TY - JOUR
T1 - Near infrared photostimulated persistent luminescence and information storage of SrAl2O4:Eu2+, Dy3+ phosphor
AU - Liu, Haibo
AU - Feng, Baoluo
AU - Luo, Li
AU - Han, Chunlong
AU - Tanner, Peter A.
N1 - Funding information:
National Natural Science Foundation of China (Grant No. 11574058); Science and Technology Program of Guangzhou City of China (Grant No. 201607010102).
Publisher Copyright:
© 2016 Optical Society of America.
PY - 2016/11/1
Y1 - 2016/11/1
N2 - The phosphor Sr0.97Al2O4:0.01Eu2+, 0.02Dy3+ was synthesized by a high temperature solid state reaction in a reducing atmosphere. After charging by ultraviolet radiation, the persistent luminescence decay was divided into different time ranges and well-fitted by a biexponential function, but the two lifetimes became longer with time of persistent luminescence decay. The fractional amplitude of the shorter lifetime increased with time, whereas that of the longer lifetime decreased. The change in lifetime has been associated with the emptying of a pseudo-continuum of trap states either from different traps or different levels of the same trap species. The investigation in photostimulated persistent luminescence indicated the sample could emit bright persistent luminescence again under infrared light excitation after the UV light-excited persistent luminescence had decayed completely. The NIR photostimulation exhibited a continuous broad band, with maximum at 760 nm, representing the emptying of filled traps into the conduction band. These results also infer that the traps are pseudo-continuous but the assignment of Dy2+ as the trapped species cannot be excluded. The read-in and write-out properties of the phosphor have been elucidated and these convey applications in information storage and retrieval.
AB - The phosphor Sr0.97Al2O4:0.01Eu2+, 0.02Dy3+ was synthesized by a high temperature solid state reaction in a reducing atmosphere. After charging by ultraviolet radiation, the persistent luminescence decay was divided into different time ranges and well-fitted by a biexponential function, but the two lifetimes became longer with time of persistent luminescence decay. The fractional amplitude of the shorter lifetime increased with time, whereas that of the longer lifetime decreased. The change in lifetime has been associated with the emptying of a pseudo-continuum of trap states either from different traps or different levels of the same trap species. The investigation in photostimulated persistent luminescence indicated the sample could emit bright persistent luminescence again under infrared light excitation after the UV light-excited persistent luminescence had decayed completely. The NIR photostimulation exhibited a continuous broad band, with maximum at 760 nm, representing the emptying of filled traps into the conduction band. These results also infer that the traps are pseudo-continuous but the assignment of Dy2+ as the trapped species cannot be excluded. The read-in and write-out properties of the phosphor have been elucidated and these convey applications in information storage and retrieval.
UR - http://www.scopus.com/inward/record.url?scp=84994565825&partnerID=8YFLogxK
U2 - 10.1364/OME.6.003375
DO - 10.1364/OME.6.003375
M3 - Journal article
AN - SCOPUS:84994565825
SN - 2159-3930
VL - 6
SP - 3375
EP - 3385
JO - Optical Materials Express
JF - Optical Materials Express
IS - 11
ER -