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Investigation on Luminescence Properties of a Long Afterglow Phosphor Ca 2 SnO 4 :Tm 3+
Author(s) -
Li HaiFeng,
Sun WenZhi,
Jia YongLei,
Ma TengFei,
Fu JiPeng,
Li Da,
Zhang Su,
Jiang LiHong,
Pang Ran,
Li ChengYu
Publication year - 2015
Publication title -
chemistry – an asian journal
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.18
H-Index - 106
eISSN - 1861-471X
pISSN - 1861-4728
DOI - 10.1002/asia.201500580
Subject(s) - afterglow , phosphor , thermoluminescence , phosphorescence , dopant , luminescence , photoluminescence , analytical chemistry (journal) , materials science , persistent luminescence , ion , doping , spectroscopy , chemistry , optics , physics , optoelectronics , fluorescence , gamma ray burst , chromatography , astronomy , organic chemistry , quantum mechanics
A series of new long afterglow phosphors Ca 2 SnO 4 : x Tm 3+ were synthesized by using traditional solid‐state reactions. XRD measurements and Rietveld refinement revealed that the incorporation of the Tm 3+ dopants generated no second phase other than the original one of Ca 2 SnO 4 , which indicated that the dopants completely merged into the host. The corresponding optical properties were further systematically studied by photoluminescence, phosphorescence, and thermoluminescence (TL) spectroscopy. The results show that the Tm 3+ ‐related defects account for the bright bluish green afterglow emission from the characteristic f–f transitions of Tm 3+ ions. The bluish green long‐lasting phosphorescence could be observed for 5 h by the naked eye in a dark environment after the end of UV irradiation. Two TL peaks at 325 and 349 K from the TL curves were adopted to calculate the depth of the traps, which were 0.45 and 0.78 eV, respectively. The mechanism of the long afterglow emission was also explored.