Photoluminescence (PL) Emission and Carrier Recombination in Photocatalysts

The grammar in the given text is correct. PL emission originates from the energy dissipation in the carrier recombination process, so PL could evaluate the separation efficiency of photogenerated electron-hole pairs in photocatalysts. The relative weak PL intensity indicates a low recombination rate of the photoinduced carriers. As shown in Fig. 8a, the pure BMO and other X% BMO/BOCI composites both show PL emission peak at 580 nm, but 6:4 BMO/BOCI samples display higher intensity than that of BMO. The reason for this phenomenon is that 6:4 BMO/BOCI has a higher light absorption capacity and the transfer of electrons to BOCI in the presence of a built-in electric field results in a higher electron-hole pairing efficiency in 6:4 BMO-BOCI than in the original BMO, but the degradation efficiency of TC in 6:4 BMO-BOCI is still higher than in the original sample due to the reduced band gap and light absorption capacity of the sample increased, resulting in more electron-hole pairs for the photocatalytic process.