Laser-induced photoprocesses in solutions and films of the CdSe/ZnS nanoparticles

被引：7

作者：

Chistyakov, A. A. ^{[1
]}

Martynov, I. L. ^{[1
]}

Mochalov, K. E. ^{[2
]}

Oleinikov, V. A. ^{[2
]}

Zaharchenko, K. V. ^{[1
]}

机构：

[1] State Univ, Moscow Engn Phys Inst, Moscow 115409, Russia

[2] Russian Acad Sci, Shemyakin Ovchinnikov Inst Bioorgan Chem, Moscow 119871, Russia

来源：

LASER PHYSICS | 2008年 / 18卷 / 08期

关键词：

D O I：

10.1134/S1054660X0808001X

中图分类号：

O43 [光学];

学科分类号：

070207 ; 0803 ;

摘要：

The photophysical properties of solutions and films with relatively high concentrations of CdSe/ZnS nanoparticles are studied in the presence of the visible laser irradiation in a wide range of power densities. The short-wavelength wing detected in the photoluminescence spectra of the solutions of quantum dots is due to the selective laser excitation of small-size nanoparticles. A comprehensive analysis of the anti-Stokes photoluminescence of the nanoparticles in solutions and films indicates the thermal mechanism of this phenomenon. The dimensional quantization effect, narrow spectra, and a relatively high luminescence yield are retained in the films with a high nanoparticle concentration. The luminescence spectra of the films remain unchanged when the laser flux density increases to 1 x 10(6) W/cm(2). The effect of the laser radiation on the nanoparticle films is studied at the flux densities exceeding the damage threshold (5 x 10(6)-1 x 10(9) W/cm(2)).

引用

页码：925 / 938

页数：14

共 48 条

[11] THE DEVELOPMENT AND USE OF QUANTUM-MECHANICAL MOLECULAR-MODELS .76. AM1 - A NEW GENERAL-PURPOSE QUANTUM-MECHANICAL MOLECULAR-MODEL [J].

DEWAR, MJS ;

ZOEBISCH, EG ;

HEALY, EF ;

STEWART, JJP .

JOURNAL OF THE AMERICAN CHEMICAL SOCIETY, 1985, 107 (13) :3902-3909

[12] Semiconductor nanocrystal assemblies:: Experimental pitfalls and a simple model of particle-particle interaction [J].

Döllefeld, H ;

Weller, H ;

Eychmuller, A .

JOURNAL OF PHYSICAL CHEMISTRY B, 2002, 106 (22) :5604-5608

[13] Fluorescence quantum yield of CdSe/ZnS nanocrystals investigated by correlated atomic-force and single-particle fluorescence microscopy [J].

Ebenstein, Y ;

Mokari, T ;

Banin, U .

APPLIED PHYSICS LETTERS, 2002, 80 (21) :4033-4035

[14] 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

[15] Characterization and 2D self-assembly of CdSe quantum dots at the air-water interface [J].

Gattás-Asfura, KM ;

Constantine, CA ;

Lynn, MJ ;

Thimann, DA ;

Ji, XJ ;

Leblanc, RM .

JOURNAL OF THE AMERICAN CHEMICAL SOCIETY, 2005, 127 (42) :14640-14646

[16] Synthesis and properties of biocompatible water-soluble silica-coated CdSe/ZnS semiconductor quantum dots [J].

Gerion, D ;

Pinaud, F ;

Williams, SC ;

Parak, WJ ;

Zanchet, D ;

Weiss, S ;

Alivisatos, AP .

JOURNAL OF PHYSICAL CHEMISTRY B, 2001, 105 (37) :8861-8871

[17] DNA nanowire fabrication [J].

Gu, Q ;

Cheng, CD ;

Gonela, R ;

Suryanarayanan, S ;

Anabathula, S ;

Dai, K ;

Haynie, DT .

NANOTECHNOLOGY, 2006, 17 (01) :R14-R25

[18] Synthesis and characterization of strongly luminescing ZnS-Capped CdSe nanocrystals [J].

Hines, MA ;

Guyot-Sionnest, P .

JOURNAL OF PHYSICAL CHEMISTRY, 1996, 100 (02) :468-471

[19] Structure of excited-state transitions of individual semiconductor nanocrystals probed by photoluminescence excitation spectroscopy [J].

Htoon, H ;

Cox, PJ ;

Klimov, VI .

PHYSICAL REVIEW LETTERS, 2004, 93 (18) :187402-1

[20]

*HYP INC, 2003, HYPERCHEM, P13905

← 1 2 3 4 5 →