文献类型：期刊文献

中文题名：气悬浮技术制备Er^(3+)/Yb^(3+)共掺La_(2)O_(3)-TiO_(2)-Gd_(2)O_(3)玻璃及其发光性能研究

英文题名：Er^(3+)/Yb^(3+)co-doped La_(2)O_(3)–TiO_(2)–Gd_(2)O_(3) glasses with upconversion luminescence properties prepared by aerodynamic container-less levitation

作者：于惠梅[1];蒋明达[1];张明辉[2];董旭[1];滕鑫[1]

机构：[1]华东理工大学材料科学与工程学院,上海200237;[2]中国科学院上海硅酸盐研究所关键陶瓷材料全国重点实验室,上海200050

年份：2026

卷号：43

期号：4

起止页码：95

中文期刊名：实验技术与管理

外文期刊名：Experimental Technology and Management

收录：;北大核心:【北大核心2023】；

基金：上海基础研究计划“自然科学基金”(25ZR1401086)。

语种：中文

中文关键词：钛酸盐玻璃;气悬浮技术;热稳定性;上转换发光

外文关键词：titanate glass;aerodynamic levitation;thermal stability;upconversion luminescence

摘要：无容器悬浮技术是随着航天科技的发展而产生的,最初被用来进行地面条件下的等效微重力模拟,它可以模拟空间环境中的无容器状态,已经成为特殊结构和功能材料制备以及材料基础研究的重要方法。该实验设计以无容器气悬浮技术制备了Er^(3+)/Yb^(3+)共掺杂La_(2)O_(3)-Ti O_(2)-Gd_(2)O_(3)(LTG)新型发光玻璃,并研究了不同Gd_(2)O_(3)浓度对这种新型氧化物玻璃的热特性和上转换发光强度的影响。实验结果表明,随着Gd_(2)O_(3)浓度上升,LTG玻璃的玻璃化转变温度T_(g)、析晶起始温度T_(c)、析晶温度T_(p)的值下降,上转换发光先增强再减弱,绿光发光强度明显强于红光发光强度。当Gd_(2)O_(3)浓度x=0.15%时,玻璃的发光强度最强。535和553 nm的绿色荧光上转换发光机制是由Er^(3+)离子由其所处能级向基态跃迁,而622 nm的红色荧光来自Er^(3+)离子的^(4)F_(9/2)能级向基态跃迁,这种高效率和稳定性好的上转换发光材料,在照明和荧光标记等领域具有潜在应用价值。
[Objective]Container-less levitation technology,originally developed for simulating microgravity conditions in space,has become a crucial method for preparing advanced materials free from contamination and heterogeneous nucleation caused by containers.This technique is particularly valuable for synthesizing heavy-metal oxide glasses,which are challenging to produce using conventional melting methods due to their poor glass-forming ability and the need for rapid cooling.This study used aerodynamic levitation to fabricate novel Er^(3+)/Yb^(3+)co-doped La_(2)O_(3)–TiO_(2)–Gd_(2)O_(3)(LTG)glasses and systematically investigated how different Gd_(2)O_(3) concentrations affected the thermal stability and upconversion luminescence properties of the glasses.The goal was to develop high-performance upconversion materials for potential applications in solid-state lasers,optical temperature sensors,and biological labeling systems.[Methods]Glasses with the nominal composition(La_(0.78?x)Gd_(x)Er_(0.04)Yb_(0.18))Ti_(2.25)O_(6)(where x=0.10%,0.15%,0.20%,0.25%,0.30%,or 0.35%)were prepared using an aerodynamic levitation furnace.High-purity oxide powders were thoroughly mixed,pressed into rods,and introduced into the levitator.The samples were levitated and melted using a CO_(2) laser in an oxygen atmosphere,followed by rapid cooling to form spherical glass beads with a diameter of~3 mm.The amorphous nature of the obtained glasses was confirmed through X-ray diffraction(XRD).Thermal properties,including the glass transition temperature(T_(g)),onset crystallization temperature(T_(c)),and crystallization peak temperature(T_(p)),were determined through simultaneous thermal analysis(STA)at a heating rate of 10 K/min.Upconversion luminescence spectra were recorded under 980 nm laser excitation using a fluorescence spectrophotometer equipped with a photomultiplier tube.[Results]XRD patterns confirmed the amorphous structure of all prepared LTG samples.DTA results indicated that T_(g),T_(c),and T_(p) decreased with increasing Gd_(2)O_(3) concentration.The thermal stability parameter(ΔT=T_(c)?T_(g)),which reflects the glass-forming ability,also decreased from 59.4℃ to 42.6℃ as Gd_(2)O_(3) concentration increased from 0.10%to 0.35%,suggesting a reduction in the thermal stability and glass-forming tendency with increasing Gd_(2)O_(3) concentration.Under 980 nm laser excitation,intense green and red upconversion emissions were observed.The emission bands centered at 535,553,and 672 nm corresponded to the ^(2)H_(11/2)→^(4)I_(15/2),^(4)S_(3/2)→^(4)I_(15/2),and ^(4)F_(9/2)→^(4)I_(15/2) transitions of Er^(3+),respectively.The green emission(553 nm)was notably more intense than the red emission across all compositions.The integrated upconversion luminescence intensity initially increased with increasing Gd_(2)O_(3) concentration and peaked at x=0.15%before decreasing.Furthermore,the ratio of green-to-red emission intensity exhibited a nonmonotonic trend:it first increased and then decreased,indicating that high Gd_(2)O_(3) concentrations favored red emissions over green emissions.The upconversion mechanism involved ground-state absorption and energy transfer processes from Yb^(3+)to Er^(3+),followed by excited-state absorption,leading to the filling of high-energy levels and subsequent radiative transitions.[Conclusions]This study successfully demonstrated the effectiveness of aerodynamic levitation for fabricating Er^(3+)/Yb^(3+)co-doped LTG heavy-metal oxide glasses,which are difficult to produce by conventional methods.Gd_(2)O_(3) significantly affected both the thermal and luminescent properties of the glasses.Although increasing Gd_(2)O_(3) concentration reduced thermal stability,it enabled the upconversion emission intensity and color ratio to be adjusted,with optimal luminescence performance achieved at a Gd_(2)O_(3) concentration of x=0.15%.The strong green emissions underscore the potential of these LTG glasses for various photonic applications.The combination of container-less processing and strategic compositional design provides a robust approach for developing new functional glass materials with tailored properties.