Turn-off of fluorescence of styryl phenanthrimidazole on doping ZnO nanoparticles with Ce3+

• 全文链接
• 请求原文

作   者：

Jayabharathi, J.;  JebaSingh, I.;  Arunpandiyan, A.;  Karunakaran, C.; 

作者机构：

Annamalainagar 608002;  India;  Annamalai Univ;  Dept Chem;  Tamil Nadu; 

关键词：

Phenanthrimidazole;  Delta G(et);  Turn-off fluorescence;  Electron transfer;  Ce-ZnO; 

期刊名称：

Spectrochimica acta, Part A. Molecular and biomolecular spectroscopy

i s s n：

1386-1425

年卷期：

2015 年 135A 卷

页   码：

264-269

页   码：

摘   要：

ZnO nanoparticles were doped with Ce3+ by sol-gel synthesis and characterized by high-resolution scanning electron microscopy (HR-SEM), powder X-ray diffraction (XRD) and UV-visible diffuse reflectance (DRS) and photoluminescence (PL) spectroscopies. The dynamics of photoinduced electron injection from styryl phenanthrimidazole to Ce3+-doped ZnO nanoparticles has been studied by absorption, fluorescence and lifetime spectroscopic methods. Both the absorption and fluorescence quenching results suggest association between Ce3+-doped ZnO and the phenanthrimidazole. The free energy change (Delta G(et)) for electron injection has been calculated. The critical energy transfer distance between the phenanthrimidazole and Ce3+-doped ZnO nanoparticles has been deduced. In contrast to our earlier observation of enhancement of fluorescence of the phenanthrimidazole by ZnO nanoparticles, doping ZnO with Ce3+ turns off its fluorescence. These findings provide a method to test the presence of Ce3+ in ZnO nanocrystals. (C) 2014 Elsevier B.V. All rights reserved.