Company Filing History:
5 out of 193 
2 out of 2 Years Active: 1998-2006
Title: Takefumi Ishikura: Innovator in Diamond Ultraviolet Light-Emitting Devices
Introduction
Takefumi Ishikura is a prominent inventor based in Tokyo, Japan. He has made significant contributions to the field of semiconductor technology, particularly in the development of diamond ultraviolet light-emitting devices. With a total of six patents to his name, Ishikura's work is at the forefront of innovation in this specialized area.
Latest Patents
Ishikura's latest patents include a diamond ultraviolet light-emitting device and a diamond ultraviolet luminescent element. The diamond ultraviolet light-emitting device is a compact and efficient current-injection device that utilizes a high-quality diamond grown by the chemical vapor deposition (CVD) method. This device features a surface conductive layer and electrodes, enabling it to emit free-exciton recombination radiation at a wavelength of 235 nm. The diamond ultraviolet luminescent element, on the other hand, incorporates a current-injection light-emitting diode structure. It consists of a boron-doped p-type diamond crystal and a phosphorous-doped n-type diamond crystal, both synthesized through advanced methods. The luminescence produced by this element is also centered around the 235 nm wavelength, showcasing the potential of diamond-based technologies.
Career Highlights
Throughout his career, Ishikura has worked with notable companies such as Tokyo Gas Company Limited and Tokyo Gas Chemicals Co., Ltd. His experience in these organizations has contributed to his expertise in the field of diamond technology and semiconductor devices.
Collaborations
Ishikura has collaborated with esteemed colleagues, including Satoshi Yamashita and Hiroshi Kawarada. These partnerships have further enriched his research and development efforts in the realm of diamond ultraviolet light-emitting devices.
Conclusion
Takefumi Ishikura's innovative work in diamond ultraviolet light-emitting devices positions him as a key figure in semiconductor technology. His contributions continue to pave the way for advancements in this field, demonstrating the potential of diamond materials in electronic applications.