Researchers at Rikkyo University, led by Professor Mitsui, have achieved a significant milestone in optical science by developing a technology that converts near-infrared light into visible light with record-breaking efficiency. The team utilized Gold Cluster Superatoms, specifically termed Gold Quantum Needles, as sensitizers to facilitate this process.
The technical performance is remarkable. Under excitation at eight hundred and eight nanometers, the system achieved a conversion efficiency of twenty-one point four percent. At nine hundred and thirty-six nanometers, it maintained a strong fifteen percent efficiency. The Gold Quantum Needles possess a unique property of strong near-infrared absorption while remaining transparent to the visible light spectrum. This allows them to transfer excitation energy to emitters with minimal loss.
Unlike previous technologies that required high-intensity lasers, this new method works effectively under weak polychromatic light, such as simulated sunlight. This breakthrough has profound implications for the energy sector. By integrating this technology with next-generation solar cells, such as Perovskite structures, the overall energy conversion efficiency can be significantly improved by capturing and utilizing the infrared portion of the solar spectrum that is typically wasted.
