Department of Physics, Govt. Arts & Commerce Girls College, Devendra Nagar Raipur (C.G.), 492001, India.
Luminescence. 2015 Mar;30(2):175-81. doi: 10.1002/bio.2710. Epub 2014 Jun 22.
The thermoluminescence (TL) of nanoparticles has become a matter of keen interest in recent times but is rarely reported. This article reports the synthesis of ZnS:Mn nanocrystals using a chemical route, with mercaptoethanol (ME) as the capping agent. The particle sizes for the nanocrystals were measured by X-ray diffraction (XRD) and also by studying transmission electron microscopy (TEM) patterns. The particle sizes of the synthesized samples were found to be between 1 and 3 nm. For samples with different concentrations of the capping agent, it was found that the TL intensity of the ZnS:Mn nanoparticles increased as the particle size decreased. A shift in the peak position of the TL glow curve was also seen with decreasing particle size. The TL intensity was found to be maximal for samples with 1.2% of Mn. A change in the peak position was not found for samples with different concentrations of Mn. The half-width glow peak curve method was used to determine the trap-depth. The frequency factor of the synthesized samples was also calculated. The stability of the charge carriers in the traps increases with decreasing nanoparticle size. The higher stability may be attributed to the higher surface/volume ratio and also to the increase in the trap-depth with decreasing particle size.
纳米粒子的热释光（TL）近年来成为人们关注的焦点，但很少有报道。本文报道了使用化学途径合成 ZnS:Mn 纳米晶，巯基乙醇（ME）作为封端剂。通过 X 射线衍射（XRD）和透射电子显微镜（TEM）研究了纳米晶的粒径。合成样品的粒径被发现在 1 到 3nm 之间。对于不同浓度封端剂的样品，发现 ZnS:Mn 纳米粒子的 TL 强度随着粒径的减小而增加。随着粒径的减小，TL 发光曲线的峰位也发生了偏移。对于含有 1.2% Mn 的样品，TL 强度最大。对于不同浓度 Mn 的样品，峰位没有发生变化。使用半高宽发光峰曲线法确定了陷阱深度。还计算了合成样品的频率因子。随着纳米粒子尺寸的减小，载流子在陷阱中的稳定性增加。较高的稳定性可能归因于更高的比表面积和随粒径减小而增加的陷阱深度。
