Title: Hydrothermal Synthesis and Size-Enhanced Chromaticity of Sr<sub>2</sub>ZnSi<sub>2</sub>O<sub>7</sub>:Eu<sup>3+</sup> Nanoparticles
Abstract: Red phosphor Sr 2 ZnSi 2 O 7 :Eu 3+ nanoparticles with an average diameter of 20 nm were successfully synthesized via a low-temperature hydrothermal route in order to understand the underlying relationship between size and luminescent properties. The nanometer-sized particles result in a distinct improvement in chromaticity and a high quenching concentration. According to emission spectra, the relative intensity of the 5 D 0 → 7 F 2 to 5 D 0 → 7 F 1 transitions in nanometer-sized phosphors is higher than that of the corresponding bulk material. The better chromaticity results from the more distorted lattices and relatively lower crystal symmetry around the Eu 3+ ions, which is ascribed to the large surface area due to the nanometer size of the phosphor. Moreover, the nanometer-sized Sr 2 ZnSi 2 O 7 :Eu 3+ red phosphor exhibits a shorter fluorescent lifetime and a blue-shift in excitation spectra compared to that of its bulk counterpart. These results indicate that size-induced enhancement of luminescent properties is an efficient way to obtain red phosphors with better chromaticity.
Publication Year: 2008
Publication Date: 2008-03-01
Language: en
Type: article
Indexed In: ['crossref']
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Cited By Count: 8
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