Enhanced up-conversion photoluminescence in fluoride–oxyfluoride nanophosphor films by embedding gold nanoparticles

Abstract

Owning to their unique non-linear optical character, lanthanide-based up-converting materials are potentially interesting for a wide variety of fields ranging from biomedicine to light harvesting. However, their poor luminescent efficiency...

Plasmon-Enhanced Photocatalytic Oxidation of Benzyl Alcohol to Benzaldehyde Using BiVO4/BiOBr/Au Nanosheets

“…00-001-1172 (Supporting Information, Figure S1). 37 The intensity of the Au peaks increases with increasing gold content; however, the Au peaks in the 0.5% sample can be barely seen because the gold content is too low to be detected via XRD analysis. Moreover, there are no peaks observed for gold oxide nanoparticles indicating that all the gold particles formed on the surface of BiVO 4 /BiOBr are Au nanodomains.…”

“…The patterns of the BiVO 4 /BiOBr/Au samples show an additional peak at 38.2° that corresponds to the (111) plane of cubic gold nanoparticles (Figure a) according to JCPDS no. 00-001-1172 (Supporting Information, Figure S1) . The intensity of the Au peaks increases with increasing gold content; however, the Au peaks in the 0.5% sample can be barely seen because the gold content is too low to be detected via XRD analysis.…”

Enhancement of upconversion photoluminescence in phosphor nanoparticle thin films using metallic nanoantennas fabricated by colloidal lithography

“…To study the effect of the LSPR supported by the nanoantennas on the emission properties of UCNPs, we use a 980 nm laser, which coincides with the 2 F 7/2 to 2 F 5/2 transition of Yb 3+ ions. 31,47 Upon excitation, 980 nm light is absorbed by Yb 3+ and energy is transferred to Er 3+ , resulting in green and red emission see Fig. 3a.…”

“…Although the UCPL follows a quadratic dependence (see Fig. S6, ESI †), 31,47,53,54 a slight reduction of the slope is observed in the presence of the metal nanoparticles, since the LSPR accelerates the energy transfer from the 2 F 5/2 energy level of the Yb 3+ sensitizers to the 4 I 11/2 of the Er 3+ emitters. 31 In addition, the UCPL enhancement decreases with the excitation power density.…”

“…26 Indeed, Ag nanocavities or gold NPs supporting an LSPR mode overlapping with the emission of UCNPs have enabled an enhancement of the radiative decay rate, thereby improving the UCPL intensity. 31,32 It has also been shown that metallic nanostructures resonant with the excitation bands of UCNPs give rise to increased UCPL due to absorption enhancement. [33][34][35] In all approaches, controlling the spectral position of the LSPRs is the key point to demonstrate UCPL enhancement.…”