Four-Fold Enhancement of the Activation Energy for Nonradiative Decay of Excitons in PbSe/CdSe Core/Shell versus PbSe Colloidal Quantum Dots

被引：54

作者：

Abel, Keith A. ^{[1
]}

Qiao, Haijun ^{[2
]}

Young, Jeff F. ^{[2
]}

van Veggel, Frank C. J. M. ^{[1
]}

机构：

[1] Univ Victoria, Dept Chem, Victoria, BC V8W 3V6, Canada

[2] Univ British Columbia, Dept Phys & Astron, Vancouver, BC V6T 1Z1, Canada

来源：

JOURNAL OF PHYSICAL CHEMISTRY LETTERS | 2010年 / 1卷 / 15期

基金：

加拿大自然科学与工程研究理事会; 加拿大创新基金会;

关键词：

NANOCRYSTALS; SPECTROSCOPY;

D O I：

10.1021/jz1007565

中图分类号：

O64 [物理化学（理论化学）、化学物理学];

学科分类号：

070304 ; 081704 ;

摘要：

PbSe/CdSe core/shell quantum dots (QDs) were prepared and investigated as thick films using temperature-dependent photoluminescence. In addition to increased photostability, the CdSe shell leads to a four-fold increase of the activation energy for nonradiative exciton decay for the core/shell QDs compared to that for the bare PbSe QDs. The onset for exponential decay of luminescence is similar to 240 K in the core/shell samples. From further analysis of the temperature-dependent photoluminescence shift and emission line width, we find that the cation exchange reaction broadens the QD size distribution and increases the temperature-independent state broadening. However, the temperature-dependent contribution to the line shape of the core/shell QDs is similar to that in the cores.

引用

页码：2334 / 2338

页数：5

共 22 条

[1] Temperature-tuning of near-infrared monodisperse quantum dot solids at 1.5 μm for controllable Forster energy transfer [J].

Bose, Ranojoy ;

McMillan, James F. ;

Gao, Jie ;

Rickey, Kelly M. ;

Chen, Chariton J. ;

Talapin, Dmitri V. ;

Murray, Christopher B. ;

Wong, Chee Wei .

NANO LETTERS, 2008, 8 (07) :2006-2011

[2] Cryogenic spectroscopy of ultra-low density colloidal lead chalcogenide quantum dots on chip-scale optical cavities towards single quantum dot near-infrared cavity QED [J].

Bose, Ranojoy ;

Gao, Jie ;

McMillan, James F. ;

Williams, Alex D. ;

Wong, Chee Wei .

OPTICS EXPRESS, 2009, 17 (25) :22474-22483

[3] (CdSe)ZnS core-shell quantum dots: Synthesis and characterization of a size series of highly luminescent nanocrystallites [J].

Dabbousi, BO ;

RodriguezViejo, J ;

Mikulec, FV ;

Heine, JR ;

Mattoussi, H ;

Ober, R ;

Jensen, KF ;

Bawendi, MG .

JOURNAL OF PHYSICAL CHEMISTRY B, 1997, 101 (46) :9463-9475

[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] Colloidal quantum dots [J].

Guyot-Sionnest, Philippe .

COMPTES RENDUS PHYSIQUE, 2008, 9 (08) :777-787

[6] Photoluminescence spectroscopy of PbSe nanocrystals [J].

Harbold, Jeffrey M. ;

Wise, Frank W. .

PHYSICAL REVIEW B, 2007, 76 (12)

[7] Temperature-Dependent Photoluminescence of CdSe-Core CdS/CdZnS/ZnS-Multishell Quantum Dots [J].

Jing, Pengtao ;

Zheng, Jinju ;

Ikezawa, Micho ;

Liu, Xueyan ;

Lv, Shaozhe ;

Kong, Xianggui ;

Zhao, Jialong ;

Masumoto, Yasuaki .

JOURNAL OF PHYSICAL CHEMISTRY C, 2009, 113 (31) :13545-13550

[8] PbTelCdTe CorelShell Particles by Cation Exchange, a HR-TEM study [J].

Lambert, Karel ;

De Geyter, Bram ;

Moreels, Iwan ;

Hens, Zeger .

CHEMISTRY OF MATERIALS, 2009, 21 (05) :778-+

[9] Structural and optical characterizations of multi-layered and multi-stacked PbSe quantum dots [J].

Lee, MH ;

Chung, WJ ;

Park, SK ;

Kim, MS ;

Seo, HS ;

Ju, JJ .

NANOTECHNOLOGY, 2005, 16 (08) :1148-1152

[10] Temperature dependence of electronic energy transfer in PbS quantum dot films [J].

Lue, Wei ;

Kamiya, Itaru ;

Ichida, Masao ;

Ando, Hiroaki .

APPLIED PHYSICS LETTERS, 2009, 95 (08)

← 1 2 3 →