Excitation wavelength dependence of red persistent luminescence in ##IMG## [http://ej.iop.org/images/0022-3727/53/15/155101/dab6d1cieqn001.gif] phosphor is reported. Persistent luminescence appears under visible light excitation in the wavelength region of 400–600 nm. 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, Eu 2+ and Tm 3+ are found to be efficiently included in CaS. The concentration dependence of Eu 2+ is studied, and the optimum concentration is 0.05%. Trap depth of 0.27–0.33 eV contributing to persistent luminescence is evaluated by using thermoluminescence.

中文翻译：

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CaS：Eu 2+，Tm 3+中可见光激发的红色持续发光

报道了## IMG ##荧光粉中红色持续发光的激发波长依赖性[http://ej.iop.org/images/0022-3727/53/15/155101/dab6d1cieqn001.gif]。在可见光激发下，在400–600 nm的波长范围内会出现持久发光。来自白色发光二极管灯的光子能量可能存储在这种材料中。该硫化物荧光粉是使用碘蒸气合成的。发现在碘蒸气下，Eu 2+和Tm 3+有效地包含在CaS中。研究了Eu 2+的浓度依赖性，最佳浓度为0.05％。使用热致发光评估了有助于持续发光的陷阱深度为0.27–0.33 eV。