Journal of the Society of Inorganic Materials, Japan
Online ISSN : 2185-4378
ISSN-L : 1345-3769
ユウロピウム (II), プラセオジム (III) 共付活リチウム固溶硫化カルシウムの残光特性
小嶋 芳行青柳 健一安江 任
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ジャーナル フリー

2006 年 13 巻 323 号 p. 228-233

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This study was made to investigate about the effect of initial Li/Ca atomic ratio on improvement of afterglow time of Eu2+, Pr3+ codoped CaS. Eu2+, Pr3+ codoped CaS with Li (phosphor) was synthesized by reducing mixture of Li2CO3 and Eu3+, Pr3+ codoped CaSO4·2H2O.
The lattice constant of the obtained phosphor expanded by incorporation of Li+ ion into CaS structure. This result was because Li+ ion invaded to the interstice of lattice. The phosphor emitted red by irradiation of black light and D65 lamp. The emission wavelength of phosphor was observed at 644 nm. In the case of initial Li/Ca atomic ratio of 0.04, the afterglow time of phosphor irradiated light of 486 nm was greatest 80 minutes. The afterglow time was prolonged to about 5 times by forming cation hole which could capture a lot of electron. The phosphor had the two kinds of cation hole formed by incorporation of Li+ ion and Pr3+ ion. The improvement in afterglow time was because depth of a trap of cation hole formed by addition of a Li+ ion was shallow. The depths of trap of cation hole formed by incorporation of Pr3+ ion and Li+ ion determined by the Hoogenstraaten method were 0.202 eV and 0.118 eV, respectively.

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