Professor Shuji NAKAMURA one of the three Japanese recipients of the 2014 Nobel Prize in Physics “for the invention of efficient blue light-emitting diodes, which has enabled bright and energy-saving white light sources” gave a lecture at Tohoku University on January 31. At the end of the talk, a Question/Answer session was held with members of the public. His invention goes back to 1993 when he succeeded in making the first high brightness blue Light-Emitting Diode (LED) based on the development of fabrication processes allowing him to mass product highly doped p-type GaN. His work led later to the first white LED and to the creation of the blue laser diode used in Blu-ray Disc Players. At the time of his invention, he was working for Nichia Corporation whom he left in 1999 to take a position as a professor at the University of California, Santa Barbara.