Self-Activated Photostimulated Luminescence Properties and Stable Storage Capacity of Un-Doped Sr₃Al₂O₅Cl₂ Material for Potential Applications in Optical Storage

Abstract

Un-doped Sr3Al2OCl2 material is synthesized by conventional solid state method in reducing atmosphere. It shows intense photostimulated luminescence and the emission band of spectrum covers in 420-800 nm under infrared laser (980 nm) stimulation. Both the emission centers and traps are related to oxygen-deficient defects. Moreover, thermoluminescence indicates that there are at least five types of traps levels in this material. The weak long lasting phosphorescence (30 s) implies the lack of the shallow traps. The deep traps are rich and their storage capacity can be influenced by the releasing progress of the shallow traps. When the shallow traps are completely emptied after 6 h, the stable storage capacity of deep traps is still as large as 51.5%. Also, this material show good photostimulated luminescence under irradiation by infrared laser. Therefore, the un-doped Sr3Al2O5Cl2 material synthesized in reducing atmosphere can be considered as a potential photostimulated material for optical storage. Accordingly, the influence mechanism of traps on photostimulated luminescence is proposed.

Self‐Charging Persistent Mechanoluminescence with Mechanics Storage and Visualization Activities

“…Among them, the excitation peaks at 296, 327, and 358 nm could be ascribed to the 6 H 15/2 → 4 K 13/2 , 6 H 15/2 → 4 K 15/2 , and 6 H 15/2 → 6 P 7/2 , 4 M 15/2 transitions of Dy 3+ , respectively. [ 35 , 36 ] The peaks at 269 and 343 nm could be originated from the oxygen vacancy defects, [ 37 ] which could be further confirmed by the atmosphere experiment (details are presented in Figure S2 , Supporting Information). When excited by 358 nm, the SAOCD exhibits sharp emission peaks at 490, 580 and 674 nm, attributing to the characteristic 4 F 9/2 → 6 H 15/2 , 4 F 9/2 → 6 H 13/2 , 4 F 9/2 → 6 H 11/2 radiative transfers of Dy 3+ , respectively.…”

“…[ 36 ] It is also found in the PL emission spectra that there is a broad emission band from 400 to 450 nm produced by the oxygen vacancies. [ 37 ] The above PL and PLE analyses provide us abundant electronic structure information of SAOCD, which should be helpful for investigating the ML performance.…”

Structure, long persistent luminescent properties and mechanism of a novel efficient red emitting Ca2Ga2GeO7:Pr3+ phosphor

“…Since then, at least one thousand papers were published about LLP including active researches for application in various important fields. For example, emergency signage used in case of electricity failures is one of the main application [10][11], but other application were also proposed such as optical storage media [12][13], vivo bio-imaging [14], drug carriers [10], solar energy ultilization [15] and even photocatalysis [16][17]. Up to now, SrAl 2 O 4 :Eu 2+ ,Dy 3+ (green), CaAl 2 O 4 :Eu 2+ ,Nd 3+ (blue) and Y 2 O 2 S:Eu 3+ ,Ti 3+ ,Mg 2+ (red) are generally acknowledged to be the representative LPL phosphors [7][8][9].…”

“…For red photoluminescence (PL), the trivalent Eu 3+ , Sm 3+ and Pr 3+ ions, are favorable luminescent centers in solids because of their narrow-band emissions in red region. For host, the alkaline earth gallogermanates, such as (Sr,Ca) 3 Ga 2 Ge 4 O 14 (32414) [19], La 3 Ga 5 GeO 14 (35114) [20], Zn 3 Ga 2 Ge 2 O 10 (23310) [18], Zn 3 Ga 2 GeO 8 (3218) [21] and Ca 3 Ga 2 Ge 3 O 12 (32312) [13], have been previously used as the hosts for achieving efficient near-infrared (near-IR) LPL. It reveals that the alkaline earth gallogermanates could provide numerous distorted polyhedral sites for substitution, resulting in the presence of significant intrinsic lattice defects as traps around the emitters.…”

Novel Strategy for Designing Photochromic Ceramic: Reversible Upconversion Luminescence Modification and Optical Information Storage Application in the PbWO4:Yb3+, Er3+ Photochromic Ceramic

“…However, some problems occur in the above approaches. For example, the interference of electrons captured by the deep and shallow traps results in the considerable attenuation of optical storage signals in the long afterglow materials, causing the destructive read-out of signals. , For the luminescence glasses doped with Sm 3+ , the irradiation of femtosecond lasers is required . Uncontrollable agglomeration of nanocrystals doped with Sm 3+ results in the difference of signal intensity .…”