Visible Light-Activated Phosphorescence Systems Co-Assembled by Phenanthroline-Based Molecules with Polyvinyl Alcohol

Abstract

Developing pure organic room-temperature phosphorescence(RTP) materials with visible light activation has drawn widespread attention. In this work, a visible light-activated RTP design strategy was developed by incorporating the phenanthroline-based donor-acceptor(D-A) phosphor into a rigid polymer matrix polyvinyl alcohol(PVA). Phenanthroline with rich heteroatom N can promote the generation of triplet excitons and form abundant hydrogen bonds with PVA, inhibiting the non-radiative relaxation and thereby leading to phosphorescence. Upon irradiation with 420 nm visible light, the phosphorescence color of these doped PVA films can be shifted from green to yellow by regulating the molecular conjugated structure and D-A interaction. Based on the phosphorescence properties, these doped PVA films can be used for information encryption. This work offers a simple and feasible approach for constructing visible light-activated phosphorescence materials with excellent application prospects in information encryption, sensors and other fields.

Keywords

phosphorescence / phenanthroline / visible light / polymer system

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Funding

Shanghai Pujiang Program of China(20PJ1400500)

International Cooperation Fund of Science and Technology Commission of Shanghai Municipality, China(21130750100)

Fundamental Research Funds for the Central Universities, China(2232022A-03)