基于掺杂量子点的紫外探测设计

论文总字数：25178字

摘 要

地表紫外探测作为光学检测的重要组成部分，具有噪声小、信噪比高等突出优点，历来受到广泛关注。因为紫外光对硅层的透射深度小于2nm，所以传统的硅基光电探测器对400nm以下的光探测效率低。一直以来，高灵敏度紫外探测大多采用紫外敏感的光电倍增管和类似的真空器件，或者使用GaN等宽禁带半导体的本征型紫外光电探测器，真空器件具有体积大、工作电压大等缺点，而宽禁带半导体会出现持续光电导现象，响应速度较慢，不适合高频工作。

本文所提出的基于掺杂量子点的紫外探测系统，是量子点在紫外探测领域的重要应用。使用掺锰量子点薄膜作为荧光下转换材料提供了一种有效且低成本的方法来改善硅光电探测器的紫外响应。利用掺锰量子点薄膜荧光长寿命的特点进行紫外信号的提取，可以有效避免背景信号的影响，实现对紫外光的高效探测。此外，还可以将掺锰量子点薄膜适用于电荷耦合器件（CCD）的成像上，设计了紫外全景成像探测器，实现单通道的双频带成像检测。

实验结果表明，本文中的紫外光测量系统，利用掺锰量子点薄膜荧光长寿命的特性，实现了对紫外光的探测，具有成本低、体积小的优势。

关键词：光致发光，光电探测器，紫外光，荧光下转换，量子点

Abstract

As an important part of optical detection, surface ultraviolet detection has the outstanding advantages of low noise and high signal-to-noise ratio, and has been widely concerned. Since the transmission depth of ultraviolet light to the silicon layer is less than 2 nm, the conventional silicon-based photodetector has low light detection efficiency below 400 nm. For a long time, high-sensitivity ultraviolet detection mostly uses ultraviolet-sensitive photomultiplier tubes and similar vacuum devices, or intrinsic ultraviolet photodetectors using wide-bandgap semiconductors such as GaN. Vacuum devices have the disadvantages of large volume and large operating voltage. The wide bandgap semiconductor will exhibit continuous photoconductivity, and the response speed is slow, which is not suitable for high frequency operation.

The ultraviolet detection system based on doped quantum dots proposed in this paper is an important application of quantum dots in the field of ultraviolet detection. The use of manganese-doped quantum dot films as a fluorescent under-conversion material provides an efficient and low-cost way to improve the UV response of silicon photodetectors. Ultraviolet signal extraction using the characteristics of long-life fluorescence of manganese-doped quantum dot films can effectively avoid the influence of background signals and achieve efficient detection of ultraviolet light. In addition, the manganese-doped quantum dot film can be applied to the imaging of a charge coupled device (CCD), and an ultraviolet panoramic imaging detector is designed to realize single-channel dual-band imaging detection.

The experimental results show that the ultraviolet light measurement system in this paper realizes the detection of ultraviolet light by utilizing the characteristics of long-life fluorescence of manganese-doped quantum dot film, which has the advantages of low cost and small volume.

KEY WORDS: photoluminescence, photodetectors, ultraviolet light, fluorescence down conversion, quantum dots

目 录

摘要……..…………………………………………………………………………………………Ⅰ

Abstract……...……………………………………………………………………………………Ⅱ

目录………………………………………………………...…………...……..….……………..III

第一章 绪论……..….……………………………………………………………………………1

1.1 课题研究的目的和意义………….……..………………………………………………1

1.2 紫外光探测的研究现状…………...……………………………………………………1

1.2.1 紫外探测器的研究现状……………….…………………………………………1

1.2.2 荧光下转换材料的研究现状……………….……………………………………2

1.3本文的主要研究内容和组织结构………………………………………………………3

第二章 紫外光探测系统原理分析………...……………………………………………………5

2.1 量子点及薄膜制备……………...………………………………………………………5

2.1.1 量子点的光致发光现象………………………………………………………… 5

2.1.2 薄膜制备……………….…………………………………………………………5

2.2 硅光电二极管及电路分析………..…………………………………………………… 6

2.2.1 硅光电二极管的原理………………….…………………………………………6

2.2.2 光电二极管电路分析…………………………………………………………… 7

第三章 紫外光探测系统方案设计………...……………………………………………………9

3.1 系统方案设计………...…………………………………………………………………9

3.2 光电模块…………….…………………………………………………………………10

第四章 系统测试和数据分析……….…………………………………………………………13

4.1 系统搭建和测试…………….…………………………………………………………13

4.2 测量结果和分析……………….………………………………………………………13

4.3 实验总结…………….…………………………………………………………………17

第五章 基于CCD的紫外全景成像探测器……...……………………………………………18

5.1 紫外全景成像探测器系统设计…………….…………………………………………18

5.2 系统测试结果分析………….…………………………………………………………18

第六章 总结和展望…………….………………………………………………………………20

6.1 总结…………….………………………………………………………………………20

6.2 工作展望……………….………………………………………………………………20

致谢…………...…………………………………………………………………………………21

参考文献…………………………...……………………………………………………………22

第一章 绪论

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