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1、Nanoworld: Introduction of luminescent semiconductor nanocrystals- quantum dots (QDs),2015.02.06,Yuancheng Cao, Dr. ,Name Quantum dot: semiconductor nanocrystal; colloidal nanoparticle; semiconductor nanocluster; artificial atom; onorganise nano crystal II-VI: CdSe, CdTe, CdS, ZnSeIII-V: InP, InAs F
2、luorescent property,What it is?,Relation of compenets and emission,QDs /PS Encoding,What it looks like?,HR-TEM image,QDs /PS Encoding,How big it is?,QD Probe,TEM image,小鼠腹腔巨噬细胞吞噬量子点,裸鼠注射大量剂水溶性量子点,Is it toxic?,Why fluorescent Quantum confinement effect,Quantum confinement effect: E(R)= Eg+h22 /2R2-1.
3、8/R EE(R)-Eg= h22 /2R2-1.8/R E 0, R(h22/3.6)1/3,QDs /PS Encoding,Fluo. spectra,Multi-color QDs image,Why it is so attractive?,Disadvantages of organic dyes,Texas Red,Fluorescein,Photochemical Instability,Broad excitation，narrow emission,QD and R6G,QDs emission 400nm to 2um,Emission can be adjusted b
4、y the size and components,Same excitation different emission,Surface modification,GFPand QD,Good photostability,QD标记的稳定性确保对细胞的安全性，Sanford M. Simon, Nature Biotechnology, 2003, 21, 48,Biocompatibility,Conjugated QDs keep the same fluo. ability,QDs conjugation does not affect the ligands interactions
5、. QDHeLa cell (A) and QD-transferorHeLa cell (B),图6： The effects of increasing temperature on the relative PL intensity ofdifferent sized CdTe quantum dots: (a) 3.5 nm, (b) 3.1 nm, (c) 2.8 nm, and (d)denatured ovalbumin-QDs (3.5 nm).,图5：Spectra of temperature-dependent CdTe quantum dots (3.5 nm). (a
6、)Absorption spectrum at 280 K and photoluminescence spectra (b k) at: 278 K,283 K, 288 K, 293 K, 298 K, 303 K, 308 K, 313 K, 318 K, 323 K. (ex= 400 nm).,Talanta 74 (2008) 724729,温度敏感性,红移：胶体性质聚集,FRET：能力共转移,光漂白,How to make it?,Core Nanocrystal,Inorganic Shell,Capping Group,Organic coating,Functionalit
7、y,Crosslinker and Biomolecule,（油溶性QDs）,QDs复合材料,QDs-SiO2QDs-TiO2QDs-Fe3O4QDs-Al（OH）3。,How much is it?,300: 10 molar, 0.1ml !,-8,More expensive than GOLD, Biomoleculer interaction, life science in cell,multi-color imagine, tissue photo-imagine, Cell or bead labeling,Is it useful?,QDs in biomedical fie
8、lds,量子点显示技术的应用,三星开发业界首款全彩量子点显示屏2011/2,iPhone6杀手功能曝光 量子点屏幕技术2014/2,亚马逊KindleFireHDX 7英寸版本2014/2,目前，量子点有英国、德国、美国的三家企业竞相开发技术和争夺市场。量子点材料产量排在第一位和第二位的德国Nanosys和美国QD Vision的供货量加起来，2013年内共向几百万台电视机供应了量子点材料。,索尼采用特丽魅技术的BRAVIA电视展示2013/6,QDs显示器的一般构件,QDEF可取代LCD内部扩散膜的功能，以及将蓝光转换为绿光以及红光。（图片取自Nanosys）,图4 传统的白光LED显示器光
9、谱（A）和QDs显示器光谱（B）的比较。,QDs 显示器制备,QDs LED（QLED）,QDs 发光膜,UV light,reference,Paul A. Alivisatos, Science 1998, 281,2013Shuming Nie, Science 1998, 281, 2016 Benoit Dubertret, Science, 2002, 298, 1759Maria E. kerman,PNAS,USA, 2002,19,12617Shuming Nie, Current Opinion in Biotechnology, 2002, 13, 40Xingyong
10、Wu, Nature Biotechnology, 2003,21,41 Sanford M. Simon, Nature Biotechnology, 2003, 21, 48Matthew J. Mauro, Nature Materials, 2003, 2, 630Caroline Seydel,Science, 2003, 300, 80Maxime Dahan, Science, 2003, 302, 442. Watt W. Webb, Science, 2003, 300, 1434Hongxia Xu,Nucleic Acids Research, 2003, 31,e43Kim S, Nature Biotechnology,2004, 22, 93Michael J. Levene,Journal of Neurophysiology 2004, 91,1908Michalet X, Science, 2005, 307, 538Igor L. Medintz,Nature Materials, 2005, 4, 435Chun-yang Zhang, Nature Materials, 2005, 4,826Chun-yang Zhang, J. Am. Chem. Soc. 2006, 128, 5324,Thanks！,
