New Phenothiazine Derivatives That Exhibit Photoinduced Room‐Temperature Phosphorescence

Abstract The research of purely organic room‐temperature phosphorescence (RTP) materials with stimulus response characteristic has drawn increasing attention for their broad application prospects. However, these kinds of materials are really scarce now, especially for those with efficient RTP emissions, which have largely limited their practical applications. Here, an all‐around‐type player in the field of photoinduced phosphorescence material appears, whose RTP efficiency can increase from near 0 to 22% after continuous UV irradiation. Correspondingly, the UV‐written patterns based on them can be clearly observed by the naked eye in daytime or even under sunlight. Moreover, these materials are found to show excellent photostability, and the strong RTP emission can still be observed after repeated activation for more than 50 times. The high RTP efficiency and good photostability make these photoinduced RTP materials exhibit an attractive prospect for potential applications in many fields, including leak test, microcrack detection, programmable information storage, and encryption.