Studies on Some Infrared Stimulable Phosphors

Abstract

Physical properties of the two phosphor systems SrS:Ce,Sm, and SrS:Eu,Sm, as well as the base material SrS, have been studied. The optical studies concern spectra of transmission, excitation, fluorescence, phosphorescence, stimulation, and stimulated emission. Relative storage efficiencies of the major exciting wavelengths have been measured. Time characteristics of the phosphorescence and the infrared exhaustion have been determined. The dc photoconductive response as a function of the wavelength of the incident light has been studied. A simplified band-theory model which correlates all of the experimental data in conjunction with the electronic structures of the activators is presented.

Storage effect in LiRESiO4:Ce3+, Sm3+, RE=Y,Lu phosphor

“…Another type of this class of phosphors is the rare-earth doubly doped alkaline earth sulphides. The role of Ce 3+ as a hole trap and Sm 3+ as an electron trap has been studied in MgS:Ce 3+ ,Sm 3+ [1], CaS:Ce 3+ ,Sm 3+ [2], SrS:Ce 3+ ,Sm 3+ [3] storage phosphors, known as Infrared Stimulable Phosphor (ISP).…”

Dynamics of electron-trapping materials under blue light and near-infrared exposure: an improved model

“…The atomic structure and the dynamics of ETM under blue light and near-infrared (NIR) illumination have been known for sometime [11], and a few approximate models for the optical mechanism of ETM have been presented [12,13]. The first-order mathematical model that governs the ETM's dynamics was proposed in 1993 [12].…”

Lanthanide level location and charge carrier trapping in LiLnSiO4:Ce3+,Sm3+, Ln = Y or Lu

“…For example, the alkaline earth sulfides doped with the combination Eu 2+ and Sm 3+ or the combination Ce 3+ and Eu 3+ were intensively studied for their charge storage properties under optical or ionizing radiation excitation, and the materials were considered for optical data storage applications [2][3][4][5][6][7][8][9][10][11]. However, quantitative data on the location of electron trapping and electron donating levels were not published.…”