Single-Dot Spectroscopy of Zinc-Blende CdSe/CdS Core/Shell Nanocrystals: Nonblinking and Correlation with Ensemble Measurements

被引：148

作者：

Qin, Haiyan ^{[1
,2
]}

Niu, Yuan ^{[1
,2
]}

Meng, Renyang ^{[1
,2
]}

Lin, Xing ^{[3
]}

Lai, Runchen ^{[1
,2
]}

Fang, Wei ^{[3
]}

Peng, Xiaogang ^{[1
,2
]}

机构：

[1] Zhejiang Univ, Ctr Chem Novel & High Performance Mat, Hangzhou 310027, Peoples R China

[2] Zhejiang Univ, Dept Chem, Hangzhou 310027, Peoples R China

[3] Zhejiang Univ, State Key Lab Modern Opt Instrumentat, Dept Opt Engn, Hangzhou 310027, Peoples R China

来源：

JOURNAL OF THE AMERICAN CHEMICAL SOCIETY | 2014年 / 136卷 / 01期

基金：

中国国家自然科学基金; 中国博士后科学基金;

关键词：

QUANTUM-DOT; FLUORESCENCE INTERMITTENCY; BLINKING; INTENSITY; DYNAMICS; EXCITON;

D O I：

10.1021/ja4078528

中图分类号：

O6 [化学];

学科分类号：

0703 ;

摘要：

Here we report the first series of phase-pure zinc-blende CdSe/CdS core/shell quantum dots (QDs) with reproducibly controlled shell thickness (4-16 monolayers), which are nonblinking (>= 95% 'on' time) in single-exciton regime for the entire series. These unique QDs possess well-controlled yet simple excited-state decay dynamics at both single-dot and ensemble levels, extremely small nonblinking volume threshold, if any, and unique 'on' and 'off' probability statistics. The outstanding optical properties of the QDs at the single-dot level were found to be correlated well with their ensemble properties. These small and bright nonblinking QDs offer promising technical application prospect in both single-dot and ensemble levels. The consistent and reproducible experimental results shed new light on the mechanisms of blinking of QDs.

引用

页码：179 / 187

页数：9

共 39 条

[1] Multiexcitons confined within a subexcitonic volume: Spectroscopic and dynamical signatures of neutral and charged biexcitons in ultrasmall semiconductor nanocrystals [J].

Achermann, M ;

Hollingsworth, JA ;

Klimov, VI .

PHYSICAL REVIEW B, 2003, 68 (24)

[2] Semiconductor clusters, nanocrystals, and quantum dots [J].

Alivisatos, AP .

SCIENCE, 1996, 271 (5251) :933-937

[3] Nano-engineered electron-hole exchange interaction controls exciton dynamics in core-shell semiconductor nanocrystals [J].

Brovelli, S. ;

Schaller, R. D. ;

Crooker, S. A. ;

Garcia-Santamaria, F. ;

Chen, Y. ;

Viswanatha, R. ;

Hollingsworth, J. A. ;

Htoon, H. ;

Klimov, V. I. .

NATURE COMMUNICATIONS, 2011, 2

[4]

Chen O, 2013, NAT MATER, V12, P445, DOI [10.1038/NMAT3539, 10.1038/nmat3539]

[5] Giant multishell CdSe nanocrystal quantum dots with suppressed blinking [J].

Chen, Yongfen ;

Vela, Javier ;

Htoon, Han ;

Casson, Joanna L. ;

Werder, Donald J. ;

Bussian, David A. ;

Klimov, Victor I. ;

Hollingsworth, Jennifer A. .

JOURNAL OF THE AMERICAN CHEMICAL SOCIETY, 2008, 130 (15) :5026-5027

[6] Relationship between single quantum-dot intermittency and fluorescence intensity decays from collections of dots [J].

Chung, IH ;

Bawendi, MG .

PHYSICAL REVIEW B, 2004, 70 (16) :1-5

[7]

COLVIN VL, 1994, NATURE, V370, P354, DOI 10.1038/370354a0

[8] Diffusion dynamics of glycine receptors revealed by single-quantum dot tracking [J].

Dahan, M ;

Lévi, S ;

Luccardini, C ;

Rostaing, P ;

Riveau, B ;

Triller, A .

SCIENCE, 2003, 302 (5644) :442-445

[9] Random telegraph signal in the photoluminescence intensity of a single quantum dot [J].

Efros, AL ;

Rosen, M .

PHYSICAL REVIEW LETTERS, 1997, 78 (06) :1110-1113

[10] Band-edge exciton in quantum dots of semiconductors with a degenerate valence band: Dark and bright exciton states [J].

Efros, AL ;

Rosen, M ;

Kuno, M ;

Nirmal, M ;

Norris, DJ ;

Bawendi, M .

PHYSICAL REVIEW B, 1996, 54 (07) :4843-4856

← 1 2 3 4 →