High‐Performance Organic Ultralong Room Temperature Phosphorescence Based on Biomass Macrocycle

Abstract The pursuit of sustainable, high‐performance organic ultralong room temperature phosphorescence (OURTP) materials with stimulus‐responsive properties presents a significant and enticing yet formidable challenge. Herein, an efficient strategy to confining boric acid‐based compounds into biomass macrocycle γ‐cyclodextrin through multiple interactions is developed, enabling the construction of high‐performance and multicolor OURTP doped systems. The synergistic effects of strong hydrogen bonding, C─O─B covalent cross‐linking, and host–guest encapsulation significantly suppress non‐radiative transition, culminating in an extraordinary lifetime and excellent phosphorescence quantum yield of 4.65 s and 32.8%, respectively, which are far superior to reported biomass RTP materials. Additionally, merging biomass macrocycle with phosphors contributes to multiple stimulus responses, overcoming the inherent limitations of degradation and recycling of organic RTP compounds, and dynamically modulating RTP signals through multiple‐stimulus responses, achieving the integration of multifunctional dynamic data processing techniques. This work will provide a direction for new environmentally friendly and potentially commercially available stimulus‐responsive OURTP materials.