摘要
采用熔融猝灭方法制备了掺杂不同浓度Er3+离子的铌磷酸盐玻璃材料,测量了该材料的吸收光谱、发射光谱和荧光寿命。计算了在该玻璃材料中Er3+的光学跃迁强度参数,同时计算了部分能级之间光学跃迁的振子强度、跃迁几率以及辐射跃迁寿命。应用两种不同的方法计算了4I13/2→I15/2受激发射截面,结果证明存在的自吸收很小。荧光寿命随浓度的变化关系表明,4I13/2能级的能量传递是电偶极类型的,同时证明在低浓度下该能级的量子效率接近100％。所有这些研究结果表明,该材料可能成为新的集成光学器件材料的候选者。
1.5mm emission from the first excited state to the ground state of Er3+ is very important for the applications in integrated optics and lasers. And we know that for a given transition of trivalent rare earth ions its properties mainly depends on the surroundings, say, host where the rare earth ions are inside. At this point, in order to find a better host material to incorporate the Er3+ a lot of kinds of materials, such as sulfide, chloride, fluoride, oxide glasses, and some kinds of crystals have been studied. Finally, amongst these materials the phosphate glass is thought to be a promising candidate for practical application. But there are problems still left to be solved, like chemical stability, lower transition temperature, and so on.
In the present paper, a special host glass composition has been designed. Three samples with different Er concentration have been produced. Absorption spectra for these samples have been measured, the calculation results of absorption cross sections for the samples indicated that for a certain transition they are analogous. J-O parameters have been obtained to be 4.4(Ω2), 1.3(Ω4) and 1.1×10-2cm2(Ω6). Using the J-O parameters the oscillator strengths, radiative transition probabilities for other transitions and radiative transition lifetimes for some levels have been derived. Emission cross sections for the transition 4I13/2→I15/2 have been obtained by using absorption spectra data or emission spectra data. A comparison between the emission cross sections derived from different approaches shows that week reabsorption is existent even in the sample containing 5% of Er3+ , this fact implies that Er3+ doped this kind of material is suitable for the application in integrated optics. Fluorescence decay for the transition 4I13/2→ 4I15/2 room temperature has been measured for the samples with different Er3+ concentration. It is shown that for all the samples, its fluorescence decay lines obey the single exponential function. Through some calculations it could be conc
出处
《发光学报》
EI
CAS
CSCD
北大核心
2003年第6期624-631,共8页
Chinese Journal of Luminescence
基金
国家自然科学基金(50172046)
吉林省自然科学基金(19990514
20030514-2)
国家"863"计划(2002AA311160)资助项目
