Sm^(3+)-doped materials exhibit red and orange emissions in the visible light region,showing broad applica⁃tion prospects in both laser and display material fields.However,the inherent small emission and absorption cr...Sm^(3+)-doped materials exhibit red and orange emissions in the visible light region,showing broad applica⁃tion prospects in both laser and display material fields.However,the inherent small emission and absorption cross-sections of Sm^(3+)result in low luminous efficiency,posing challenges for achieving high-quality solid-state lighting.Here,the excellent white emission of Sm^(3+)doped lithium aluminum silicate(LAS)glass was realized by introducing the Ag aggregates through Ag ion exchange.Under 395 nm excitation,the Ag-doped samples exhibit significant fluo⁃rescence enhancement with color coordinates close to the equal energy white point E(0.33,0.33)and a color ren⁃dering index(CRI)of 81.8.The study reveals that the surface plasmon resonance(SPR)effect of Ag nanoparticles enhances the luminescence of Sm^(3+),while the energy transfer mechanism between Ag^(+)and Sm^(3+)also promotes fluores⁃cence enhancement.By adjusting the concentration of AgNO_(3) and the exchange time,a series of high-quality full-spectrum white light emissions were obtained,indicating that the Ag ion-exchanged Sm^(3+)-doped LAS glass has good application potential in the development of solid-state lighting devices.Moreover,variations in the excitation wave⁃length can effectively tune the emission color,further demonstrating the tunability and practicality of this material in optoelectronic applications.展开更多
SiO_(2)-BaO基微晶玻璃以其膨胀系数高、耐高性能优异而成为耐高密封领域研究的热点,但稀土氧化物对该类封接玻璃改性的影响研究尚不多见。本工作研究不同高阳离子场强(Cation field strength,CFS)的稀土氧化物取代传统碱土氧化物BaO对...SiO_(2)-BaO基微晶玻璃以其膨胀系数高、耐高性能优异而成为耐高密封领域研究的热点,但稀土氧化物对该类封接玻璃改性的影响研究尚不多见。本工作研究不同高阳离子场强(Cation field strength,CFS)的稀土氧化物取代传统碱土氧化物BaO对新型富稀土—SiO_(2)-BaO-Ln_(2)O_(3)(SBLn,Ln=La、Sm、Er、Yb)系列玻璃的网络结构、结晶行为、微观结构和高温性能的影响。随着稀土阳离子场强由2.82(La^(3+))增大到3.98(Yb^(3+)),SBLn玻璃的玻璃转变温度(T_(g))、析晶起始温度(T_(x))、析晶峰值温度(T_(p))均逐渐增加,说明高稀土阳离子场强有利于提高SBLn玻璃的热稳定性。四类富稀土SBLn玻璃的结晶相均由BaSiO_(3)和BaSi2O5相组成,随稀土阳离子场强增大,BaSiO_(3)相减少、BaSi2O5相增多,稀土元素只存在于玻璃相中,不参与晶相析出。随着稀土阳离子场强增加,SBLn微晶玻璃的热膨胀系数(Coefficient of thermal expansion,CTE)由12.52×10^(–6)/℃增大到13.13×10^(–6)/℃(30~800℃),但析晶量下降导致软化温度从1313.5℃降至1174.1℃。总之,富稀微晶玻璃材料高热膨胀系数大于12×10^(–6)/℃、软化温度均高于1150℃,且在700℃高温下的直流电阻率大于106Ω·cm,说明富稀土微晶玻璃密封材料具有在固体氧化物燃料电池、氧传感器、铂薄膜热敏电阻器等高温场景下的应用前景。展开更多
TQ171.717 2000032131氟化物和磷酸盐玻璃中Yb<sup>3+</sup>离子掺杂浓度对其发光及荧光寿命的影响=Influence of concentration ofYb<sup>3+</sup> ions on luminescence and fluorescencelifetime in fluoroz...TQ171.717 2000032131氟化物和磷酸盐玻璃中Yb<sup>3+</sup>离子掺杂浓度对其发光及荧光寿命的影响=Influence of concentration ofYb<sup>3+</sup> ions on luminescence and fluorescencelifetime in fluorozirconate and phosphate glasses[刊,中]/张军杰,张龙,祁长鸿,林凤英,胡和方（中科院上海光机所.上海（201800））//中国激光.—1999,26（6）.—739-744测量了不同掺杂浓度下Yb<sup>3+</sup>离子在氟化物及磷酸盐玻璃中的吸收光谱、发射光谱和Yb<sup>3+</sup>离子的荧光寿命,计算了Yb<sup>3+</sup>离子的发射截面σ<sub>c</sub>,分析了Yb<sup>3+</sup>展开更多
The luminescent properties of glasses synthesized in air atmosphere by conventional high temperature process were studied. The emissions spectra of Eu2+ and Eu3+ were observed in BaO-La2O3-B2O3-Eu2O3 glasses. The resu...The luminescent properties of glasses synthesized in air atmosphere by conventional high temperature process were studied. The emissions spectra of Eu2+ and Eu3+ were observed in BaO-La2O3-B2O3-Eu2O3 glasses. The results show that the broad emission peaks at 430 nm correspond to 5d→4f emission transition of Eu2+, the sharp emission peaks at 592, 616, 650 and 750 nm correspond to 5D0→7Fj（j=1-4） emission transition of Eu3+, respectively, which indicates that the BaO-La2O3-B2O3-Eu2O3 glass can convert ultraviolet and green components of sunlight into blue and red light so as to increase the intensity of blue and red light, respectively. The luminescent intensity of Eu2+ increases with increasing the molar ratio of Tb3+ in BaO-La2O3-B2O3-Eu2O3-Tb4O7 glasses, whereas the luminescent intensity of Eu3+ decreases. So the luminescent intensity of Eu（III, II） is influenced by Tb3+. These phenomena can be explained by electron transfer mechanism: Eu3+（4f6）+Tb3+（4f8）→Eu2+（4f7）+Tb4+（4f7）. Taking advantage of the luminescent properties of BaO-La2O3-B2O3-Eu2O3 glasses, light-conversion glass for agriculture can be produced.展开更多
The energy transfer and upconversion of Er 3+ /Yb 3+ co-doped TeO2-TiO2-K2O glasses upon excitation with 976nm lasers diode were studied. The tellurite glasses were prepared by conventional melting methods. Their opti...The energy transfer and upconversion of Er 3+ /Yb 3+ co-doped TeO2-TiO2-K2O glasses upon excitation with 976nm lasers diode were studied. The tellurite glasses were prepared by conventional melting methods. Their optical properties and sensitization upconversion spectra were performed. The dependence of green upconversion luminescence intensity on the mole ratio of Yb 3+ to Er 3+ and Er 3+ concentration were discussed in detail. When the mole ratio of Yb 3+ to Er 3+ is 25/1 and Er 3+ concentration is 0.1% （mole fraction）, or when the mole ratio of Yb 3+ to Er 3+ is 10/1 and Er 3+ concentration is 0.15%, the optimal upconversion luminescence intensity is obtained. The obtained glasses can be one of the potential candidates for lasers-diode pumping microchip solid-state lasers.展开更多
文摘Sm^(3+)-doped materials exhibit red and orange emissions in the visible light region,showing broad applica⁃tion prospects in both laser and display material fields.However,the inherent small emission and absorption cross-sections of Sm^(3+)result in low luminous efficiency,posing challenges for achieving high-quality solid-state lighting.Here,the excellent white emission of Sm^(3+)doped lithium aluminum silicate(LAS)glass was realized by introducing the Ag aggregates through Ag ion exchange.Under 395 nm excitation,the Ag-doped samples exhibit significant fluo⁃rescence enhancement with color coordinates close to the equal energy white point E(0.33,0.33)and a color ren⁃dering index(CRI)of 81.8.The study reveals that the surface plasmon resonance(SPR)effect of Ag nanoparticles enhances the luminescence of Sm^(3+),while the energy transfer mechanism between Ag^(+)and Sm^(3+)also promotes fluores⁃cence enhancement.By adjusting the concentration of AgNO_(3) and the exchange time,a series of high-quality full-spectrum white light emissions were obtained,indicating that the Ag ion-exchanged Sm^(3+)-doped LAS glass has good application potential in the development of solid-state lighting devices.Moreover,variations in the excitation wave⁃length can effectively tune the emission color,further demonstrating the tunability and practicality of this material in optoelectronic applications.
文摘SiO_(2)-BaO基微晶玻璃以其膨胀系数高、耐高性能优异而成为耐高密封领域研究的热点,但稀土氧化物对该类封接玻璃改性的影响研究尚不多见。本工作研究不同高阳离子场强(Cation field strength,CFS)的稀土氧化物取代传统碱土氧化物BaO对新型富稀土—SiO_(2)-BaO-Ln_(2)O_(3)(SBLn,Ln=La、Sm、Er、Yb)系列玻璃的网络结构、结晶行为、微观结构和高温性能的影响。随着稀土阳离子场强由2.82(La^(3+))增大到3.98(Yb^(3+)),SBLn玻璃的玻璃转变温度(T_(g))、析晶起始温度(T_(x))、析晶峰值温度(T_(p))均逐渐增加,说明高稀土阳离子场强有利于提高SBLn玻璃的热稳定性。四类富稀土SBLn玻璃的结晶相均由BaSiO_(3)和BaSi2O5相组成,随稀土阳离子场强增大,BaSiO_(3)相减少、BaSi2O5相增多,稀土元素只存在于玻璃相中,不参与晶相析出。随着稀土阳离子场强增加,SBLn微晶玻璃的热膨胀系数(Coefficient of thermal expansion,CTE)由12.52×10^(–6)/℃增大到13.13×10^(–6)/℃(30~800℃),但析晶量下降导致软化温度从1313.5℃降至1174.1℃。总之,富稀微晶玻璃材料高热膨胀系数大于12×10^(–6)/℃、软化温度均高于1150℃,且在700℃高温下的直流电阻率大于106Ω·cm,说明富稀土微晶玻璃密封材料具有在固体氧化物燃料电池、氧传感器、铂薄膜热敏电阻器等高温场景下的应用前景。
文摘TQ171.717 2000032131氟化物和磷酸盐玻璃中Yb<sup>3+</sup>离子掺杂浓度对其发光及荧光寿命的影响=Influence of concentration ofYb<sup>3+</sup> ions on luminescence and fluorescencelifetime in fluorozirconate and phosphate glasses[刊,中]/张军杰,张龙,祁长鸿,林凤英,胡和方（中科院上海光机所.上海（201800））//中国激光.—1999,26（6）.—739-744测量了不同掺杂浓度下Yb<sup>3+</sup>离子在氟化物及磷酸盐玻璃中的吸收光谱、发射光谱和Yb<sup>3+</sup>离子的荧光寿命,计算了Yb<sup>3+</sup>离子的发射截面σ<sub>c</sub>,分析了Yb<sup>3+</sup>
文摘The luminescent properties of glasses synthesized in air atmosphere by conventional high temperature process were studied. The emissions spectra of Eu2+ and Eu3+ were observed in BaO-La2O3-B2O3-Eu2O3 glasses. The results show that the broad emission peaks at 430 nm correspond to 5d→4f emission transition of Eu2+, the sharp emission peaks at 592, 616, 650 and 750 nm correspond to 5D0→7Fj（j=1-4） emission transition of Eu3+, respectively, which indicates that the BaO-La2O3-B2O3-Eu2O3 glass can convert ultraviolet and green components of sunlight into blue and red light so as to increase the intensity of blue and red light, respectively. The luminescent intensity of Eu2+ increases with increasing the molar ratio of Tb3+ in BaO-La2O3-B2O3-Eu2O3-Tb4O7 glasses, whereas the luminescent intensity of Eu3+ decreases. So the luminescent intensity of Eu（III, II） is influenced by Tb3+. These phenomena can be explained by electron transfer mechanism: Eu3+（4f6）+Tb3+（4f8）→Eu2+（4f7）+Tb4+（4f7）. Taking advantage of the luminescent properties of BaO-La2O3-B2O3-Eu2O3 glasses, light-conversion glass for agriculture can be produced.
基金Projects(2004Z2-D0131 and 2004A10602002) supported by the Science and Technology Programof Guangzhou , Guang-dong Province project(60307004 and 50472053) supported by the National Natural Science Foundation of China project(04200036) sup-ported by the Natural Foundation of Guangdong Province
文摘The energy transfer and upconversion of Er 3+ /Yb 3+ co-doped TeO2-TiO2-K2O glasses upon excitation with 976nm lasers diode were studied. The tellurite glasses were prepared by conventional melting methods. Their optical properties and sensitization upconversion spectra were performed. The dependence of green upconversion luminescence intensity on the mole ratio of Yb 3+ to Er 3+ and Er 3+ concentration were discussed in detail. When the mole ratio of Yb 3+ to Er 3+ is 25/1 and Er 3+ concentration is 0.1% （mole fraction）, or when the mole ratio of Yb 3+ to Er 3+ is 10/1 and Er 3+ concentration is 0.15%, the optimal upconversion luminescence intensity is obtained. The obtained glasses can be one of the potential candidates for lasers-diode pumping microchip solid-state lasers.
