本文選題：PbSe量子點(diǎn) + PL光譜��； 參考：《浙江工業(yè)大學(xué)》2015年碩士論文

【摘要】：近年來,半導(dǎo)體納米晶體量子點(diǎn)的研究迅速發(fā)展,通過制備不同尺寸和類型的量子點(diǎn),可以得到不同波長和帶寬的吸收和發(fā)射譜。研究表明,IV-VI族的中的PbSe量子點(diǎn)的吸收-發(fā)射譜覆蓋了極寬波帶,包括近紅外通信的1550nm波段。由于具有波長可調(diào)節(jié)的特性,PbSe量子點(diǎn)在紅外光纖通信器件和激光器件的應(yīng)用成為了新的研究熱點(diǎn)。對于量子點(diǎn)光纖的研究仍有相當(dāng)多的空白。本文工作如下:(1)利用正己烷、PbSe量子點(diǎn)和紫外固化膠(UV膠)的沸點(diǎn)差異,采用旋轉(zhuǎn)蒸發(fā)法,制備了UV膠/PbSe量子點(diǎn)膠體,并稀釋得到不同濃度的量子點(diǎn)膠體。通過透射電鏡(TEM)、分光光度儀和熒光光譜儀等儀器對PbSe量子點(diǎn)膠體進(jìn)行了測量和分析。(2)利用壓力差,將不同濃度的量子點(diǎn)膠體灌裝于孔徑為130?m的空芯光纖內(nèi),并采用紫外固化燈對其固化。進(jìn)而通過對量子點(diǎn)摻雜光纖(QDF)接口封裝、端面拋光等處理后,制備出量子點(diǎn)分布均勻、不同長度和不同濃度的固態(tài)纖芯QDF。(3)采用光功率計(jì)和近紅外光譜儀分別測量了980nm的泵浦光強(qiáng)度和光致熒光光譜(PL)強(qiáng)度,分析了泵浦光強(qiáng)和熒光光強(qiáng)與QDF的摻雜濃度和光纖長度的關(guān)系。結(jié)果表明:直徑d=4.4 nm的PbSe QDF,在980 nm波長光的激勵(lì)下,其吸收系數(shù)與摻雜濃度呈線性關(guān)系,量子點(diǎn)在UV膠中的吸收截面隨濃度近似成e指數(shù)減小;PL峰值強(qiáng)度隨摻雜濃度和光纖長度變化,找到了最大峰值強(qiáng)度以及對應(yīng)的摻雜濃度和光纖長度,在濃度為0.4mg.mL-1、QDF長度7 cm時(shí)產(chǎn)生了最大光強(qiáng)。通過本文研究表明,制備以UV膠為本底的PbSe QDF,是研發(fā)QDF器件的有效途徑。
[Abstract]:In recent years, the research of semiconductor nanocrystal quantum dots to the rapid development of preparation of quantum dots of different sizes and types through the system, we can get different wavelength and bandwidth of absorption and emission spectra. The results show that PbSe IV-VI QDs in the absorption and emission spectrum of coverage zone is very wide, including a 1550nm band near infrared communication. Due to the nature of a wavelength adjustable, PbSe quantum dots has become a new hotspot in the application of infrared optical communication devices and laser devices. There are still quite a lot of vacancy for the study of quantum dots fiber. The main works are as follows: (1) using hexane, PbSe QDs and UV (ultraviolet curable adhesive) the boiling point difference, rotary evaporation, UV colloidal /PbSe quantum dots were prepared and diluted by different concentrations of colloidal quantum dots. By transmission electron microscopy (TEM), dispensing spectrophotometer and fluorescence spectrometer instrument of quantum PbSe The body was measured and analyzed. (2) using the pressure difference, the quantum dots of different concentrations of colloidal filling in the pore size of 130? M hollow fiber, and the UV curing light on the curing. And then based on quantum dot doped fiber (QDF) interface package, surface polishing processing, system preparation of quantum dot distribution, different length and different concentrations of solid core QDF. (3) and near infrared spectrometer were used to measure the intensity of pump light 980nm and photoluminescence spectra of the optical power (PL) strength, analyzes the relationship between the doping concentration and the fiber length and pump intensity and the fluorescence intensity of QDF. The results show that the diameter of d=4.4 nm PbSe QDF, at 980 nm under the excitation wavelength, the absorption coefficient is linear with the concentration of quantum dots in the UV absorption cross section with the concentration of approximately e index decreased; PL peak intensity with the doping concentration and the fiber length were found. The maximum peak intensity and the corresponding doping concentration and the fiber length, the concentration is 0.4mg.mL-1, the length of QDF produced a maximum intensity at 7 cm. This study shows that, in the preparation of UV base of PbSe QDF, is an effective way to develop QDF devices.

【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】：2015
【分類號】：TN253

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本文編號：1763884