Synthesis of Ultrafine Long Afterglow Phosphor with High Brightness via Al₂O₃ Coating Route

Abstract:

Long afterglow phosphor is a special energy-saving material, which can store the energy of light irradiation and release light slowly. Ultrafine aluminate long afterglow phosphor is commonly prepared by the jet milling method. This method results in weak brightness, which restricts its application in delicate printing or textiles. In this study, fine particle aluminate phosphor (5μm) was coated by alumina, and then re-reduced under a high temperature. The alumina film works as a barrier layer, which protects the particles from sintering. The re-reduced phosphor had double afterglow brightness, and the size of the particle retained original level. The influences of pH value and KOH adding speed were investigated, the optimized parameters are: pH = 5, KOH adding speed = 2 ml/min.

References

[1] Lu X, Zhong MJ, Shu WG, Yu QM, Xiong XQ, Powder Technol. 177(2007) 83-86.

[2] Yu SF, Pi PH, Wen XF, Cheng J, Yang ZR., J. Inorg. Mater. 22(2007)642-646.

[3] Huang P, Cui CE, Wang S., Chin. Phys. B 18(2009)4524-4531.

[4] Zhang RX, Han GY, Zhang LW, Yang BS, Mater. Chem. Phys, 113(2009)255-259.

[5] Song HJ, Chen DH, J. Lumin. 22(2007)554-558.

[6] Du HY, Li GS, Sun JY, J. Rare Earths 25(2007)19-22.

[7] Sun YB, Qiu GM, Li XK, Zhang SQ, Yan CH, Zhang XY, Rare Met. 25(2006)615-619.

[8] Zhang P, Xu MX, Shen Y, Tian YM, J. Rare Earths 23(2005)26-29.

[9] Zhang YQ, Chen ZL, Zhou ZM, J. Electrochem. Soc. 153(2006)H86-H87.