Interstitial sulfur photoluminescence in thermochemically synthesized CdS nanocrystals (NCs)

被引：7

作者：

Molaei, M. ^{[1
]}

Iranizad, E. Saievar ^{[1
]}

Marandi, M. ^{[2
]}

Taghavinia, N. ^{[3
]}

机构：

[1] Tarbiat Modares Univ, Dept Phys, Tehran, Iran

[2] Arak Univ, Dept Phys, Arak, Iran

[3] Sharif Univ Technol, Dept Phys, Tehran, Iran

来源：

EUROPEAN PHYSICAL JOURNAL-APPLIED PHYSICS | 2011年 / 56卷 / 01期

关键词：

WHITE-LIGHT EMISSION; SEMICONDUCTOR NANOCRYSTALS; ELECTROLUMINESCENCE; LUMINESCENCE; CLUSTERS; BRIGHT; FLUORESCENCE; POLYMER; SIZE;

D O I：

10.1051/epjap/2011100518

中图分类号：

O59 [应用物理学];

学科分类号：

摘要：

We have synthesized CdS NCs (NCs) by a thermochemical approach. CdSO4 and Na2S2O3 were used as the precursors and thioglycolic acid (TGA) was used as capping agent molecule. The structure and optical property of the NCs were characterized by means of XRD, TEM, UV-visible optical spectroscopy and photoluminescence (PL). XRD and TEM analyses demonstrated hexagonal phase CdS NCs with an average size of around 2 nm. Synthesized NCs exhibited a band gap of about 3.21 eV and showed a broad band emission from 400 to 750 nm centered at 503 nm. This broad band emission is related to surface states of CdS and our results showed that the emission peak can be attributed to the interstitial sulfur. The best attained photoluminescence quantum yield of the NCs was about 11%. At the same conditions the PL quantum yield of TGA capped NCs was about 20 times higher than that of TG capped NCs.

引用

页数：5

共 36 条

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