Phys.org December 10, 2020
In carbon dots multi-wavelength emission can be stimulated under a single excitation source, enabling the simple and robust generation of white light from a single particle. Carbon dots also exhibit a concentration-dependent photoluminescence; however, this has not been fully understood. To understand this phenomenon and fully utilize the capabilities of carbon dots, researchers in South Korea posited and demonstrated that the dual-color-emissiveness is due to the interparticle distances between each carbon dot. They examined how the relative light intensity of the red and blue colors changed when varying the interparticle distances. They found that as the concentration was adjusted, the light emitted from the carbon dots would transform; by varying the concentration, they were able to control the relative intensity of the colors, as well as emit them simultaneously to generate a white light from a single source. The discovery provides new ways to develop lighting and display solutions as well as more precise detection and sensing in instruments…read more. TECHNICAL ARTICLE
…Blue- and red-emissions show different contributions with different interparticle distances. Credit: The Korea Advanced Institute of Science and Technology (KAIST)