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November 10, 2015

Rengo Ready to Ship Gaiaphoton γ Samples
NEDO Grant Program Accelerated Development

Rengo Co., Ltd. (Head Office: Kita-ku, Osaka; Chairman, President & CEO: Kiyoshi Otsubo) announces it is ready to ship samples of Gaiaphoton γ (gamma), a new phosphor that does not contain any rare earth element, following the progress in its development after receiving assistance through a grant program by the New Energy and Industrial Technology Development Organization (NEDO), a national research and development agency.

Research and development of Gaiaphoton γ has already been presented at the “International Symposium on Zeolite and Microporous Crystals 2015” (held at Sapporo Convention Center from June 28 to July 2, 2015) by partner corporations and universities in the below manner.

The development of Gaiaphoton γ, a phosphor that does not contain any rare earth element yet is luminescent when exposed to visible light, was accelerated by the grant program from NEDO. Through collaboration with partner corporations and universities, Rengo has been working towards further speeding up the commercialization of Gaiaphoton γ by making use of the expertise and networks held by each partner.

Luminous intensity higher than existing phosphors has already been achieved under conditions of specific wavelength exposure. Development for a wide range of applications will continue to be advanced, not just for use in high color rendering next-generation LED lighting, but also in applications such as anti-forgery, cosmetics, sensors, daily necessities, and toys.

This achievement is planned to be presented at the NEDO booth during the “8th Light-Tech Expo” (at Tokyo Big Sight from January 13 to 15, 2016), the “30th JFCA Techno-festa” (at Hotel Mielparque Tokyo on January 25, 2016), and the “nano tech 2016” (at Tokyo Big Sight from January 27 to 29, 2016).


Development Partners

Partner corporations

Union Showa K.K.

Head office: Konan, Minato-ku, Tokyo; President: Shunji Fukuda

A subsidiary of UOP LLC (US), which was the first in the world to industrially produce zeolite, and Showa Denko K.K.; possesses deep expertise regarding zeolite, and technology to combine special zeolites.

Sinanen Zeomic Co., Ltd.

Head office: Nakagawa-honmachi, Minato-ku, Nagoya City; Representative: Toshimi Saeki

Developed and commercialized the zeolite Zeomic, the world's first silver-base inorganic antimicrobial agent, and possesses technology to add it to plastics and paints.


Partner universities

The University of Tokyo,
University of Yamanashi
Commissioned to conduct crystallography of Gaiaphoton crystals using Rietveld analysis, which employs powder X-ray diffractometry, and analysis of the state of silver within zeolite crystals using X-ray absorption microstructure analysis.


Samples of polypropylene plastics with Gaiaphoton γ added

Before UV exposure

●Before UV exposure


During UV exposure

●During UV exposure


Samples of polyethylene plastics with Gaiaphoton γ added

Before UV exposure

●Before UV exposure


During UV exposure

●During UV exposure


During purple light exposure
●During purple light exposure

*During UV or purple light exposure, the mixed Gaiaphoton γ emits orange or pink light.


Comparison of luminous intensity between Gaiaphoton and existing yellow and red phosphors (excitation wavelength: 405nm)




Union Showa K.K. Website:
Sinanen Zeomic Co., Ltd.



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