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

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 mat...

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Bibliographic Details
Published in:Angewandte Chemie International Edition 2020-09, Vol.59 (37), p.16054-16060
Main Authors: Lei, Yunxiang, Dai, Wenbo, Guan, Jianxin, Guo, Shuai, Ren, Fei, Zhou, Yudai, Shi, Jianbing, Tong, Bin, Cai, Zhengxu, Zheng, Junrong, Dong, Yuping
Format: Article
Language:English
Subjects:
anti-counterfeiting
Color
Color tunable
host–guest systems
Inks
Medical imaging
Organic materials
Phosphorescence
Phosphors
room-temperature phosphorescence
Security
security inks
Temperature dependence
Time dependence
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Summary: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. Multicolor swap shop: A facile doping approach for color‐tunable organic phosphorescence materials is enabled through hosts that not only restrict the molecular motion and avoid the triplet quenching from the oxygen, but also interact with the guests for the realization of phosphorescence. Color tunable, temperature dependent, and time‐resolved anti‐counterfeiting techniques are achieved by the printable and writable materials.
ISSN:1433-7851
1521-3773
DOI:10.1002/anie.202003585