Citation:
GONG Shi-Xing, TIAN Yi-Guang, ZHANG Qiao, CHEN Li-Wei, MAO Pei. Structure and Luminescence Properties of Phosphors (Ca, Me)La4Si3O13:Eu3+ (Me=Sr, Ba)[J]. Chinese Journal of Inorganic Chemistry,
;2013, 29(6): 1192-1198.
doi:
10.3969/j.issn.1001-4861.2013.00.153
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A series of phosphors (Ca, Me)La4Si3O13:Eu3+ (Me=Sr, Ba) were prepared via solid-state reactions. The variations of lattice parameters and the luminescence properties were investigated based on modifying dopant concentration of Eu3+ and substitution amount of Ca2+ by Sr2+ or Ba2+ in the host. The optimal mole ratio nEu3+ to nLa3+ in the phosphor is 1:7 and the intensity ratio of emission transition 5D0-7F2 to 5D0-7F1 is 2.55 in the studied range. The lattice parameters a and c reduce linearly with concentrations of dopant Eu3+ and c is more noticeable so that a/c value increases. There are linear relationships between lattice parameters and substitution amounts of Sr2+ or Ba2+ to Ca2+ in host, but values of a and c increase and that of a/c decreases due to continuous solid solutions formed. The maximum of the luminescent intensities of Eu3+ emission appears in the sample in which the substitution amount of Sr2+ to Ca2+ is 0.4 mole per mole host, however, the intensities increase with the substitution concentrations of Ba2+ ions all the while,as well as a change in rate of grade at content 0.4 of Ba2+ ion,and the most intensity reaches till whole substitution. The CIE of the sample is (0.638 5, 0.353 0).
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Keywords:
- LED;phosphor;apatite;silicate;Eu3+
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