80GeS2-10In2S3-10CsI chalcohalide glass may be a potential host material for upconversion green lasers.
出处
《光子学报》
EI
CAS
CSCD
北大核心
2010年第7期1163-1168,共6页
Acta Photonica Sinica
基金
国家自然基金(60878042)
中国博士后基金(20080430204)
浙江省自然基金(Y407253)资助
关键词
硫卤玻璃
荧光
上转换
ER3+
Chalcohalide glass
Fluorescence
Up-conversion
Erbium ions
