Doing photon upconversion a solid – Crystals that convert light to more useful wavelengths

Nanowerk  November 25, 2021
A promising way to realize photon upconversion (PUC) is through triplet-triplet annihilation (TTA). Researchers in Japan discovered that ANNP, a hydrocarbon molecule originally developed for blue organic LEDs, was an excellent annihilator. They mixed it with platinum octaethylporphyrin (PtOEP), a staple sensitizer that absorbs green light. They demonstrated substantial advantages of the van der Waals solid solution concept to yield molecular crystals with extraordinary performance. A 0.001%-order porphyrin sensitizer is dissolved during recrystallization into the molecular crystals of a blue-fluorescent hydrocarbon annihilator, 9-(2-naphthyl)-10-[4-(1-naphthyl)phenyl]anthracene (ANNP). The solid crystals they produced were highly stable and exhibited outstanding performance. According to the researchers the proof-of-concept they presented will open diverse photonics technologies in the future…read more. Open Access TECHNICAL ARTICLE 

Morphological and optical absorption properties of the UC crystals….Credit: RSC Materials Horizons, 2021, Advance Article. 

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