Professor Nobuo Kimizuka of Kyushu University and others have succeeded in streamlining up-conversion with sunlight.It is a technology that enhances the quality of the energy of light, and even light that cannot be used for power generation with solar cells such as infrared rays can be converted into light suitable for power generation such as visible light and ultraviolet rays.Infrared rays account for as much as 50% of sunlight, which is expected to significantly improve power generation efficiency.

 Until now, only a very powerful laser could cause up-conversion.By absorbing light, a substance can store its energy inside for a short time.The stored energy is emitted as light again over time, but if the light is applied again and more energy is added before that, the emitted light will be stronger.Unfortunately, up-conversion has traditionally been said to rarely occur unless the light is more than 1000 times stronger than the sun's rays.
 In this research, instead of shining a second light on a molecule that has stored energy by shining light once, we aimed to store high energy in one molecule by colliding them and transferring energy.The key was how to efficiently transfer energy between molecules, but this was made possible by regularly arranging the molecules in crystals with innumerable pores.In this way, we succeeded for the first time in the world in up-conversion with light as weak as sunlight.

 The up-conversion technology developed this time will be a breakthrough for more efficient use of sunlight, which was previously thought to be used for power generation only about half, no matter how efficient it is.Furthermore, since this method can be incorporated into plastic, it is thought that it can be applied to solar cells that can be bent in the future.

Source:[Kyushu University] The world's first successful development of a solid material that maximizes photon upconversion efficiency even with weak sunlight!

Kyushu University

A university that creates "comprehensive knowledge" that opens up the future and drives social change

Kyushu University, which celebrated its 111th anniversary this year, is a core university with 12 faculties and 19 faculties.We have been designated as a "designated national university corporation" that can be an international base by developing the world's highest level of outstanding education and research activities.From the humanities and sociology that we have cultivated so far to the natural sciences, and even the design-related "knowledge" […]

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