Luminescence Properties of Eu, Dy Doped BaAl12 O-19 Long Afterglow Phosphors

作者：Xiong Yi; Wang Yin hai^*; Hu Zheng fa; Li Ya; Peng Tie qiu; Zhao Hui

来源：Spectroscopy and Spectral Analysis, 2012, 32(3): 614-618.

DOI：10.3964/j.issn.1000-0593(2012)03-0614-05

• BaAl12O19
• Rare-earth doped
• Thermoluminescence
• Long afterglow

Long afterglow phosphors BaAl12O19 : Eu2 /Eu3 , Dy3 were synthesized by high temperature solid state method under different atmosphere. X-ray powder diffraction (XRD) shows that pure BaAl12O19 phase structure was obtained and the doping ions Eu2 /Eu3 , Dy3 didn't change the phase structure. By comparison, the authors found that the doping ions Eu2 / Eu3 , Dy3 Eu3 , Dy3 caused the XRD diffraction peaks moving to the high angle slightly which displayed that the inter-planar crystal spacing was changed via Eu and Dy replacing Ba lattice in BaAl12O19. Emission spectra show that all the samples prepared under different conditions exhibit the 4f(6)5d(1)-> 4f(1) broadband transition which is the features emission of Eu2 and the existence of the features emission of Eu2 in the sample synthesized in air indicates that Eu3 ions can be reduced to divalent state in air. The doping ions Dy3 can not only enhance the luminous intensity of samples but also make the samples to obtain long afterglow characteristics. The afterglow decay and thermoluminescence studies of the Eu, Dy co-doped sample synthesized under reducing atmosphere reveal that the sample has good long afterglow properties at room temperature and high temperature.

• 出版日期2012-3
• 单位广东工业大学