Colloidal ZnSe, ZnSe/ZnS, and ZnSe/ZnSeS quantum dots synthesized from ZnO

被引：129

作者：

Chen, HS ^{[1
]}

Lo, B ^{[1
]}

Hwang, JY ^{[1
]}

Chang, GY ^{[1
]}

Chen, CM ^{[1
]}

Tasi, SJ ^{[1
]}

Wang, SJJ ^{[1
]}

机构：

[1] Ind Technol Res Inst, Union Chem Labs, Hsinchu 300, Taiwan

来源：

JOURNAL OF PHYSICAL CHEMISTRY B | 2004年 / 108卷 / 44期

关键词：

D O I：

10.1021/jp047035w

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：

Colloidal ZnSe quantum dots were successfully synthesized from ZnO in a lauric acid/hexadecylamine mixture. X-ray diffraction patterns indicated that the ZnSe quantum dots possess a wurtzite structure. Transmission electron microscope images of the quantum dots showed that the average diameter are in the range of 25similar to60 Angstrom. The size-dependent photoluminescence was controlled from 400 to 440 run with the quantum yields of 6similar to10% at room temperature. After passivation with 1.8 monolayer of ZnS overcoat by a traditional two-step method, the quantum yields of ZnSe/ZnS QDs are increased similar to4.5-fold (quantum yield similar to32%). An in-situ method of overcoating was done by directly injecting TOPS into the flask containing ZnSe, ZnO/lauric acid/ hexadecylamine, and TOPSe. The photoluminescence quantum yields were improved similar to3.8-fold after introduction of 1.6 monolayer ZnSeS overcoat to the ZnSe QDs.

引用

页码：17119 / 17123

页数：5

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