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- W2624512867 abstract "Europium doped BaAl(12)O(19) powder phosphors have been synthesized by combustion process within few minutes. The phosphors have been characterized by XRD, SEM, FT-IR, EPR and PL techniques. The EPR spectrum exhibits an intense resonance signal at g = 1.96 characteristic of Eu(2+) ions. In addition to this two weak resonance signals have been observed at g = 2.28 and g = 4.86. The population of the spin levels (N) for the resonance signal at g = 1.96 is calculated as a function of temperature. By post-treating the phosphor at 1350 degrees C under a reducing atmosphere, it is observed that the population of spin levels has been increased five times. The excitation spectrum shows a peak at 326 run with a shoulder at 290 nm. Upon excitation at 326 rim, the emission spectrum exhibits a well defined broad band with maximum at 444 nm emitting a blue light corresponding to 4f(6)5d -> 4f(7) transition. The luminescence intensity also has been enhanced to 60% by post-treating the phosphor at 1350 degrees C under a reducing atmosphere. (C) 2009 Elsevier B.V. All rights reserved." @default.
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- W2624512867 date "2010-04-01" @default.
- W2624512867 modified "2023-10-18" @default.
- W2624512867 title "Luminescence and EPR studies of Eu(2+) doped BaAl(12)O(19) blue light emitting phosphors" @default.
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