  Visibly transparent luminescent solar concentrators (TLSCs) can optimize both
power production and visible transparency by selectively harvesting the
invisible portion of the solar spectrum. Since the primary applications of
TLSCs include building envelopes, greenhouses, automobiles, signage, and mobile
electronics, maintaining aesthetics and functionalities is as important as
achieving high power conversion efficiencies (PCEs) in practical deployment. In
this work, we combine massive-downshifting phosphorescent nanoclusters and
fluorescent organic molecules into a TLSC system as ultraviolet (UV) and
near-infrared (NIR) selective-harvesting luminophores, respectively,
demonstrating UV and NIR dual-band selective-harvesting TLSCs with PCE over 3%,
average visible transmittance (AVT) exceeding 75% and color metrics suitable
for the window industry. With distinct wavelength-selectivity and effective
utilization of the invisible portion of the solar spectrum, this work reports
the highest light utilization efficiency (PCE x AVT) of 2.6 for a TLSC system,
the highest PCE of any transparent photovoltaic device with AVT greater than
70%, and outperforms the practical limit for non-wavelength-selective
transparent photovoltaics.
