Location History:
- Takatsuki, JA (1976 - 1977)
- Takatsuki, JP (1978)
- Ibaraki, JP (1981 - 1990)
Company Filing History:
10 out of 27,375 
2 out of 655 
Years Active: 1976-1990
Title: Hitoo Iwasa: Innovator in Green Light Emitting Diodes
Introduction
Hitoo Iwasa is a prominent inventor based in Ibaraki, Japan. He has made significant contributions to the field of light-emitting diodes (LEDs), particularly in the development of pure green light emitting diodes. With a total of 12 patents to his name, Iwasa's work has paved the way for advancements in LED technology.
Latest Patents
Iwasa's latest patents include innovative methods for manufacturing pure green light emitting diodes. One of his notable inventions involves a pure-green light emitting diode that consists of an n-type GaP layer formed on an n-type GaP substrate, along with a p-type GaP layer created using a liquid phase epitaxial method. This method ensures that the average donor concentration of the p-type GaP layer remains less than or equal to 5×1016 cm-3. The manufacturing process utilizes a technique that maintains the melt temperature for liquid phase crystal growth at a constant level while reducing the ambient pressure. This approach effectively volatilizes donor impurities from the melt, allowing for the production of high-brightness pure-green light emitting diodes that can be easily distinguished from yellow-green variants.
Another significant patent focuses on the manufacturing process of pure green light emitting diodes. In this method, an n-type GaP epitaxial layer is grown on an n-type GaP substrate, ensuring that the dislocation density on the surface is minimized. This results in GaP green light emitting diodes that exhibit high intensity of light emission, even when using substrates with normal dislocation density.
Career Highlights
Throughout his career, Hitoo Iwasa has worked with notable companies, including Matsushita Electric Industrial Co., Ltd. and Matsushita Electronics Corporation. His experience in these organizations has contributed to his expertise in LED technology and innovation.
Collaborations
Iwasa has collaborated with esteemed colleagues such as Susumu Koike and Gota Kano. These partnerships have further enriched his research and development efforts in the field of light emitting diodes.
Conclusion
Hitoo Iwasa's contributions to the development of pure green light emitting diodes have significantly impacted the LED industry. His innovative patents and collaborative efforts
Inventor’s Patent Attorneys refers to legal professionals with specialized expertise in representing inventors throughout the patent process. These attorneys assist inventors in navigating the complexities of patent law, including filing patent applications, conducting patent searches, and protecting intellectual property rights. They play a crucial role in helping inventors secure patents for their innovative creations.