In the late 1980s, key breakthroughs in GaN epitaxial growth and p-type doping ushered in the modern era of GaN-based optoelectronic devices. Building upon this foundation, <answer>Dr. Moustakas</answer> at Boston University patented a method for producing high-brightness blue LEDs using a new two-step process. Two years later, in 1993, high-brightness blue LEDs were demonstrated again by Shuji Nakamura of Nichia Corporation using a gallium nitride growth process similar to <answer>Dr. Moustakas</answer>'s. Both <answer>Dr. Moustakas</answer> and Mr. Nakamura were issued separate patents, which confused the issue of who was the original inventor (partly because although <answer>Dr. Moustakas</answer> invented his first, Dr. Nakamura filed first).[citation needed] This new development revolutionized LED lighting, making high-power blue light sources practical, leading to the development of technologies like BlueRay, as well as allowing the bright high resolution screens of modern tablets and phones.[citation needed]
Who first invented a method to produce high-brightness blue LEDs?
Dr. Moustakas