【摘要】：近年來,半導(dǎo)體納米材料(量子點)得到迅速發(fā)展。由于量子點(如II-VI, III-IV, IV-VI族元素)獨特的光學(xué)性質(zhì),不同尺寸的量子點表現(xiàn)出不同的光學(xué)性質(zhì),從而引起人們極大的關(guān)注。近年來的研究指出,IV-VI量子點摻雜玻璃具有強(qiáng)的熒光輻射,例如:直徑為4~10nm的PbSe量子點摻雜玻璃在1200~2300nm具有強(qiáng)的熒光輻射。 作為新型的光纖材料,PbSe量子點摻雜硅酸鹽玻璃還未有過詳細(xì)的報道。本文的工作如下: 首先,采用高溫熔融法,首次成功制備了PbSe量子點摻雜硅酸鹽玻璃。采用X射線衍射(XRD)儀、透射電鏡(TEM)、紫外可見近紅外分光光度儀、熒光光譜儀和X射線熒光光譜(XRF)儀等,對玻璃中生成的PbSe量子點的尺寸、密度分布、吸收光譜和熒光發(fā)射譜進(jìn)行了觀測與分析。結(jié)果表明:我們制備的PbSe量子點粒度分布范圍較寬((5~13)±2nm)、體積比大約為(0.5~1)%。改變熱處理溫度和時間,可控制玻璃中生成的PbSe量子點的尺寸大小。通過引入配料ZnO,采用二步熱處理等方法,可提高玻璃中量子點生成的濃度。光譜測量表明:我們得到的PbSe量子點玻璃具有熒光輻射強(qiáng)、輻射譜較寬(245~808nm)、輻射峰位于常規(guī)及長波帶通信區(qū)域(1546~2757nm)等特點。 接著,通過較長時間(五個月)的觀測對比,觀測了量子點摻雜玻璃輻射光譜特性的時間穩(wěn)定性。結(jié)果表明:本文制備的PbSe量子點摻雜玻璃光譜特性非常穩(wěn)定,其熒光發(fā)射譜不隨時間變化。 最后,在實驗室中,采用熔融拉絲法,將PbSe量子點玻璃拉制成量子點光纖。用光學(xué)顯微鏡、TEM和光譜分析儀等,對量子點光纖的結(jié)構(gòu)、機(jī)械性能、光纖中的量子點尺寸及其發(fā)射光譜進(jìn)行了觀測與分析。結(jié)果表明:我們拉制的量子點光纖直徑均勻、表面光滑、光纖為圓截面、直徑為60~120μm,其機(jī)械性能接近于普通的石英光纖。 基于以上的研究,結(jié)論是:PbSe量子點硅酸鹽玻璃是一種新型的、具有高增益、寬帶寬、性能穩(wěn)定的光纖材料,有可能應(yīng)用于今后新一代的量子點光纖放大器中。
[Abstract]:In recent years, semiconductor nanomaterials (quantum dots) have been developed rapidly. Due to the unique optical properties of quantum dots (such as II-VI, III-IV, IV-VI family elements), quantum dots of different sizes exhibit different optical properties, which has attracted much attention. In recent years, it has been pointed out that IV-VI quantum dot-doped glass has strong fluorescence radiation, for example, PbSe quantum dot-doped glass with diameter of 4~10nm has strong fluorescence radiation in 1200~2300nm. As a new fiber material, PbSe quantum dot doped silicate glass has not been reported in detail. The work of this paper is as follows: firstly, PbSe quantum dot-doped silicate glasses were successfully prepared by high temperature melting method. The size and density distribution of PbSe quantum dots in glass were measured by X-ray diffraction (XRD), transmission electron microscope, (TEM), ultraviolet visible near infrared spectrophotometer, fluorescence spectrometer and X-ray fluorescence (XRF). Absorption spectra and fluorescence emission spectra were observed and analyzed. The results show that the particle size distribution of the PbSe quantum dots prepared by our method is relatively wide (50.13) 鹵2nm), and the volume ratio is about (0.5%)%. The size of PbSe quantum dots in glass can be controlled by changing the heat treatment temperature and time. The concentration of quantum dots in glass can be increased by introducing ZnO, into the glass and adopting two-step heat treatment. The spectral measurements show that the PbSe quantum dot glass has the characteristics of strong fluorescence radiation, wide radiation spectrum (245~808nm), and the radiation peak is located in the conventional and long wave band communication region (1546~2757nm). Then, the time stability of the spectral properties of quantum dot-doped glass is observed by comparison of a long time (five months). The results show that the spectral properties of the PbSe QDs doped glass are very stable, and the fluorescence emission spectra do not change with time. Finally, in the laboratory, the PbSe quantum dot glass was drawn to make the quantum dot fiber by the method of melt wire drawing. The structure, mechanical properties, quantum dot size and emission spectrum of quantum dot fiber were observed and analyzed by optical microscope, TEM and spectrum analyzer. The results show that the fiber is uniform in diameter and smooth in surface. The fiber has a circular section and a diameter of 60 ~ 120 渭 m. The mechanical properties of the fiber are close to those of ordinary quartz fiber. Based on the above research, it is concluded that PbSe quantum dot silicate glass is a new type of fiber material with high gain, wide bandwidth and stable performance, which may be used in the next generation quantum dot fiber amplifier.
【學(xué)位授予單位】：浙江工業(yè)大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2011
【分類號】：TN304

【引證文獻(xiàn)】

相關(guān)博士學(xué)位論文 前1條

1 許周速;紅外激光納米增益材料制備及大功率激光輸出特性研究[D];浙江工業(yè)大學(xué);2012年

，

本文編號：2393454