Layer-by-layer assembly of long-afterglow self-supporting thin films with dual-stimuli-responsive phosphorescence and antiforgery applications
- 288 Downloads
The assembly of thin films (TFs) having long-lasting luminescence can be expected to play an important role in the development of new-generation smart sensors, anti-counterfeiting materials, and information-encryption systems. However, such films are limited compared with their powder and solution counterparts. In this study, by exploiting the self-organization of phosphors in the two-dimensional (2D) galleries between clay nanosheets, we developed a method for the ordered assembly of long-afterglow TFs by utilizing a hydrogen-bonding layer-by-layer (LBL) process. Compared with the pristine powder, the TFs exhibit high polarization and up-conversion room-temperature phosphorescence (RTP), as well as enhanced quantum yields and luminescence lifetimes, allowing them to be used as room-temperature phosphorescent sensors for humidity and oxygen. Moreover, modified clay-based hybrids with multicolor RTP can serve as anti-counterfeiting marks and triple-mode 2D barcode displays. We anticipate that the LBL assembly process can be extended to the fabrication of other inorganic–organic room-temperature phosphorescent hybrids with smart luminescent sensor and antiforgery applications.
Keywordslayer-by-layer self-supporting thin film 2D ultrathin nanosheets sensor phosphorescence
Unable to display preview. Download preview PDF.
This work was supported by the National Basic Research Program of China (973 Program) (No. 2014CB932103), the National Natural Science Foundation of China (Nos. 21301016 and 21473013), the Beijing Municipal Natural Science Foundation (No. 2152016), and the Fundamental Research Funds for the Central Universities.
- Ghosh, Y.; Mangum, B. D.; Casson, J. L.; Williams, D. J.; Htoon, H.; Hollingsworth, J. A. New insights into the complexities of shell growth and the strong influence of particle volume in nonblinking “Giant” core/shell nanocrystal quantum dots. J. Am. Chem. Soc. 2012, 134, 9634–9643.CrossRefGoogle Scholar
- Li, Z. X.; Liang, R. Z.; Xu, S. M.; Liu W. D.; Yan, D. P.; Wei, M.; Evans, D. G.; Duan, X. Multi-dimensional, lightcontrolled switch of fluorescence resonance energy transfer based on orderly assembly of 0D dye@micro-micelles and 2D ultrathin-layered nanosheets. Nano Res. 2016, 9, 3828–3838.CrossRefGoogle Scholar
- Tian, R.; Zhang, S. T.; Li, M. W.; Zhou, Y. Q.; Lu, B.; Yan, D. P.; Wei, M.; Evans, D. G.; Duan, X. Localization of Au nanoclusters on layered double hydroxides nanosheets: Confinement-induced emission enhancement and temperatureresponsive luminescence. Adv. Funct. Mater. 2015, 25, 5006–5015.CrossRefGoogle Scholar
- Yan, D. P.; Lu, J.; Wei, M.; Qin, S. H.; Chen, L.; Zhang, S. T.; Evans, D. G.; Duan, X. Heterogeneous transparent ultrathin films with tunable-color luminescence based on the assembly of photoactive organic molecules and layered double hydroxides. Adv. Funct. Mater. 2011, 21, 2497–2505.CrossRefGoogle Scholar