Evidence for triplet-state-dominated luminescence in biicosahedral superatomic molecular Au25 clusters. Issue 22 (26th April 2022)

• Record Type: Journal Article
• Authors: Mitsui, Masaaki; Wada, Yuki; Kishii, Ryoto; Arima, Daichi; Niihori, Yoshiki
• Is Part Of: Nanoscale. Volume 14:Issue 22(2022)
• Page Start: 7974
• Page End: 7979
• Publication Date: 2022-04-26
• Subjects: Nanoscience -- Periodicals; Nanotechnology -- Periodicals; 620.505
• DOI: 10.1039/d2nr00813k
• Languages: English
• ISSNs: 2040-3364

Abstract

Abstract : Biicosahedral Au25 clusters exhibit room-temperature phosphorescence from the excited triplet state with an intersystem crossing quantum yield of almost 100%. This property allows triplet sensitization and induces triplet fusion photon upconversion. Abstract : In photoluminescence (PL) quenching and triplet fusion upconversion experiments with fluorescent organic-molecule quenchers, it was revealed that a rod-shaped, phosphine- and thiolate-protected biicosahedral Au25 cluster (a representative di-superatomic molecule) exhibits only phosphorescence, not fluorescence, at room temperature with an intersystem crossing quantum yield of almost 100%. By virtue of these photophysical properties, this cluster can be used as a triplet sensitizer that undergoes direct singlet–triplet transitions in the near-infrared (NIR) region (730–900 nm), inducing photon upconversion from NIR to visible light.