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Photoluminescence decay kinetics of doped ZnS nanophosphors

机译：掺杂的ZnS纳米磷光体的光致发光衰减动力学

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摘要

Doped nanophosphor samples of ZnS: Mn, ZnS: Mn, Co and ZnS: Mn, Fe were prepared using a chemical precipitation method. Photoluminescence (PL) spectra were obtained and lifetime studies of the nanophosphors were carried out at room temperature. To the best of our knowledge, there are very few reports on the photoluminescence investigations of Co-doped or Fe-doped ZnS: Mn nanoparticles in the literature. Furthermore, there is no report on luminescence lifetime shortening of ZnS: Mn nanoparticles doped with Co or Fe impurity. Experimental results showed that there is considerable change in the photoluminescence spectra of ZnS: Mn nanoparticles doped with X (X = Co, Fe). The PL spectra of the ZnS: Mn, Co nanoparticle sample show three peaks at 410, 432 and 594 nm, while in the case of the ZnS: Mn, Fe nanoparticle sample the peaks are considerably different. The lifetimes are found to be in microsecond time domain for 594 nm emission, while nanosecond order lifetimes are obtained for 432 and 411 nm emission in ZnS: Mn, X nanophosphor samples. These lifetimes suggest a new additional decay channel of the carrier in the host material.
机译：使用化学沉淀法制备了ZnS：Mn，ZnS：Mn，Co和ZnS：Mn，Fe的掺杂纳米磷样品。获得了光致发光（PL）光谱，并在室温下进行了纳米磷光体的寿命研究。据我们所知，文献中很少有关于Co掺杂或Fe掺杂的ZnS：Mn纳米颗粒的光致发光研究的报道。此外，没有关于掺杂有Co或Fe杂质的ZnS：Mn纳米粒子的发光寿命缩短的报道。实验结果表明，掺杂有X（X = Co，Fe）的ZnS：Mn纳米颗粒的光致发光光谱有很大变化。 ZnS：Mn，Co纳米颗粒样品的PL光谱在410、432和594 nm处显示三个峰，而在ZnS：Mn，Fe纳米颗粒样品的情况下，这些峰有很大不同。发现对于594 nm发射，寿命在微秒时域内，而在ZnS：Mn，X纳米磷光体样品中，对于432和411 nm发射，获得纳秒级的寿命。这些寿命表明基质材料中载体的新的额外衰变通道。

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