1 research outputs found
Near-Ultraviolet to Near-Infrared Fluorescent Nitrogen-Doped Carbon Dots with Two-Photon and Piezochromic Luminescence
Carbon
dots (CDs) have gained intensive interests owing to their
unique structure and excellent optoelectronic performances. However,
to acquire CDs with a broadband emission spectrum still remains an
issue. In this work, nitrogen-doped CDs (N-CDs) with near-ultraviolet
(NUV), visible, and near-infrared (NIR) emission were synthesized
via one-pot solvothermal strategy, and the excitation-independent
NUV and NIR emission and excitation-dependent visible emission were
observed in the photoluminescence (PL) spectra of N-CDs. Moreover,
the as-synthesized N-CDs displayed two-photon fluorescence emission.
It is important to note that N-CDs also exhibited piezochromic luminescence
with reversibility, in which the red- and blue-shifted PL with increasing
applied pressure (0.07–5.18 GPa) and the red- and blue-shifted
PL with releasing applied pressure (5.18 GPa to 1 atm) were developed
for the first time. Combined with good hydrophilicity, high photobleaching
resistance, and low toxicity, the piezochromic luminescence would
greatly boost the valuable applications of N-CDs