共查询到19条相似文献,搜索用时 93 毫秒
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掺铒硅光致发光激子传递能量机制 总被引:2,自引:0,他引:2
铒离子在硅中呈现弱施主特性 ,O、Er双掺杂可提高施主浓度两个数量级 .氧杂质与铒离子形成复合体 ,其施主能级可能是铒离子发光能量转换的重要通道 .提出了掺铒硅光致发光激子传递能量模型 ,建立了发光动力学速率方程 ,并进行了详细推导 .发光效率与光激活铒离子浓度、激发态寿命及自发辐射寿命等因素有关 .指出铒离子 -束缚激子复合体的热离化和激发态铒离子能量反向传递是引起铒离子发光温度猝灭的主要原因 .拟合 PL测量实验结果表明 :它们对应的激活能分别为 6.6me V和 47.4me V. 相似文献
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硅在微电子学领域有着极其广泛的应用,但它是一种间接能隙半导体,发光器件领域是它的缺项。利用在硅中掺入铒发光中心,研制出一种新的发光二极管(Si:ErLED),它的发光波长为1.54μm,恰好满足石英光纤通信的要求。对掺铒硅的电学特性、材料性能、发光机理等进行了总结,发现制约掺铒硅实用化的一些问题,在此基础上得出提高其发光效率的途径,并介绍了掺铒硅器件的行为和未来展望。 相似文献
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Er-doped silicon-rich silicon nitride (SRN) films were deposited on silicon substrate by an RF magnetron reaction sputtering system. After high temperature annealing, the films show intense photoluminescence in both the visible and infrared regions. Besides broad-band luminescence centered at 780 nm which originates from silicon nanocrystals, resolved peaks due to transitions from all high energy levels up to 2H11/2 to the ground state of Er^3+ are observed. Raman spectra and HRTEM measurements have been performed to investigate the structure of thefilms, and possible excitation processes are discussed. 相似文献
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掺铒a-Si:H,O薄膜1.54μm光致发光和微结构 总被引:2,自引:0,他引:2
采用等离子化学气相淀积方法,改变SiH4和H2O的流量比制备含有不同氧浓度的a-Si:H,薄膜,用离子注入方法掺入铒,经300-935℃快速热退火,在波长1.54μm处观察到很强的室温光致发光。氧的加入可以大大提高铒离子的发光强度,并且发光强度随氧含量的变化有一个类似于高斯曲线的分布关系,不是单调地随氧含量的增加而增强,研究了掺铒a-Si:H,O薄膜和微结构,讨论了发光强度与薄膜微结构的关系。 相似文献
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掺铒玻璃样品的荧光谱测量 总被引:5,自引:0,他引:5
介绍了一种掺Er^3 玻璃样品的制作方法,测量掺Er^3 玻璃样品的透射光和反射光的荧光谱特性、样品在双向泵浦时的荧光谱特性及吸收谱特性。实验结果表明,透射光的荧光谱强度大于反射光的荧光谱强度;当反射光实验中掺Er^3 玻璃样品的背面贴有镀Al反射镜时,反射光荧光谱强度则大于透射光荧光谱强度,双向泵浦的荧光谱证明,荧光谱强度与泵浦激光器的输出波长有关。 相似文献
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基于可调谐掺铒光纤激光器和掺铒光纤放大器的光声光谱气体分析仪 总被引:2,自引:1,他引:1
光声光谱技术用于检测低浓度乙炔气体具有灵敏度高、连续和快速实时在线测量的特点.采用近红外可调谐掺铒光纤激光器(TEDFL)串接大功率掺铒光纤放大器(EDFA)作光源,采用一阶纵向共振式双程吸收光声池,并运用波长调制和二次谐波榆测技术,研制出一种新的高灵敏度微量气体近红外光声光谱分析仪.在常温常压下对低浓度乙炔气体的实验测量结果表明,该系统的极限检测灵敏度达到1.3×10-9,其线性响应相关度达到0.99957,能够满足工业、环境监测和电力系统等对乙炔检测和分析的需要. 相似文献
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Using solar energy through green and simple artificial photosynthesis systems are considered as a promising way to solve the energy and environmental crisis. However, one of the important primary steps of photosynthesis, i.e., energy transfer, is long being ignored especially in inorganic semiconducting systems due to the small exciton binding energies. Herein, the simultaneous interrogation of the charge transfer and energy transfer steps in a photoexcitation process is proposed by utilizing few-layered nanosheet-assembled hierarchical BiOBr nanotubes with rich oxygen vacancies (OVs) as efficient multifunctional photocatalysts. Benefiting from the integrated 1D/2D structure and abundant OV defects, the excitonic effect strikes a delicate balance in the optimized BiOBr photocatalyst, showing not only improved charge carrier separation and transfer but also enhanced exciton generation. As a result, the hierarchical BiOBr nanotubes exhibit high efficiency toward photocatalytic CO2 reduction with an impressive CO evolution rate of 135.6 µmol g−1 h−1 without cocatalyst or photosensitizer. The dominant reactive oxygen species of singlet oxygen (1O2) are discriminated for the first time, which originated from an energy transfer process, with electrophilic character, whereas the minor effect of superoxide anion radical (•O2−) with a nucleophilic rate-determining step in the photocatalytic aerobic oxidation of sulfides. 相似文献
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掺铒光纤激光器的热效应邱明新,M.A.Rebolledo,J.M.Alvarez,S.Jarabo,D.Booth(上海市激光技术研究所200233)ThermalEffectsinErbiumDopedSilicaFiberLasers¥QiuMi... 相似文献
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通过研究 EDFA主要性能指标与其内外部工作条件的关系 ,探讨了有关实现 EDFA自适应的技术。在此基础上 ,提出了一种新的自适应 EDFA,它可以达到 5 0 d B以上的大动态范围 ,既可用于小信号光放大也可用于光功率放大。 相似文献
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