Light-emitting diodes (LEDs) and laser diodes (LDs) have been attracting much attention for the application to solid-state lighting. In order to meet the rapid increase in the application fields, the discussion opportunities between the device developers and material scientists are required. We are pleased to announce that the 5th International Conference on Light-Emitting Devices and Their Industrial Applications (LEDIA '17) will be held at Pacifico Yokohama, Kanagawa, Japan, on April 19 - 21, 2017. LEDIA ’17 provides a platform for scientists and engineers to discuss progress and future trends in the rapidly advancing science and technology of wide bandgap semiconductors for LEDs and their applications. Their applications into visible and ultraviolet LEDs and LDs are also included in the scope of this meeting. LEDIA ’17 is sponsored by Akasaki Research Center (ARC), Nagoya University.