Photostimulated luminescence excited by infrared LEDs in CaS:Eu2+ red afterglow phosphors
Photostimulated luminescence excited by infrared LEDs in CaS:Eu2+ red afterglow phosphors
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DOI：
10.1088/1361-6463/ac9f52
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发表时间：
2022-11
期刊：
影响因子：
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通讯作者：
Syota Yamaguchi;Y. Suda;Y. Nanai;T. Okuno
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文献类型：
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作者：
Syota Yamaguchi;Y. Suda;Y. Nanai;T. Okuno
在 CaS:Eu2+ 余辉荧光粉中使用 940 nm 红外 (IR) 发光二极管激发时，会出现 650 nm 的红色光刺激发光 (PSL)。研究了 CaS:Eu2+ 中 Dy3+ 离子、碱金属离子或 Cl− 离子的掺杂对余辉或光刺激的影响。余辉时间衰减和热释光辉光曲线表明，Dy3+离子和碱金属离子在荧光粉中诱导不同类型的缺陷，并独立增强余辉。研究发现，Cl− 离子的掺杂可以增强红外激发的光刺激。即使用红外光照射荧光体几秒钟，余辉衰减曲线也与未用红外光照射时相同。负责光刺激的陷阱态与负责余辉的陷阱态不同。将磷光体置于黑暗中 60 分钟后，在 940 nm 的激发下出现红色光刺激。其强度是在黑暗中放置 10 分钟后产生的红色 PSL 的 68%。据认为，当样品保存在黑暗中时，PSL 几乎没有降低。
Red photostimulated luminescence (PSL) at 650 nm appears under the excitation by using an infrared (IR) light-emitting diode at 940 nm in CaS:Eu2+ afterglow phosphors. The effect of doping of Dy3+ ions, alkali metal ions or Cl− ions in CaS:Eu2+ on afterglow or photostimulation is investigated. Afterglow temporal decays and thermoluminescence glow curves suggest that Dy3+ ions and alkali metal ions induce different types of defects in the phosphor, and enhance the afterglow independently. Doping of Cl− ions is found to enhance the photostimulation by the IR excitation. Even if the phosphor is irradiated with IR light for some seconds, the afterglow decay curve is the same as when it is not irradiated with IR light. Trap states responsible for the photostimulation are different from those responsible for the afterglow. The red photostimulation appears under the excitation at 940 nm, after the phosphor is left in the dark for 60 min. Its intensity is 68% of the red PSL generated after being left in the dark for 10 min. It is considered that the PSL decreases little, when the sample is kept in the dark.