Time‐Dependent Color‐Changing Room‐Temperature Phosphorescence Materials with Mutual Achievement between Guest and Host Molecules

Host‐guest doping strategy has gradually become the mainstream in constructing organic room‐temperature phosphorescence (RTP) materials. The two‐component doped system typically emits monochromatic phosphorescence dominated by the guest molecule, which also means that the intrinsic phosphorescence emission of the host molecule is not well utilized. In this work, a time‐dependent color‐changing RTP material is constructed based on host‐guest doped system, in which the initial yellow phosphorescence stems from the isoquinoline‐pyrazole guest and the final cyan phosphorescence originates from the intrinsic emission of the polymer host. The phenomenon of the strong interaction between host and guest molecules leading to their respective intrinsic phosphorescence provides new design inspiration for designing and developing two‐component doped materials with RTP properties of color variation over time.