Preparation and Characteristics of Eu and Dy Doped Sr4Al14O25 Phosphor

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Sr4Al14O25:Eu2+, Dy3+ long persistent phosphors with different B, Eu and Dy contents were prepared by solid phase reaction at various temperatures in H2/N2=1/9 atmosphere. X- ray diffraction and scanning electron microscopy observations showed that, when the phosphor was doped with 40 at% B, single dense Sr4Al14O25 phase was formed but for the samples with less than 40 at% B, mixed phases containing SrAl12O19 and SrAl2O4 were observed while for higher B content (100 at%) SrAl2B2O7 phases appeared. The phosphor showed emission peak centered at 500 nm with blue green color. When 40 at% of H3BO3 was added and doped with 4 at% of Eu and 8 at% of Dy, it showed the maximum initial intensity of 3170 mcd.m-2 and the longest persistency which is greater than 20 h over value of 5 mcd.m-2.

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Edited by:

Byungsei Jun, Hyungsun Kim, Chanwon Lee, Soo Wohn Lee

Pages:

249-252

Citation:

H. N. Luitel et al., "Preparation and Characteristics of Eu and Dy Doped Sr4Al14O25 Phosphor", Materials Science Forum, Vol. 569, pp. 249-252, 2008

Online since:

January 2008

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$38.00

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