Research ArticleChemistry

Ultrabright Au@Cu14 nanoclusters: 71.3% phosphorescence quantum yield in non-degassed solution at room temperature

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Science Advances  06 Jan 2021:
Vol. 7, no. 2, eabd2091
DOI: 10.1126/sciadv.abd2091
  • Fig. 1 Structure analysis of [AuCu14(SR)12(BCPP)6]+.

    (A) Total structure, (B) the Cu14(SR)12(BCPP)6 cage, (C) the Cu(SR)2(BCPP) mount motif capping on the square face of the Cu8 cube, and (D) the body-centered cubic Au@Cu8. Color codes: magenta, Au; brown, octahedral Cu atoms; green, cubic Cu atoms; yellow, S; orange, P; gray, C; light blue, N; white, H.

  • Fig. 2 Optical properties of Au@Cu14.

    (A) Excitation (black, λem = 625 nm) and emission (red, blue, magenta, excited at different wavelengths as indicated by horizontal dashed lines) spectra of Au@Cu14 in ambient CH2Cl2 solution. Inset: Photos of Au@Cu14 solutions under room light (left) and 365-nm UV irradiation (right), respectively. (B) The emission spectrum of Au@Cu14 in solid state (λex = 410 nm). Inset: Photos of Au@Cu14 solids under room light (left) and 365-nm UV irradiation (right), respectively. (C) The temperature-dependent emission spectra of Au@Cu14 in solid state (λex = 410 nm). a.u., arbitrary units.

  • Fig. 3 Effect of the central single gold atom.

    (A) Comparison of the emission spectra of CH2Cl2 solutions of Au@Cu14 (blue), X@Cu14 (X = Au/Cl, green), and Cl@Cu14 (purple) NCs (λex = 410 nm); (B) the plot of PLQY versus the atomic ratio of Au:(Au + Cl).

  • Fig. 4 1O2 generation.

    (A) Comparison of the emission spectra of CH2Cl2 solutions of Au@Cu14 under ambient condition (blue), N2-purged (black), O2-saturated (red), and rhodamine B (magenta) as reference, λex = 410 nm; (B) near-infrared PL of N2-purged (black) and O2-saturated (red) CH2Cl2 solution of Au@Cu14, λex = 410 nm; (C) Overlapped UV-vis spectra of N2-purged (black) and O2-saturated (red) CH2Cl2 solution of Au@Cu14.

  • Fig. 5 Transient absorption.

    (A) TA spectra of Au@Cu14 at three different time delays (pumped at 400 nm); (B) TA kinetics decay probed at selected wavelengths; (C) the microsecond PL decay traces of Au@Cu14. Solvent: CH2Cl2. (D) Schematic diagram showing the excited-state relaxation dynamics of Au@Cu14 and energy transfer between its excited-state and triplet oxygen molecules.

Supplementary Materials

  • Supplementary Materials

    Ultrabright Au@Cu14 nanoclusters: 71.3% phosphorescence quantum yield in non-degassed solution at room temperature

    Yongbo Song, Yingwei Li, Meng Zhou, Xuan Liu, Hao Li, He Wang, Yuhua Shen, Manzhou Zhu, Rongchao Jin

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