Ce3+-Sensitized GdPO4:Tb3+ Nanorods: An Investigation on Energy Transfer, Luminescence Switching, and Quantum Yield

被引：61

作者：

Sahu, Niroj Kumar ^{[1
]}

Singh, N. Shanta ^{[1
]}

Ningthoujam, R. S. ^{[2
]}

Bahadur, D. ^{[1
]}

机构：

[1] Indian Inst Technol, Dept Met Engn & Mat Sci, Bombay 400076, Maharashtra, India

[2] Bhabha Atom Res Ctr, Div Chem, Bombay 400085, Maharashtra, India

来源：

ACS PHOTONICS | 2014年 / 1卷 / 04期

关键词：

photoluminescence; energy transfer; redispersion; polymer film; magnetic behavior; optical switching; CONTRAST AGENTS; NANOPARTICLES; EU3+; EMISSION; LN(3+); CE3+; SIZE; MULTICOLOR; NANOWIRES; GDVO4;

D O I：

10.1021/ph4001718

中图分类号：

TB3 [工程材料学];

学科分类号：

0805 ; 080502 ;

摘要：

Herein we report the enhanced green emission from Tb3+-doped GdPO4 nanorods sensitized with Ce3+. The increase in the rate of nonradiative transition processes in sensitizer due to efficient energy transfer to activator is realized from steady-state and dynamic luminescence studies. Luminescence quenching due to cross relaxation is least significant up to 20 at. % Ce3+ and 7 at. % Tb3+ concentration. The quantum yield of the sample with maximum luminescence, i.e., GdPO4:Tb3+ (5 at. %)/Ce3+ (7 at. %), is found to be 28%. Also, samples are readily redispersible in water and could be easily incorporated in polymer-based films that show strong green light emission under UV excitation. The luminescence switching (ON and OFF) behavior is examined using alternately an oxidizing agent (KMnO4) and then a reducing agent (ascorbic acid) through a redox reaction (Ce3+/Ce4+). Both GdPO4:Tb3+ and GdPO4:Tb3+/Ce3+ are observed to be paramagnetic.

引用

页码：337 / 346

页数：10

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