论文总字数：14220字

摘 要

近年来，随着纳米科学与技术的发展，稀土掺杂的荧光纳米粒子以其独特的发光特性在光学、电子学、信息学和生物学等领域表现出潜在的应用价值。自上个世纪50 年代人们发现上转换这一现象以来，上转换发光材料研究一直是材料科学领域的研究热点之一。稀土掺杂的上转换发光纳米材料在生物标记、荧光在体成像、激光和光纤通信等领域有着广泛的应用。上转换发光材料与其他荧光材料相比，具有发射谱线窄，发光性质稳定，无光漂白现象，荧光信噪比高等优点，因此在生物医学领域有重要的潜在应用价值。

本文以稀土掺杂的上转换材料为研究对象，使用多巴胺对其进行了表面修饰，有效地提高了其亲水性、保留了较好的发光效率，同时具有较强的稳定性。

关键词：稀土掺杂；上转换；多巴胺；表面修饰

ABSTRACT

In the recent years， with the development of nanoscience and nanotechnology，fluorescent nanocrystals have attracted much attention due to their unique optical properties. There has been considerable research on upconverting phosphors since initial interest in the late 1950s. Rare-earth-doped upconverting materials have wide potential applications in many fields， including phosphors， display monitor， lasers and amplify for fiber-optic communications. Compared with other fluorescent materials， such as organic dye， the upconverting materials have several advantages in optical properties of narrow band emissions， high photostability， low background light， nonfading， and no significant influence of environment under near infrared radiation， so they can be used as biological labels materials. Rare-earth-doped upconverting nanocrystals have been reported to be used for the cell imaging， detection of nucleic acid and immunoassay. The nanocrystals should be highly efficient emission，size-controlled and monodisperse for biological applications.

In this paper， the modification of rare earth doped with rare earth is studied， and the surface modification of dopamine is used to improve the hydrophilicity， luminous efficiency and stability of the rare earth..

Key Words: Rare earth doped；Upconversion；Dopamine；Surface modification

目录

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

ABSTRACT.............................................................................................................Ⅱ

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

1.2上转换纳米发光材料的研究现状...............................................................2

1.2.1上转换纳米发光材料的合成方法........................................................... 2

1.2.2上转换纳米发光材料的修饰................................................................... . 3

1.2.3多巴胺修饰................................................................................... ..................4

1.3 本论文研究的目的及意义...........................................................................5

第二章 实验方法...............................................................................................6

2.1 上转换纳米发光材料的表面修饰.............................................................6

2.1.1 主要实验材料........................................................................................ .......6

2.1.2 主要实验仪器................................................................................... ............6

2.1.3 实验方法................................................................................................ ........7

第三章 结果与讨论...............................................................................................8

3.1 激光灯照表征...................................................................................................8

3.2　TEM表征..........................................................................................................8

3.3红外光谱分析....................................................................................................9

3.4光纤光谱测试...................................................................................................10

第四章 总结与展望..............................................................................................11

参 考 文 献............................................................................................................12

致谢............................................................................................................................14

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