磷光
加密
无定形固体
荧光粉
材料科学
计算机科学
纳米技术
光电子学
计算机安全
化学
物理
光学
有机化学
荧光
作者
Yan Kuin Su,Soo Zeng Fiona Phua,Youbing Li,Xianju Zhou,Deblin Jana,Guofeng Li,Wei Qi Lim,Wee Kong Ong,Chaolong Yang,Yanli Zhao
出处
期刊:Science Advances
[American Association for the Advancement of Science (AAAS)]
日期:2018-05-04
卷期号:4 (5)
被引量:524
标识
DOI:10.1126/sciadv.aas9732
摘要
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.
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