Titanium Dioxide/Upconversion Nanoparticles/Cadmium Sulfide Nanofibers Enable Enhanced Full‐Spectrum Absorption for Superior Solar Light Driven Photocatalysis

Abstract In this work, we demonstrate an electrospinning technique to fabricate TiO 2 /upconversion nanoparticles (UCNPs)/CdS nanofibers on large scale. In addition, the as‐prepared TiO 2 nanofibers are incorporated with a high population of UCNPs and CdS nanospheres; this results in Förster resonance energy‐transfer configurations of the UCNPs, TiO 2 , and CdS nanospheres that are in close proximity. Hence, strong fluorescent emissions for the Tm 3+ ions including the 1 G 4 → 3 H 6 transition are efficiently transferred to TiO 2 and the CdS nanoparticles through an energy‐transfer process. The as‐prepared TiO 2 /UCNPs/CdS nanofibers exhibit full‐spectrum solar‐energy absorption and enable the efficient degradation of organic dyes by fluorescence resonance energy transfer between the UCNPs and TiO 2 (or CdS). The UCNPs/TiO 2 /CdS nanofibers may also have enhanced energy‐transfer efficiency for wide applications in solar cells, bioimaging, photodynamics, and chemotherapy.