Location History:
- Tokyo, JP (1999 - 2015)
- Machida, JP (2015 - 2017)
- Fukuoka, JP (2017 - 2021)
- Omuta, JP (2019 - 2021)
Company Filing History:
11 out of 2,253 
8 out of 355 
3 out of 475 Years Active: 1999-2021
Title: Innovations of Masayoshi Ichikawa: A Pioneer in Fluoride Phosphors
Introduction
Masayoshi Ichikawa, located in Tokyo, Japan, is a distinguished inventor known for his significant contributions to the field of materials science, particularly in developing fluoride phosphors. With an impressive portfolio of 23 patents, Ichikawa has been at the forefront of innovations that enhance lighting technologies.
Latest Patents
Ichikawa’s latest patents include a highly efficient fluoride phosphor and a light-emitting device utilizing the same. This innovative fluoride phosphor is characterized by a general formula (1) and demonstrates excellent external quantum efficiency, making it suitable for the stable production of white LEDs. The composition is represented as AMF:Mn(1), where the element A comprises one or more alkali metal elements including at least potassium. Meanwhile, the element M includes a simple substance of silicon or germanium or a combination of silicon with various elements such as germanium, tin, titanium, zirconium, and hafnium. The fluoride phosphor also features a repose angle between 30° to 60°, a bulk density of 0.80 g/cm³ or more, and a mass median diameter (D50) of 30 µm or less.
Career Highlights
Throughout his career, Masayoshi Ichikawa has made significant strides in the electronics and materials industries. He has played key roles in leading companies such as Advantest Corporation and Denka Company Limited, wherein he has applied his innovations to strengthen product offerings and enhance technological capabilities.
Collaborations
Ichikawa has collaborated with talented professionals in the field, including Hideyuki Emoto and Takahiro Yamaguchi. Their combined expertise has contributed to advancements in materials research and the development of groundbreaking technologies in light-emitting devices.
Conclusion
Masayoshi Ichikawa's work exemplifies the spirit of innovation. His developments in fluoride phosphors not only push the boundaries of existing technology but also pave the way for future advancements in LED lighting solutions. With a solid track record and continuous pursuit of excellence, Ichikawa remains a key figure in the world of materials and invention.