Ultralong Organic Phosphorescence of Triazatruxene Derivatives for Dynamic Data Encryption and Anti‐counterfeiting
Baoshuai Liang, Wei An, Jie Liu, Yu Dong, Shiyu Feng, Weiguo Huang
Abstract
Comprehensive Summary Organic luminogens with persistent room temperature phosphorescence (RTP) have drawn tremendous attentions due to their promising potentials in optoelectronic devices, information storage, biological imaging, and anti‐counterfeiting. In this work, six triazatruxene‐based lumiogens with different peripheral substituents and configurations are synthesized and systematically studied. The results show that their fluorescence quantum yields in solid states range from 15.73% to 37.58%. Dispersing the luminogens as guest into the host (PPh 3 ) could turn on the persistent RTP, where PPh 3 acts as not only a rigid matrix to suppress the non‐radiative transitions of the guest, but also provides energy transfer channels to the guest. The maximum phosphorescence efficiency and the longest lifetime could reach 29.35% and 0.99 s in co‐crystal films of 6‐TAT‐CN/PPh 3 and 5‐TAT‐H/PPh 3 , respectively. Moreover, these host‐guest co‐crystalline films exhibit great potentials in advanced dynamic data encryption and anti‐counterfeiting. This work deepens the insight for low cost, halogen‐free, and facile fabrication of all‐organic persistent RTP materials.