Imagine pouring together two cups of warm water and somehow ending up with a cup of boiling water. That cannot happen in everyday life, but at the quantum level, something similar is possible. Multiple low-energy particles of light can combine their energy to create a single particle with much higher energy.
Researchers at Kyushu University have now created a solid-state molecular material capable of converting visible sunlight into ultraviolet (UV) light under normal outdoor conditions. The new material achieves a photo upconversion efficiency of 1.9%, according to a study published June 23 in Nature Communications.
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