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Trap distribution and photo‐stimulated luminescence in LaSrAl 3 O 7 :Eu 2+ long‐lasting phosphors for optical data storage
Author(s) -
Wang Bo,
Wang Hongwei,
Huang Jianhui,
Zhou Jiangcong,
Liu Pengfei
Publication year - 2020
Publication title -
journal of the american ceramic society
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.9
H-Index - 196
eISSN - 1551-2916
pISSN - 0002-7820
DOI - 10.1111/jace.16736
Subject(s) - phosphor , luminescence , thermoluminescence , analytical chemistry (journal) , materials science , persistent luminescence , photoluminescence , tetragonal crystal system , optics , optoelectronics , chemistry , crystal structure , physics , crystallography , chromatography
Here, a green emission persistent luminescent phosphor LaSrAl 3 O 7 :Eu 2+ 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 P42 1 m . The Eu 2+ :5 d ‐4 f 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 LaSrAl 3 O 7 :Eu 2+ 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 LaSrAl 3 O 7 :Eu 2+ phosphor.