Near infrared photostimulated persistent luminescence and information storage of SrAl2O4:Eu2+, Dy3+ phosphor

Haibo Liu, Baoluo Feng, Li Luo*, Chunlong Han, Peter A. Tanner*

*Corresponding author for this work

Research output: Contribution to journalJournal articlepeer-review

26 Citations (Scopus)

Abstract

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.

Original languageEnglish
Pages (from-to)3375-3385
Number of pages11
JournalOptical Materials Express
Volume6
Issue number11
DOIs
Publication statusPublished - 1 Nov 2016

Scopus Subject Areas

  • Electronic, Optical and Magnetic Materials

Fingerprint

Dive into the research topics of 'Near infrared photostimulated persistent luminescence and information storage of SrAl2O4:Eu2+, Dy3+ phosphor'. Together they form a unique fingerprint.

Cite this