Abstract
Sr4Si3O8Cl4:Eu2+blue-green phosphors were synthesized by the gel-combustion method. The as-synthesized phosphors were analyzed and characterized by X-ray diffraction and fluorescence spectrophotometer. The results indicate that orthorhombic phaseSr4Si3O8Cl4:Eu2+has been formed after the precursor calcined at 900°C reductive temperature. The excitation spectrum ofSr4Si3O8Cl4:Eu2+is a broad band in the range of 250 ~ 450 nm and the main peak at 324 nm. The emission spectrum is also a broad band with the main emission peak at about 484 nm, which is ascribed to the typical 4f5d1to 4f7transition ofEu2+. Moreover, the effects of the concentration ofEu2+, the reductive temperature, and the doping amount ofMg2+on luminescent properties were discussed.
Highlights
White light emitting diodes (LED) have been paid more and more attention due to their high efficiency, little volume, long service life, mercury pollution-free, and energy conversation [1,2,3,4,5]. e properties of phosphors as supporting materials have great effect on the luminescence efficiency, the brightness, and Ra of white LED. e phosphors for white LED should meet the following requirements
The luminescence of Eu2+ consists of a 4f65d1-4f7(8S7/2) broad-band emission, which belongs to electric-dipole allowed transition and has the properties of large absorption of UV-NUV band light and broad emission range from ultraviolet to infrared light depending on different crystal-lattice environment
We have developed a new kind of synthesis method, that is, the gel-combustion method, for the synthesis of silicate luminescent materials [8, 9]. is method has several advantages, including low calcination temperature, short calcination time, easy operation, the uniformity of product ingredients, and small particles with good dispersity
Summary
White light emitting diodes (LED) have been paid more and more attention due to their high efficiency, little volume, long service life, mercury pollution-free, and energy conversation [1,2,3,4,5]. e properties of phosphors as supporting materials have great effect on the luminescence efficiency, the brightness, and Ra of white LED. e phosphors for white LED should meet the following requirements. E properties of phosphors as supporting materials have great effect on the luminescence efficiency, the brightness, and Ra of white LED. Alkali earth halide and silicate compound are both effective host as the Eu2+ luminescence matrices. Alkali earth chlorosilicate crystal has lower synthesis temperature and higher physical chemistry stability [7]; it is easy access to the effective excitation from UV-NUV band, so it is used widely in varieties of displays and lighting equipments. The luminescence of Eu2+ consists of a 4f65d1-4f7(8S7/2) broad-band emission, which belongs to electric-dipole allowed transition and has the properties of large absorption of UV-NUV band light and broad emission range from ultraviolet to infrared light depending on different crystal-lattice environment. The effects of the concentration of Eu2+, the reductive temperature and the doping amount of Mg2+ on luminescent properties were studied
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