Trap distribution and photo‐stimulated luminescence in LaSrAl₃O₇:Eu²⁺ long‐lasting phosphors for optical data storage

Abstract

Here, a green emission persistent luminescent phosphor LaSrAl3O7:Eu2+ which is chargeable by UV light, was synthesized by solid‐state reaction method. Elemental mapping and fluorescence microscopy photoluminescence of the sample demonstrated the homogeneous distribution of La, Sr, Al, O, and Eu in the phosphor. Rietveld refinement shows that the as‐prepared sample belongs to the tetragonal crystalline structure with space group of P421m. The Eu2+:5d‐4f broad persistent luminescence with maximum emission peaking at 518 nm can be effectively obtained after irradiating in the UV light. A series of excitation temperature‐dependent thermoluminescence measurements were conducted to gain some insight into the information of traps. Additionally, to verify its feasibility of optical data storage, specific information letters were encoded on the LaSrAl3O7:Eu2+ phosphor films using the laser of 405 nm, then the stored information could indeed be read out by thermal stimulation as expected. Meanwhile, NIR photo‐stimulated red persistent luminescence was also obtained, which holds great potential for optical information storage. Finally, combined with the experimental and density functional theory calculation results, we proposed a tentative schematic diagram to account for the PersL and photo‐stimulated persistent luminescence mechanism in LaSrAl3O7:Eu2+ phosphor.

Recent Development in X-Ray Imaging Technology: Future and Challenges

“…Computed radiography, firstly introduced by Fujifilm in 1983, is a technology on the basis of recording the latent image in a photostimulable phosphor-contained imaging plate through laser-light stimulation [ 39 , 40 ]. A computed radiography system mainly comprises two components, including an imaging plate and a computed radiography reader.…”

High‐temperature persistent luminescence and visual dual‐emitting optical temperature sensing in self‐activated CaNb2O6: Tb3+ phosphor

“…In the process of rapid attenuation, the carrier decreases rapidly, which determines the PersL intensity. The slow attenuation process indicates that the carrier decreases slowly and determines the PersL time 23 …”

“…The slow attenuation process indicates that the carrier decreases slowly and determines the PersL time. 23 PersL performance is closely related to the depth of the trap and the number of electrons captured in the trap. In order to obtain the relevant information about the depth of the trap and the number of electrons captured in the trap, we tested the TL curve of the sample CNO: x%Tb 3+ (x = 0.0, 0.5, 1.0, 2.0, 3.0, and 4.0) irradiated with 254 nm UV lamp for 20 minute.…”

A New Near‐Infrared Long Persistent Luminescence Material with Its Outstanding Persistent Luminescence Performance and Promising Multifunctional Application Prospects

“…And it has been widely used in night lighting, defense military, optical memory, and many other aspects. [ 1–4 ] The development history of PersL materials is very long, and it has also been extensively studied and reported. [ 5 ] At present, the research on short‐wavelength visible PersL phosphor materials is relatively mature, such as SrAl 2 O 4 :Eu 2+ ,Dy 3+ (green, >24 h); [ 6 ] CaAl 2 O 4 :Eu 2+ ,Nd 3+ (blue, >19 h), [ 7 ] and Y 2 O 2 S:Eu 3+ ,Mg 2+ ,Ti 4+ (orange‐red, >5 h), [ 8 ] etc.…”