The phosphorescence nanocomposite thin film with rich oxygen vacancy:Towards sensitive oxygen sensor

Organic room temperature phosphorescent(ORTP)materials provide an exciting research direction for phosphorescent oxygen(O_(2)) sensors due to their high sensitivity and rapid response to O_(2).However,most pure ORTP materials are tightly-packed aromatic compound crystals in a face-to-face manner,which largely prohibits effective O_(2) diffusion for sensing.Thus,how to solve this contradiction still faces huge challenges.Here,the use of organic phosphorescent indicator carbon dots(CDs),inorganic matrix layered double hydroxides(LDHs)and polymers(PVA)successfully prepared an ultra-long RTP composite film whose phosphorescence decay intensity is linearly related to O_(2) concentration.More importantly,the use of the abundant O_(2) defects(Vo)on the surface of the inorganic matrix LDHs to adsorb O_(2),which further accelerates the phosphorescence quenching of the thin film and improves the O_(2) response.This strategy will provide the possibility to develop high-sensitivity phosphorescent O_(2) sensors from a new perspective.