Site occupancy and mechanisms of thermally stimulated luminescence in Ca9Ln(PO4)7 (Ln = lanthanide)
作者： Aurélie Bessière , Rajia Aït Benhamou , Gilles Wallez , Aurélie Lecointre , Bruno Viana
DOI: 10.1016/J.ACTAMAT.2012.08.034
关键词:
摘要: Abstract The structural properties, X-ray-excited radioluminescence and thermally stimulated luminescence (TSL) of Ca 9 Ln (PO 4 ) 7 ( = La, Ce, Pr, Nd, Sm, Eu, Gd, Tb, Dy, Ho, Er, Tm, Yb, Lu) were investigated. (La–Nd) occupied mainly the largest M 3 site, whereas smallest lanthanides (Yb, adopted octahedral 5 site. intermediate-sized ions (Sm–Tm) medium-sized sites 1 2. Only 3+ with highest 3+/4+ ionization energy = Pr, Dy) able to trap holes become luminescent centers for f –4 emission. For low potential Lu), no hole trapping at was possible Mn 2+ impurities effective traps d –3 red Very broad TSL peaks attributed assisted detrapping electrons from positive traps, possibly sites, tunneling back towards trap/luminescent center. compounds doped = Tb or Lu found be efficient long-lasting phosphorescence materials, emitting in green red, respectively.
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