Abstract The zinc-blende-to-wurtzite transition of thioglycolic acid (TGA)-capped ZnS:Mn2+ QDs prepared at 80 °C in air has been observed with the increasing TGA/Zn2+ ratios. Effects of structure on the photoluminescence characteristics of ZnS:Mn2+ QDs were studied in this paper. The relative PL intensity ratio of the Mn2+ orange-red emission and the ZnS blue emission (IOE/IBE) and color purity (CP) (CP ≈ 65.6%) were maximum with the optimal molar ratio of TGA/Zn2+ = 3, which indicate the efficient transmission of excitation energy from the ZnS host to the Mn2+ impurity. Furthermore, the investigated result shows that the energy transfer in the cubic ZnS host lattice is more efficient than that of the hexagonal ZnS and the color correlated temperature (CCT) values increase with increasing the TGA/Zn2+ ratio. The crystal field strength (Dq) values of ZnS:Mn2+ QDs decrease from 603 cm−1 to 455 cm−1 with the increasing of the TGA/Zn2+ ratio from 0 to 6, respectively. The ZnS:Mn2+ QDs were applied in anti-counterfeiting ink, which was written on a glass sheet. The image was then excited by normal light and 385 nm UV light excitation, which emitted orange-red color with the UV light excitation. These investigated results can be particularly suitable for security ink applications or optoelectronic devices. Moreover, the zinc-blende-to-wurtzite phase transition in this study will be of great importance for the family of ZnS-based doped quantum dots.

中文翻译：

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结构对Mn2+掺杂ZnS量子点用于防伪油墨的光致发光特性的影响

摘要 随着 TGA/Zn2+ 比率的增加，观察到在 80 °C 空气中制备的巯基乙酸 (TGA) 封端的 ZnS:Mn2+ QD 的闪锌矿到纤锌矿转变。本文研究了结构对ZnS:Mn2+ QDs光致发光特性的影响。当 TGA/Zn2+ 的最佳摩尔比为 3 时，Mn2+ 橙红色发射和 ZnS 蓝色发射的相对 PL 强度比（IOE/IBE）和色纯度（CP）（CP ≈ 65.6%）最大，这表明激发能量从 ZnS 主体到 Mn2+ 杂质的有效传输。此外，研究结果表明立方 ZnS 主晶格中的能量转移比六方 ZnS 更有效，并且颜色相关温度 (CCT) 值随着 TGA/Zn2+ 比率的增加而增加。随着 TGA/Zn2+ 比值从 0 增加到 6，ZnS:Mn2+ QD 的晶体场强 (Dq) 值分别从 603 cm-1 降低到 455 cm-1。ZnS:Mn2+ QDs 被应用于防伪油墨中，该油墨写在玻璃板上。然后图像被普通光和 385 nm 紫外光激发激发，在紫外光激发下发出橙红色。这些研究结果特别适用于安全油墨应用或光电设备。此外，本研究中闪锌矿到纤锌矿的相变对于基于 ZnS 的掺杂量子点家族非常重要。然后图像被普通光和 385 nm 紫外光激发激发，在紫外光激发下发出橙红色。这些研究结果特别适用于安全油墨应用或光电设备。此外，本研究中闪锌矿到纤锌矿的相变对于基于 ZnS 的掺杂量子点家族非常重要。然后图像被普通光和 385 nm 紫外光激发激发，在紫外光激发下发出橙红色。这些研究结果特别适用于安全油墨应用或光电设备。此外，本研究中闪锌矿到纤锌矿的相变对于基于 ZnS 的掺杂量子点家族非常重要。