Dual-emission Mn-doped CsPbCl3 QDs in collaboration with CsPbBr3 QDs applied in excitation-sensitive flexible anti-counterfeiting technologies

• Published in: Journal of solid state chemistry Vol. 332; p. 124584
• Main Authors: Yang, Zhen, Lin, Chang-Qing, Liu, Mao-Lin, Wang, Han, Pan, Chun-Yang
• Format: Journal Article
• Language: English
• Published: Elsevier Inc 01.04.2024
• Subjects: EHD; PDMS; QDs; EHD; QDs; PDMS
• ISSN: 0022-4596; 1095-726X
• DOI: 10.1016/j.jssc.2024.124584

In this study, we successfully synthesized CsPbBr3 QDs and Mn-doped CsPbCl3 QDs, which exhibited dual-wavelength emission and achieved a high photoluminescence quantum yield (PLQY) of up to 83.4 %. To enhance the environmental stability of the QDs, we synthesized QDs/Polycaprolactone (PCL) composites. Using the Electrohydrodynamic (EHD) printing technique, we printed composite patterns using CsPbBr3/PCL and Mn-doped CsPbCl3/PCL. These patterns displayed dual-color fluorescence when excited at 365 nm and single-color fluorescence when excited at 410 nm. This excitation-sensitive property is due to the significant difference in emission and absorption wavelengths between CsPbBr3 QDs and Mn-doped CsPbCl3 QDs. Furthermore, we transferred the pattern onto a flexible anti-counterfeiting label using a transfer printing technology with polydimethylsiloxane (PDMS). This research represents a significant advancement in the development of CsPbX3 QDs for flexible fluorescent anti-counterfeiting applications. CsPbBr3 and Mn-doped CsPbCl3 QDs are used to print composite patterns by EHD printing technique. The composite pattern exhibits both orange and green colors under ultraviolet light exposure, while only the green pattern is visible under blue light illumination. By encapsulating the pattern with PDMS, a flexible transparent anti-counterfeiting label is obtained. [Display omitted] •Mn-doped CsPbCl3 QDs in collaboration with CsPbBr3 QDs are applied in anti-counterfeiting technology.•A fluorescence anti-counterfeiting lable is created by using EHD technology.•The label exhibits varying color information by manipulating wavelength of exciting light.