Company Filing History:
Years Active: 1996-2000
Title: Koichi Hasegawa: Innovator in Light-Emitting Technology
Introduction
Koichi Hasegawa is a prominent inventor based in Chichibu, Japan. He has made significant contributions to the field of light-emitting devices, holding a total of 5 patents. His work focuses on the development of advanced semiconductor technologies that enhance the efficiency and performance of light-emitting diodes.
Latest Patents
Hasegawa's latest patents include a gallium phosphide (GaP) green light-emitting device. This innovative device features an n-type GaP single-crystal substrate, which is layered with an n-type GaP layer, a nitrogen-doped n-type GaP layer, and a nitrogen-doped p-type GaP layer. The concentration of carbon and/or sulfur in the nitrogen-doped n-type GaP layers is meticulously controlled to not exceed 6.times.10.sup.15 cm.sup.-3. Additionally, he has developed an epitaxial wafer for light-emitting diodes, which consists of an n-type GaP single-crystal substrate along with n-type and p-type semiconductor epitaxial layers. The substrate is designed with a boron concentration of no more than 1.times.10.sup.17 cm.sup.-3, ensuring optimal performance for the fabricated light-emitting diodes.
Career Highlights
Hasegawa is currently employed at Showa Denko K.K., where he continues to push the boundaries of semiconductor technology. His work has been instrumental in advancing the capabilities of light-emitting devices, making them more efficient and reliable for various applications.
Collaborations
Throughout his career, Hasegawa has collaborated with notable colleagues, including Atsushi Yoshinaga and Isao Kabe. These partnerships have fostered innovation and contributed to the successful development of new technologies in the field.
Conclusion
Koichi Hasegawa's contributions to light-emitting technology exemplify his dedication to innovation and excellence. His patents and ongoing work at Showa Denko K.K. continue to influence the industry and pave the way for future advancements in semiconductor technology.