论文总字数：21967字

摘 要

碳量子点（CDs）以其光稳定性、低毒、良好生物相容性，以及独特的荧光特性而受到广泛的关注。本文先通过乳液聚合法制备环氧基团富集的聚苯乙烯-co-聚甲基丙烯酸缩水甘油酯(PS-co-PGMA)单分散光子晶体前驱体，然后通过高温热解法简便快速的制备了荧光可调的碳量子点。考察了不同热解温度制备的碳量子点的荧光性质（波长，寿命，量子产率等）。通过透射电镜、红外等表征手段证明了环氧基团在不同温度下热解程度不同导致了碳量子点的荧光可调。荧光可调碳量子点在光电领域表现出极大地潜在应用,因此我们利用所制备的碳量子点固体直接作为LED荧光粉，制备了光学性能良好的白光LED。这为多功能荧光碳量子点的众多应用，例如：传感器，生物标记等又创造了一个广泛的应用前景。

关键词：碳量子点 荧光可调 光子晶体 LED

Tunable Fluorescence Carbon Dots Synthesized By Monodisperse Photonic Crystals

Abstract

Carbon dots (CDs) with photostability, low toxicity, excellent biocompatibility and special have received widespread attention. In this work, we report the synthesis of multicolor fluorescent carbon quantum dots from chemical unzipping of epoxy-enriched poly(styrene-co-glycidylmethacrylate) (PS-co-PGMA) photonic crystals via a simple one-step pyrolysis procedure. The fluorescence properties (wavelength, lifetime, quantum yield) of as-prepared CDs under different temperature was investigated. According to the analysis of TEM, FTIR characterization we confirmed that the tunable fluorescence of CDs origin from pyrolysis of epoxy groups in different extent under different temperature. Tunable fluorescence CDs show great potential application on electro-optic field. Herein we take this as-prepared solid CDs as phosphor directly and successfully prepared white LED with good optical properties which created a new outlook for the application of CDs regardless of the already exist applications like sensor, biomarker.

Key Words: Carbon dots; Tunable fluorescence; photonic crystals; LED

目 录

摘要...............................................................................................................................................I

Abstract.......................................................................................................................................Ⅱ

第一章 文献综述.....................................................................................................................1

1.1 引言.................................................................................................................................1

1.2 荧光碳量子点的特性......................................................................................................1

1.3 碳量子点的研究进展......................................................................................................1

1.3.1 碳量子点制备方法...............................................................................................1

1.3.2 碳量子点的应用...................................................................................................5

1.4 碳量子点研究领域存在的问题..................................................................................7

第二章 实验部分....................................................................................................................9

2.1 实验原料........................................................................................................................9

2.2 主要仪器与设备.............................................................................................................9

2.3 PS-co-PGMA光子晶体的制备......................................................................................9

2.4 荧光碳量子点的制备....................................................................................................10

2.5 LEDs的制备...................................................................................................................10

2.6 量子产率计算................................................................................................................10

2.7 表征手段........................................................................................................................11

第三章 结果与讨论................................................................................................................12

3.1 PS-co-PGMA光子晶体的性能测试..............................................................................12

3.2 荧光碳量子点的形成机理............................................................................................12

3.3 荧光碳量子点的形貌分析............................................................................................13

3.4 荧光碳量子点的结构分析............................................................................................14

3.4.1 荧光碳量子点的FT-IR分析.............................................................................14

3.4.2 荧光碳量子点的Raman分析............................................................................15

3.5 荧光碳量子点的光学性能............................................................................................16

3.5.1 荧光碳量子点的紫外及荧光分析.....................................................................16

3.5.2 荧光碳量子点的量子产率与荧光寿命.............................................................17

3.6 荧光碳量子点在LED器件方面的应用.......................................................................18

第四章 结论..............................................................................................................................20

参考文献.....................................................................................................................................21

致谢..............................................................................................................................................24

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