Stimulus‐Responsive Emission via Dynamic Triplet Energy Transfer in Organic Room‐Temperature Phosphorescence Glass

Abstract Dynamic organic room‐temperature phosphorescence (RTP) glasses with color tunability offer significant potential for practical applications due to their high transparency and excellent machinability. In this study, organic glasses with efficient and dynamic RTP properties are used as triplet donors, combined with commercially available chromophores as singlet/triplet acceptors, to successfully fabricate a series of host‐guest doping glasses with color‐tunable organic afterglow and dynamic responses to external stimuli. The energy transfer mechanisms, including triplet‐to‐singlet phosphorescence resonance energy transfer and Dexter‐type triplet‐to‐triplet energy transfer, are confirmed using state‐of‐the‐art femtosecond time‐resolved transient absorption spectroscopy. These organic glasses demonstrate excellent transparency, good machinability, and dynamic responsiveness to external stimuli. The study highlights their potential applications in large‐area afterglow glass fabrication, dynamic data encryption, and flexible afterglow displays. This work not only provides a simple design principle for developing novel organic glass materials with color tunability and dynamic responses but also promotes the potential applications of organic RTP materials in dynamic information encryption and flexible optoelectronics.