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|Title:||ESR, PL and TL studies of LiAlO(2): Mn/Ce phosphor|
|Publisher:||PERGAMON-ELSEVIER SCIENCE LTD|
|Abstract:||LiAlO(2): Mn/Ce phosphor was prepared by combustion synthesis. LiAlO(2): Mn exhibits two thermoluminescence (TL) peaks around 150 and 320 degrees C while LiAlO(2): Cc exhibits TL peaks around 170 and 280 degrees C. PL emission of LiAlO(2): Mn consists of a peak around 500 rim when excited with 450 nm while LiAlO(2): Ce shows a broad band around 400 rim when excited by 320 nm. The TL emission Spectrum of LiAlO(2): Mn consists of a broad hand at 500 run attributed to the (4)T(1) to (6)A(1) transitions or Mn(2+) ion, indicating that Mn2+ is the luminescence centre in LiAlO(2): Mn. ESR studies were carried out to identify defect centres responsible for TL peaks observed in LiAlO(2): Ce. Room temperature ESR Spectrum of irradiated LiAlO(2): Cc phosphor appears to be superposition of at least four distinct centres. Two defect centres (centres I and II) are identified in irradiated LiAlO(2): Cc phosphor and these centres are assigned to O(-) and F(+) centres, respectively. O(-) centre appears to correlate with the 170 degrees C TL peak and F(+) centre appears to correlate with both 170 and 280 degrees C TL peaks in LiAlO(2): Cc. (C) 2007 Elsevier Ltd. All rights reserved.|
|Appears in Collections:||Proceedings papers|
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