Up-conversion luminescence of CdTe and CdTe/CdS quantum dots excited by femtosecond laser of low intensity

被引：3

作者：

An Li-Min ^{[1
,2
]}

Yang Yan-Qiang ^{[1
]}

Song Wei-Si ^{[1
]}

Su Wen-Hui ^{[1
]}

Zeng Qing-Hui ^{[3
]}

Chao Ke-Fu ^{[3
]}

Kong Xiang-Gui ^{[3
]}

机构：

[1] Harbin Inst Technol, Ctr Condensed Matter Sci & Technol, Harbin 150001, Peoples R China

[2] Heilongjiang Univ, Phys Dept Sci & Technol, Harbin 150080, Peoples R China

[3] Chinese Acad Sci, Changchun Inst Opt Fine Mech & Phys, Key Lab Excited State Proc, Changchun 130033, Peoples R China

来源：

ACTA PHYSICA SINICA | 2009年 / 58卷 / 11期

基金：

中国国家自然科学基金;

关键词：

CdTe quantum dots(QDs); CdTe/CdS core/shell QDs; time-resolved luminescence; up-conversion luminescence; RECOMBINATION DYNAMICS; NANOCRYSTALS; CDSE;

D O I：

10.7498/aps.58.7914

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

We studied the steady-state and time-resolved luminescence properties of CdTe and CdTe/CdS core/shell quantum dots by one-and two-photon excitation with a femtosecond laser of low intensity. The 800 nm excitation causes a blue shift of the emission peak compared with 400 nm laser excitation. Near-quadratic laser power dependence of the up-conversion intensity and biexponential decay kinetics are observed. It is found that upconversion luminescence is composed of a photoinduced trapping and a band edge excitonic state. The blue shift of the emission peak is caused by the relative change in luminescence intensity between excitonic and trapping states. Two-step two-photon absorption involving the surface as intermediate states has been proposed for the mechanism of up-conversion luminescence of CdTe/CdS quantum dots.

引用

页码：7914 / 7920

页数：7

共 19 条

[1] Luminescence enhancement of ZnS:Mn nanoclusters in zeolite [J].

Chen, W ;

Sammynaiken, R ;

Huang, YN .

JOURNAL OF APPLIED PHYSICS, 2000, 88 (09) :5188-5193

[2] Upconversion luminescence from CdSe nanoparticles [J].

Chen, W ;

Joly, AG ;

McCready, DE .

JOURNAL OF CHEMICAL PHYSICS, 2005, 122 (22)

[3] Up-conversion luminescence of Mn2+ in ZnS:Mn2+ nanoparticles -: art. no. 041202 [J].

Chen, W ;

Joly, AG ;

Zhang, JZ .

PHYSICAL REVIEW B, 2001, 64 (04)

[4] (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

[5]

DEMASA JN, 1971, PHYS CHEM, V25, P91

[6] Strongly photoluminescent CdTe nanocrystals by proper surface modification [J].

Gao, MY ;

Kirstein, S ;

Möhwald, H ;

Rogach, AL ;

Kornowski, A ;

Eychmüller, A ;

Weller, H .

JOURNAL OF PHYSICAL CHEMISTRY B, 1998, 102 (43) :8360-8363

[7] Nanosecond exciton recombination dynamics in colloidal CdSe quantum dots under ambient conditions [J].

Javier, A ;

Magana, D ;

Jennings, T ;

Strouse, GF .

APPLIED PHYSICS LETTERS, 2003, 83 (07) :1423-1425

[8] Upconversion luminescence of CdTe nanoparticles [J].

Joly, AG ;

Chen, W ;

McCready, DE ;

Malm, JO ;

Bovin, JO .

PHYSICAL REVIEW B, 2005, 71 (16)

[9]

Künzner N, 2001, PHYS STATUS SOLIDI B, V224, P21, DOI 10.1002/1521-3951(200103)224:1<21::AID-PSSB21>3.0.CO

[10]

2-W

← 1 2 →