@article{oai:uec.repo.nii.ac.jp:00009972,
 author = {Tamura, Yuki and Okuno, Tsuyoshi and Suda, Yoriko and Nanai, Yasushi},
 issue = {15},
 journal = {Journal of Physics D: Applied Physics},
 month = {Feb},
 note = {Excitation wavelength dependence of red persistent luminescence in CaS:Eu2+,Tm3+ phosphor is reported. Persistent luminescence appears under visible light excitation in the wavelength region of 400–600nm. Photon energy from white light-emitting diode lamps is possibly stored in this material. This sulfide phosphor is synthesized using iodine vapor. Under iodine vapor, Eu2+ and Tm3+ are found to be efficiently included in CaS. The concentration dependence of Eu2+ is studied, and the optimum concentration is 0.05%. Trap depth of 0.27–0.33eV contributing to persistent luminescence is evaluated by using thermoluminescence.},
 title = {Red persistent luminescence excited by visible light in CaS:Eu2+,Tm3+},
 volume = {53},
 year = {2020}
}