Compared with inorganic long‐lasting luminescent materials, organic room temperature phosphorescent (RTP) ones show several advantages, such as flexibility, transparency, solubility and color adjustability. However, organic RTP materials close to commercialization are still to be developed. In this work, we developed a new host–guest doping system with stimulus‐responsive RTP characteristics, in which triphenylphosphine oxide (OPph3) acted host and benzo(dibenzo)phenothiazine dioxide derivatives as guests. Turn‐on RTP effect was realized by mixing them together through co‐crystallization or grinding, in which the efficient energy transfer from host to guest and the strong intersystem crossing (ISC) ability of the guest have played significant role. Further on, multistage stimulus‐responsive RTP characteristics from grinding to chemical stimulus were achieved via introducing pyridine group into the guest molecule. In addition, the anti‐counterfeiting printings were realized for these materials through various methods, including stylus printing, thermal printing and inkjet printing, which brings RTP materials closer to commercialization.

Room temperature phosphorescence (RTP) luminogens have attracted much attention because of their wide applications in chemical sensors, bio-imaging and anti-counterfeiting technology etc. However, these luminogens are still very scarce, especially...

The research of purely organic room-temperature phosphorescence (RTP) materials has drawn great attention for their wide potential applications. Besides single-component and host-guest doping systems, the self-doping with same molecule but different conformations in one state is also a possible way to construct RTP materials, regardless of its rare investigation. In this work, twenty-four phenothiazine derivatives with two distinct molecular conformations were designed and their RTP behaviors in different states were systematically studied, with the aim to deeply understand the selfdoping effect on the corresponding RTP property. While the phenothiazine derivatives with quasi-axial (ax) conformation presented better RTP performance in aggregated state, the quasi-equatorial (eq) ones were better in isolated state. Accordingly, the much promoted RTP performance was achieved in the stimulated selfdoping state with ax-conformer as host and eq-one as guest, demonstrating the significant influence of selfdoping on RTP effect.

Pure organic extrinsically porous molecular crystals (EPMCs) PBO-1 constructed via pure C–H⋯π bonds have vapor-induced crystal-to-crystal transformation capabilities, which allows them to realize the adsorption and desorption of toluene.

The development of multifunctional luminescent materials is of great importance but really difficult, since different luminescent properties have different requirements for molecular structure. Herein, a universal platform of exciplex was...