4.7 Article

Lifetime-tunable organic persistent room-temperature phosphorescent salts for large-area security printing

Journal

SCIENCE CHINA-MATERIALS
Volume 64, Issue 6, Pages 1485-1494

Publisher

SCIENCE PRESS
DOI: 10.1007/s40843-020-1544-6

Keywords

persistent room-temperature phosphorescence; organic salts; tunable lifetime; large-area processability; security printing

Funding

  1. National Funds for Distinguished Young Scientists [61825503]
  2. National Natural Science Foundation of China [62075101, 21701087, 61775101]
  3. National Program for Support of Top-Notch Young Professionals
  4. Postgraduate Research & Practice Innovation Program of Jiangsu Province [46030CX18010]

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Organic room-temperature persistent phosphorescent materials have promising optical properties, but face challenges in achieving high-quality patterns over large areas. By preparing quaternary phosphonium salts with different alkyl chains, interesting persistent phosphorescent properties can be demonstrated, with variations in lifetime range.
Organic persistent room-temperature phosphorescent (RTP) materials are promising for applications requiring the secure recording and anti-counterfeiting features owing to their appealing optical properties. Several critical challenges, such as the difficulty to obtain high-quality patterns over large areas and low security levels, need to be addressed to meet the requirements for commercial purpose. Here, we prepared a series of quaternary phosphonium salts with different alkyl chains, which showed interesting organic persistent RTP. The ionic characteristics and the alkyl chains of these molecules impart abundant weak intermolecular interactions. This confers the molecules a high crystallinity, which helps to preserve the persistent RTP properties and cover large areas. Moreover, the RTP lifetime of these organic salts varies over a wide range (1.27 to 884.71 ms) and can be tuned by simply changing the alkyl chain length and counterions, which opens new possibilities in multi-level information encryption applications. It is believed that the engineering of organic salts with tunable persistent RTP lifetimes and large-area printing can promote early-stage demonstrations of security applications into mature commercialization.

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