On the Interpretation of Colloidal Quantum-Dot Absorption Spectra

被引：24

作者：

Moreels, Iwan ^{[1
]}

Hens, Zeger ^{[1
]}

机构：

[1] Univ Ghent, B-9000 Ghent, Belgium

来源：

SMALL | 2008年 / 4卷 / 11期

关键词：

D O I：

10.1002/smll.200800068

中图分类号：

O6 [化学];

学科分类号：

0703 ;

摘要：

Colloidal QPbSe dispersions were studied to discuss two issues in the interpretation of absorption spectra of colloidal quantum dots using the absorption coefficient of small particles. Small aliquots were dried after synthesis under a strong nitrogen flow and dispersed in 1 ml of CCl4 to measure the absorption spectrum. Equal amounts were dissolved in 100ml of HNO3 to determine the nanocrystal concentration with inductively coupled plasma mass spectrometry. It was found that the strong increase of the absorbance at low wavelengths is not due to Rayleigh scattering. The result reflects a strong increase in the local field factor at these energies. A shift of the absorbance peaks with size is a clear sign of quantum confinement, and comparison between experimental data and theoretical calculations.

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收藏

页码：1866 / 1868

页数：3

相关论文

共 14 条

[1] Confinement effects in PbSe quantum wells and nanocrystals [J].

Allan, G ;

Delerue, C .

PHYSICAL REVIEW B, 2004, 70 (24) :1-9

[2] The peculiar electronic structure of PbSe quantum dots [J].

An, J. M. ;

Franceschetti, A. ;

Dudiy, S. V. ;

Zunger, Alex .

NANO LETTERS, 2006, 6 (12) :2728-2735

[3] Size-dependent extinction coefficients of PbS quantum dots [J].

Cademartiri, Ludovico ;

Montanari, Erica ;

Calestani, Gianluca ;

Migliori, Andrea ;

Guagliardi, Antonietta ;

Ozin, Geoffrey A. .

JOURNAL OF THE AMERICAN CHEMICAL SOCIETY, 2006, 128 (31) :10337-10346

[4] Optical properties of colloidal PbSe nanocrystals [J].

Du, H ;

Chen, CL ;

Krishnan, R ;

Krauss, TD ;

Harbold, JM ;

Wise, FW ;

Thomas, MG ;

Silcox, J .

NANO LETTERS, 2002, 2 (11) :1321-1324

[5] ABSORPTION AND INTENSITY-DEPENDENT PHOTOLUMINESCENCE MEASUREMENTS ON CDSE QUANTUM DOTS - ASSIGNMENT OF THE 1ST ELECTRONIC-TRANSITIONS [J].

EKIMOV, AI ;

HACHE, F ;

SCHANNEKLEIN, MC ;

RICARD, D ;

FLYTZANIS, C ;

KUDRYAVTSEV, IA ;

YAZEVA, TV ;

RODINA, AV ;

EFROS, AL .

JOURNAL OF THE OPTICAL SOCIETY OF AMERICA B-OPTICAL PHYSICS, 1993, 10 (01) :100-107

[6] Highly efficient multiple exciton generation in colloidal PbSe and PbS quantum dots [J].

Ellingson, RJ ;

Beard, MC ;

Johnson, JC ;

Yu, PR ;

Micic, OI ;

Nozik, AJ ;

Shabaev, A ;

Efros, AL .

NANO LETTERS, 2005, 5 (05) :865-871

[7] Optical investigation of quantum confinement in PbSe nanocrystals at different points in the Brillouin zone [J].

Koole, Rolf ;

Allan, Guy ;

Delerue, Christophe ;

Meijerink, Andries ;

Vanmaekelbergh, Daniel ;

Houtepen, Arjan J. .

SMALL, 2008, 4 (01) :127-133

[8] On the absorption cross section of CdSe nanocrystal quantum dots [J].

Leatherdale, CA ;

Woo, WK ;

Mikulec, FV ;

Bawendi, MG .

JOURNAL OF PHYSICAL CHEMISTRY B, 2002, 106 (31) :7619-7622

[9] Composition and size-dependent extinction coefficient of colloidal PbSe quantum dots [J].

Moreels, Iwan ;

Lambert, Karel ;

De Muynck, David ;

Vanhaecke, Frank ;

Poelman, Dirk ;

Martins, Jose C. ;

Allan, Guy ;

Hens, Zeger .

CHEMISTRY OF MATERIALS, 2007, 19 (25) :6101-6106

[10] Colloidal synthesis of nanocrystals and nanocrystal superlattices [J].

Murray, CB ;

Sun, SH ;

Gaschler, W ;

Doyle, H ;

Betley, TA ;

Kagan, CR .

IBM JOURNAL OF RESEARCH AND DEVELOPMENT, 2001, 45 (01) :47-56