Boric Acid Cross-Linking Strategy for Enhancing Room Temperature Phosphorescence of Poly(Vinyl Alcohol)-Doped Films
Yejun Yao, Die Huang, Pengbo Han, Xiaoluo Peng, Xin He, He Xu, Anjun Qin, Ben Zhong Tang
Abstract
Organic room temperature phosphorescence (RTP) has attracted increasing attention owing to its unique luminous properties and wide applications. However, the trade-off between the phosphorescence quantum yield (Φ Phos ) and the phosphorescence lifetime (τ Phos ) highlights the necessity for developing new strategies to enhance RTP performance. While research often focuses on guest components in polymer-based host–guest RTP systems, the host materials, which provide rigid environments, are less explored. This work introduces a simple and efficient strategy to develop RTP materials with high efficiency and long lifetime by employing covalent cross-linking to modify the rigidity of the polymer matrix. By suppressing nonradiative decay and decreasing luminescence quenching under ambient conditions, not only the Φ Phos of cross-linked films is improved from 3.2% to 13.5%, but also the τ Phos is extended from 482.34 to 625.23 ms. Thanks to its solution processability and water sensitivity, this RTP system was successfully applied in inkjet printing and binary anticounterfeiting.