The one- and two-photon luminescence of stilbene-type solid-state materials can be tuned and controlled from blue to yellow color by a supramolecular cocrystal method.

Tuning and controlling the luminescent properties of molecular materials by changing the orientation and arrangement of the fluorophores within a solid has played an important role in realizing multi-color emission. The formation of polymorphs and multi-component molecular solids have attracted considerable interest as new ways of achieving controllable luminescence and other photophysical properties for application in the next generation of photofunctional materials. In this article, recent advances in the synthesis of fluorescent polymorphs and multi-component materials and potential photo-related applications of the resulting materials are described. We first review the methods of preparation of polymorphs with tunable static luminescence, and the switching of the dynamic luminescence between polymorphs for potential sensor applications is also introduced. Attention is then focused on the supramolecular design (making use of hydrogen bonding and halogen bonding interactions) and methods of fabrication of multi-component molecular solids, and their color-tunable fluorescence and phosphorescence together with their stimuli-responsive properties for use as sensors.The use of density functional theory to study intramolecular and intermolecular energy transfer as well as the electronic structures of multi-component molecular solids is also outlined. Finally, we briefly discuss perspectives for the further development of these luminescent molecular solid-state materials. Dongpeng Yan obtained hisPhD degree under the supervision of Prof. Xue Duan at Beijing University of Chemical Technology (BUCT) in 2012, In 2011, as a visiting student, he studied at the Department of Chemistry, University of Cambridge under Prof. William Jones. Now he is an associate professor at BUCT. His main research topics are experimental and computer simulation studies of organic photofunctional crystals and new layered materials. He was received an Award Nomination of Annual Figure among Chinese University Students (2011), a "Talent Model" Award in the Universities in Beijing (2010), the Tang Aoqing Chemical Scholarship (2011), and many other awards. David G. Evans studied as both undergraduate and research student at Jesus College, Oxford and obtained a DPhil under the supervision of Prof. D. M. P. Mingos FRS. Aer postdoctoral work at Bristol University with Prof. F. G. A. Stone FRS, he was appointed to a lectureship at Exeter University in 1985. Several visits to Chinese university chemistry departments in the early 1990s convinced him of China's great potential for development in this area and he moved to Beijing University of Chemical Technology in 1996. His research interests focus on intercalation in layered solids. He was awarded an International Scientic and Technological Cooperation Award of the People's Republic of China in 2005.

We report that two types of Zn-terephthalate (TPA) MOFs (namely [Zn(TPA)(DMF)] (1-DMF) and MOF-5) could exhibit an obvious room-temperature afterglow emission with a time-resolved luminescence lifetime as high as 0.47 seconds.