. 2010, 41(06): 48-0.
Abstract (
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Ca2SiO3Cl2:Eu3+ phosphor was synthesized by high temperature solid state reaction. CaCO3 (A. R.), SiO2 (A. R.), NH4Cl (A. R.), Li2CO3 (A. R.) and Eu2O3 (99.99%) were used for starting materials. After these individual materials were blended and grounded thoroughly in an agate mortar, the homogeneous mixture was heated at 850℃ for 3 h, and the phosphor was obtained. The phase present of the samples was characterized by powder x-ray diffraction (XRD) (D/max-rA, Cu K?, 40 kV, 40 mA, λ=0.15406 nm). The excitation and emission spectra of these phosphors were measured by a SHIMADZU RF-540 fluorescence spectrophotometer. The phosphor shows five major emission peaks locating at 582, 599, 623, 655 and 691 nm, which correspond to the 5D0→7F0, 7F1, 7F2, 7F3 and 7F4 characteristics transport of Eu3 +, respectively. The influence of the concentration of Eu3+ ions to the emission intensity was investigated. Firstly, the intensities increase with increasing Eu3+ concentration, then, decrease because of concentration quenching. It reaches the maximum content of 1% Eu3+, and the concentration self-quenching is the dipole– dipole interaction based on the Dexter theory. The emission intensity of Ca2SiO3Cl2:Eu3+ phosphor was enhanced by doping Li+. The results show that Ca2SiO3Cl2:Eu3+ phosphor is a promising red phosphor for white light emitting diode(w-LED) based on UV InGaN chip.