This paper presents an intrinsically polymeric room temperature phosphorescence (RTP) system with long-lived phosphorescence, high quantum yields, and multiple colors achieved through stepwise structural confinement to control triplet excitons. The phosphorescence lifetime of one polymer (9VA-B) increased by over four orders of magnitude, reaching a maximum phosphorescence quantum yield of 16.04% in halogen-free polymers. The material's sensitivity to moisture is exploited for crack detection, and its varying phosphorescence lifetimes are used for information storage via Morse code.
