Site-specific luminescence of Eu3+ in gel-combustion-derived strontium zirconate perovskite nanophosphors

被引:64
作者
Gupta, S. K. [1 ]
Mohapatra, M. [1 ]
Natarajan, V. [1 ]
Godbole, S. V. [1 ]
机构
[1] Bhabha Atom Res Ctr, Div Radiochem, Bombay 400085, Maharashtra, India
关键词
PHOTOLUMINESCENCE PROPERTIES; INTENSITIES; PHOSPHORS; SR;
D O I
10.1007/s10853-011-6195-z
中图分类号
T [工业技术];
学科分类号
08 ;
摘要
SrZrO3:Eu3+ nanoparticles with a size of about 100 nm were synthesized by a simple gel combustion route and characterized by X-ray diffraction, scanning electron microscopy, dynamic light scattering, and photoluminescence techniques. Based on the time-resolved emission data, it was inferred that three different types of Eu3+ ions were present in the matrix. The first type was a long-lived species (similar to tau = 6.0 ms) present at symmetric "Sr2+" sites, observed for excitations at 229 and 393 nm. The second was a short-lived species (tau = 1.0 ms) observed for excitations at 229, 296, and 393 nm, while for 296-nm excitation, a long-lived species (tau = 4.0 ms) was also observed. This suggested that Eu3+ ions can be present at relatively lower symmetric "Zr4+" sites with two different environments, which differ in the presence of charge-compensating defects. The color coordinates of the system were evaluated and plotted on a CIE index diagram.
引用
收藏
页码:3504 / 3515
页数:12
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