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Title: Ultralong room temperature phosphorescence from amorphous organic materials toward confidential information encryption and decryption
Authors: Phua, Fiona Soo Zeng
Su, Yan
Li, Youbing
Zhou, Xianju
Jana, Deblin
Liu, Guofeng
Lim, Wei Qi
Ong, Wee Kong
Yang, Chaolong
Zhao, Yanli
Keywords: Ultralong Room Temperature Phosphorescence (URTP)
Amorphous Organic Molecules
Issue Date: 2018
Source: Su, Y., Phua, F. S. Z., Li, Y., Zhou, X., Jana, D., Liu, G., et al. (2018). Ultralong room temperature phosphorescence from amorphous organic materials toward confidential information encryption and decryption. Science Advances, 4(5), eaas9732-.
Series/Report no.: Science Advances
Abstract: Ultralong room temperature phosphorescence (URTP) emitted from pure amorphous organic molecules is very rare. Although a few crystalline organic molecules could realize URTP with long lifetimes (>100 ms), practical applications of these crystalline organic phosphors are still challenging because the formation and maintenance of high-quality crystals are very difficult and complicated. Herein, we present a rational design for minimizing the vibrational dissipation of pure amorphous organic molecules to achieve URTP. By using this strategy, a series of URTP films with long lifetimes and high phosphorescent quantum yields (up to 0.75 s and 11.23%, respectively) were obtained from amorphous organic phosphors without visible fluorescence and phosphorescence under ambient conditions. On the basis of the unique features of URTP films, a new green screen printing technology without using any ink was developed toward confidential information encryption and decryption. This work presents a breakthrough strategy in applying amorphous organic materials for URTP.
DOI: 10.1126/sciadv.aas9732
Schools: School of Physical and Mathematical Sciences 
Rights: © 2018 The Authors, some rights reserved; exclusive licensee American Association for the Advancement of Science. No claim to original U.S. Government Works. Distributed under a Creative Commons Attribution NonCommercial License 4.0 (CC BY-NC). This is an open-access article distributed under the terms of the Creative Commons Attribution-NonCommercial license, which permits use, distribution, and reproduction in any medium, so long as the resultant use is not for commercial advantage and provided the original work is properly cited.
Fulltext Permission: open
Fulltext Availability: With Fulltext
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