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Smart responsive phosphorescent materials for data recording and security protection. 2014

Huibin Sun, and Shujuan Liu, and Wenpeng Lin, and Kenneth Yin Zhang, and Wen Lv, and Xiao Huang, and Fengwei Huo, and Huiran Yang, and Gareth Jenkins, and Qiang Zhao, and Wei Huang
1] Key Laboratory for Organic Electronics & Information Displays and Institute of Advanced Materials, Nanjing University of Posts & Telecommunications, 9 Wenyuan Road, Nanjing 210023, China [2] Institute of Advanced Materials and Jiangsu-Singapore Joint Research Center for Organic/Bio- Electronics & Information Displays, Nanjing Tech University, 30 South Puzhu Road, Nanjing 211816, China [3].

Smart luminescent materials that are responsive to external stimuli have received considerable interest. Here we report ionic iridium (III) complexes simultaneously exhibiting mechanochromic, vapochromic and electrochromic phosphorescence. These complexes share the same phosphorescent iridium (III) cation with a N-H moiety in the N^N ligand and contain different anions, including hexafluorophosphate, tetrafluoroborate, iodide, bromide and chloride. The anionic counterions cause a variation in the emission colours of the complexes from yellow to green by forming hydrogen bonds with the N-H proton. The electronic effect of the N-H moiety is sensitive towards mechanical grinding, solvent vapour and electric field, resulting in mechanochromic, vapochromic and electrochromic phosphorescence. On the basis of these findings, we construct a data-recording device and demonstrate data encryption and decryption via fluorescence lifetime imaging and time-gated luminescence imaging techniques. Our results suggest that rationally designed phosphorescent complexes may be promising candidates for advanced data recording and security protection.

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