Fig. 1. (A) Typical functional groups of organic phosphors; (B) examples and fundamental structures of boron-containing materials; (C) molecular structures and their interconversions in the main research. Detailed structures of (A–C) are shown in Fig S1–S3.† (D) An illustration of the achievement of RTP from free molecules in solution, immobilized molecules embedded in a polymer host and a molecular cluster, and their corresponding energy levels; (E) a summary of the potential practical applications of our work, OAlk: OH, EtO, PrO, BuO; X: H, F, Cl, Br, I.