Russian physicists with their colleagues from Europe have learned to generate quasiparticles—excitons, which were fully controllable and able to record information at room temperature. These particles act as a transitional form between photons and electrons, so the researchers believe they can be used to create compact optoelectronic devices for rapid recording and processing of optical signals. The proposed method is based on use of a special class of materials called metal-organic frameworks. The researchers published their results in Advanced Materials.