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. 2020 Sep 7;59(37):16054-16060.
doi: 10.1002/anie.202003585. Epub 2020 Jul 7.

Wide-Range Color-Tunable Organic Phosphorescence Materials for Printable and Writable Security Inks

Yunxiang Lei  1 , Wenbo Dai  1 , Jianxin Guan  2 , Shuai Guo  1 , Fei Ren  1 , Yudai Zhou  1 , Jianbing Shi  1 , Bin Tong  1 , Zhengxu Cai  1 , Junrong Zheng  2 , Yuping Dong  1
Affiliations

Wide-Range Color-Tunable Organic Phosphorescence Materials for Printable and Writable Security Inks

Yunxiang Lei et al. Angew Chem Int Ed Engl. .

Abstract

Organic materials with long-lived, color-tunable phosphorescence are potentially useful for optical recording, anti-counterfeiting, and bioimaging. Herein, we develop a series of novel host-guest organic phosphors allowing dynamic color tuning from the cyan (502 nm) to orange red (608 nm). Guest materials are employed to tune the phosphorescent color, while the host materials interact with the guest to activate the phosphorescence emission. These organic phosphors have an ultra-long lifetime of 0.7 s and a maximum phosphorescence efficiency of 18.2 %. Although color-tunable inks have already been developed using visible dyes, solution-processed security inks that are temperature dependent and display time-resolved printed images are unprecedented. This strategy can provide a crucial step towards the next-generation of security technologies for information handling.

Keywords: Color tunable; anti-counterfeiting; host-guest systems; room-temperature phosphorescence; security inks.

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