Distinguished Professor Dayong Jin joined the 4th International Workshop on Persistent and Photostimulable Phosphors 4PPP at Park Plaza Beijing Science Park. Aimed at making a combined effort to unravel the nature of persistent and photostimulable luminescent materials, the workshop covered subjects like the synthesis and development of materials with different wavebands, defect and structural characterization, dynamic energy transfer processes, simulation and models for processes such as the trapping and releasing of charge carriers and applications of materials in biomedical imaging, cancer treatment, luminescent nanomaterials and so on. It fully presented the latest and forefront development, and even in a broader sense, the field of luminescent materials. Participants further discussed the new system design, synthesis, characterisation, performance test and applications of luminescent materials, expecting to inspire new ideas and ways of thinking to solve basic scientific problems.