Ultraviolet
B (UVB) irradiation is of great importance for photochemical
synthesis of steroidal intermediates, which could be efficiently provided
by neither traditional mercury lamps nor novel light-emitting diodes.
Herein, a photochemical microfluidic strategy with enhanced UVB irradiation
was developed by the integration of novel photoluminescent composite
films, which were readily prepared to shift the emission peak. The
UVB emission intensity was increased by approximately 10 times for
an 8 W lamp with this flexible and removable film. It allowed a productivity
as high as that of a 100 W lamp without using any cooling devices,
showing great potential to replace traditional medium-pressure mercury
lamps for UVB-irradiated synthesis. In addition, a calculation method
was developed to assess the effect of specific wavelengths based on
the photon flux and photonic efficiency, which could provide theoretical
guidance for photochemical microfluidic processes to refine the emission
ranges.
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