Exciton-Trion Transitions in Single CdSe-CdS Core-Shell Nanocrystals

被引：131

作者：

Gomez, Daniel E. ^{[1
,2
]}

van Embden, Joel ^{[1
,2
]}

Mulvaney, Paul ^{[1
,2
]}

Fernee, Mark J. ^{[3
]}

Rubinsztein-Dunlop, Halina ^{[3
]}

机构：

[1] Univ Melbourne, Sch Chem, Parkville, Vic 3010, Australia

[2] Univ Melbourne, Inst Bio21, Parkville, Vic 3010, Australia

[3] Univ Queensland, Sch Phys Sci, Ctr Quantum Comp Technol, Brisbane, Qld 4072, Australia

来源：

ACS NANO | 2009年 / 3卷 / 08期

关键词：

semiconductor nanocrystals; quantum dots; excitons; CdSe/CdS; photoluminescence; blinking; spectral diffusion; single molecule spectroscopy; trions; QUANTUM-DOT; FLUORESCENCE INTERMITTENCY; EMISSION INTERMITTENCY; BLINKING; SURFACE; INTENSITY; DEPENDENCE; CHEMISTRY; PHOTONS; STATES;

D O I：

10.1021/nn900296q

中图分类号：

O6 [化学];

学科分类号：

0703 ;

摘要：

We report on the observation of an intermediate state in the blinking of single CdSe/CdS core-shell nanocrystals. This state has a low quantum yield and connects the "on" and "off" states commonly observed in the photoluminescence blinking of Individual nanocrystals. We find that the transitions between these two emitting states follow nearly single-exponential statistics. The transitions from the "on" state to this intermediate state result from changes in the surface passivation of the nanocrystal. The data are consistent with photoinduced, adsorption/desorption events that take place at the surface of the nanocrystals. The trion state leads to a reduction in photoluminescence in nanocrystals.

引用

页码：2281 / 2287

页数：7

共 43 条

[1] Evidence for a thermal contribution to emission intermittency in single CdSe/CdS core/shell nanocrystals [J].

Banin, U ;

Bruchez, M ;

Alivisatos, AP ;

Ha, T ;

Weiss, S ;

Chemla, DS .

JOURNAL OF CHEMICAL PHYSICS, 1999, 110 (02) :1195-1201

[2] CORRELATION BETWEEN PHOTONS IN 2 COHERENT BEAMS OF LIGHT [J].

BROWN, RH ;

TWISS, RQ .

NATURE, 1956, 177 (4497) :27-29

[3] 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

[4] Emission intermittency in silicon nanocrystals [J].

Cichos, F ;

Martin, J ;

von Borczyskowski, C .

PHYSICAL REVIEW B, 2004, 70 (11) :115314-1

[5] Photo-activated luminescence of CdSe quantum dot monolayers [J].

Cordero, SR ;

Carson, PJ ;

Estabrook, RA ;

Strouse, GF ;

Buratto, SK .

JOURNAL OF PHYSICAL CHEMISTRY B, 2000, 104 (51) :12137-12142

[6] 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

[7] Influence of spectral diffusion on the line shapes of single CdSe nanocrystallite quantum dots [J].

Empedocles, SA ;

Bawendi, MG .

JOURNAL OF PHYSICAL CHEMISTRY B, 1999, 103 (11) :1826-1830

[8] Emission intensity dependence and single-exponential behavior in single colloidal quantum dot fluorescence lifetimes [J].

Fisher, BR ;

Eisler, HJ ;

Stott, NE ;

Bawendi, MG .

JOURNAL OF PHYSICAL CHEMISTRY B, 2004, 108 (01) :143-148

[9] Solution control of radiative and nonradiative lifetimes: A novel contribution to quantum dot blinking suppression [J].

Fomenko, Vasiliy ;

Nesbitt, David J. .

NANO LETTERS, 2008, 8 (01) :287-293

[10] Explanation of quantum dot blinking without the long-lived trap hypothesis [J].

Frantsuzov, PA ;

Marcus, RA .

PHYSICAL REVIEW B, 2005, 72 (15)

← 1 2 3 4 5 →