Organic Room‐Temperature Phosphorescence Aerogels With Mechanical Toughness and Flame‐Retardance

ABSTRACT Gel‐based room‐temperature phosphorescence (RTP) materials have garnered significant attention due to their promising applications in flexible electronics and photonics. However, the inherent swollen state and porous architecture of such gels often promote intense molecular motion and facilitate oxygen diffusion, which can severely quench phosphorescence under ambient conditions. In this work, we report a versatile strategy for constructing high‐performance organic RTP materials by leveraging organic aerogels, which exhibit superior luminescent, mechanical, and thermal properties. Owing to their structural advantages, these organic aerogels possess a three‐dimensional rigid framework that enhances intersystem crossing (ISC) efficiency and promotes multiple intermolecular interactions, thereby enabling efficient RTP with an ultralong phosphorescent lifetime of up to 1007 ms. Notably, the resulting RTP aerogels demonstrate exceptional structural robustness (compression modulus of 1 MPa), excellent thermal insulation (peak heat release rate reduced to 31.1 kW/m 2 ), and outstanding flame retardancy (limiting oxygen index exceeding 90%), positioning them among the most multifunctional organic aerogels reported to date. Given their balanced combination of RTP performance, mechanical resilience, and thermal stability, these phosphorescent aerogels represent a highly promising platform for the development of advanced, multifunctional organic RTP materials.