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题名	量子点掺杂硅酸盐玻璃量子点掺杂硅酸盐玻璃量子点掺杂硅酸盐玻璃量子点掺杂硅酸盐玻璃量子点掺杂硅酸盐玻璃量子点掺杂硅酸盐玻璃制备及其制备及其制备及其光学性能研究光学性能研究光学性能研究
作者	王何宁
文献子类	硕士
导师	赵全忠
关键词	双光子荧光 Two-photon absorption 量子点掺杂玻璃 Glass doped with QDs 光谱分析 Spectrum 光学特性 Optical properties
其他题名	Preparation of quantum dots doped silicate glasses and their optical properties
英文摘要	量子点（quantum dots, QDs）是一种三维受限的半导体纳米颗粒，具有独特的量子效应。量子点掺杂玻璃因其在信息科学、激光技术与生物系统成像等领域中的广阔应用前景而得到了研究人员的普遍重视。本文对CdTe/CdSe量子点掺杂玻璃的线性及非线性光学性质进行了分析，并对PbTe玻璃的发光现象进行了研究。主要工作如下： 采用高温熔融法制备CdTe量子点掺杂的硅酸盐玻璃，对CdTe量子点掺杂玻璃的线性及非线性光学性质进行测试与分析。结果表明，玻璃因CdTe量子点析出而产生量子尺寸效应，尺寸增大，能隙增宽，吸收和荧光光谱峰位红移；飞秒激光成功激发样品的上转换荧光，并根据荧光强度与入射光功率的关系: ，分析得出此上转换荧光为双光子诱导荧光。样品具有优异的非线性光学性能，非线性吸收系数β经开孔Z扫描进行测试，最高可达3.62x10-11m/W，有望应用于光开关、光限幅等非线性光电子器件。 通过高温熔融热处理法制备了CdSe量子点掺杂的硅酸盐玻璃，研究了热处理温度与时间对玻璃内部CdSe量子点尺寸和浓度的影响。结果显示，随着热处理时间增长，温度增加，量子点尺寸增大，浓度增加，导致样品吸收光谱峰位红移，绝对吸光度增强。TEM测试CdSe量子点的形貌和尺寸，晶格间距0.260nm对应CdSe的(020)晶面。测试其拉曼光谱得CdSe的LO峰为208cm-1。荧光测试得到CdSe量子点在400nm激发光源下的的本征发射峰564nm。由于CdSe量子点易形成、制备简单等特性，常用作制备滤波片等光学器件。 PbTe掺杂的硅酸盐玻璃在可见光波段发现两个发光中心，一为254nm紫外灯激发下明亮的蓝色荧光，二为365nm紫外灯激发下较弱的橙红色荧光，改变掺杂浓度，发现两种荧光的发光物质不同。蓝色荧光是由Pb2+离子的 中 (A波段)或者电荷转移跃迁（D波段）能级跃迁产生的，红色荧光则可能与Pb2+离子代替常规的Zn2+的位置，与Te2-或者O2-造成的缺陷进行电荷转移有关。; Quantum dots (QDs) are three-dimensionally confined semiconductor nanoparticles with very small sizes, so small that their optical and electronic properties are determined by its physical properties and size distribution. QDs-doped glass has received widespread attention from researchers due to its broad application prospects in fields such as information science, laser technology and biological system imaging. In the paper, CdTe/CdSe QDs-doped glasses were prepared by melt-quenching technique. Heat-treatment leads to the precipitation of QDs in glasses. The size and concentration of QDs were tuned by the heat-treated temperature and time. Their nonlinear absorption properties were studied by Z-scan methods. In addition, the luminescence of PbTe doped glass was studied. The article could be divided into several parts: Silicate glasses doped with CdTe QDs were home fabricated through conventional melt-quenching technique. Raman analysis confirms the precipitation of CdTe QDs, and their red-shifted optical absorption and emission properties exhibit a dependence on QD size. Meanwhile, the upconversion luminescence of CdTe QDs in silicate glasses excited by infrared femtosecond laser was demonstrated to be two-photon induced luminescence by the dependence of fluorescence intensity on laser pump power. Two-photon induced luminescence was achieved by both 800 nm and 960 nm femtosecond laser pulses. And the nonlinear absorption coefficients of samples were obtained by the open aperture measurement of Z-scan which can up to 3.62x10-11m/W; CdSe QDs doped silicate glasses were successfully fabricated by conventional melt-quenching technique. Heat-treatment leads to the precipitation of CdSe QDs in silicate glasses. Raman analysis and TEM test verified the formation of CdSe QDs. For the heated glass at 510℃ for 8h, the average QD-size is 4.6nm, crystal spacing is 0.260nm which corresponding to the (020) crystal plane of CdSe, and the fluorescence peak 564nm at 400nm lamp excitation are the intrinsic emission of CdSe. The tunable optical absorption spectra of glasses embedded with CdSe QDs also shows its dependence on QD-size. PbTe doped silicate glass has two luminous center at visible spectral region. PbTe doped glass and observed a bright blue fluorescence with the irradiation of 254nm UV lamp which is attributed to the fluorescence peak of Pb2+ at the transition. And a weak orange fluorescence was observed at the irradiation of 365nm monochromatic light, that may be the result of the interaction of Pb2+ which replaced the position of Zn2+ with Te2- or O2- ions with energy level transitions. The specific principle still needs further analysis.
学科主题	光学工程
内容类型	学位论文
源URL	[http://ir.siom.ac.cn/handle/181231/31131]
专题	中国科学院上海光学精密机械研究所
作者单位	中国科学院上海光学精密机械研究所
推荐引用方式 GB/T 7714	王何宁. 量子点掺杂硅酸盐玻璃量子点掺杂硅酸盐玻璃量子点掺杂硅酸盐玻璃量子点掺杂硅酸盐玻璃量子点掺杂硅酸盐玻璃量子点掺杂硅酸盐玻璃制备及其制备及其制备及其光学性能研究光学性能研究光学性能研究[D].

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