Enhanced Luminescence by SPR-Induced Hot Electron Injection in Hybrid Au and Ga₂O₃:Ni Nanoglass Ceramics

Abstract

Hybrid noble metal (NM)−dielectric nanocrystal (NC) system has been widely used in nanophotonics, with the behavior of surface plasmon resonance (SPR) of NM yet to be explored. Herein, we fabricated Ni 2+ -doped transparent nanoglass ceramics (GCs) containing Au/Ga 2 O 3 :Ni dielectric NCs based on unique phase separation and spontaneous formation of Au nanoparticles (NPs) in a gallosilicate glass. The excitation of Au NPs leads to the injection of hot electrons into nearby NCs, which is evidenced by transient absorption spectroscopy and enhances the corresponding photoluminescence beyond Au SPR absorption. With the SPR interaction at the interface of Au/Ga 2 O 3 :Ni hybrid NCs, the photoluminescence can be enhanced by 2.8 times. Our finding suggests the utilization of SPR-induced hot electron injection through efficient "light/energy harvesting" in NM−NC GC systems for potential photonic applications.

Ag Nanoparticle-Decorated GaN/β-Ga2O3 Core–Shell Nanowires as Catalysts for Highly Efficient CO2-to-CO Photocatalytic Conversion

“…33 Under 460 nm blue light (the absorption band of Ag NPs), the LSPR in Ag NPs is excited. 34,35 When the energy is transferred to Ag NPs, hot electrons are excited and can subsequently be transferred from Ag NPs to the conduction band of β-Ga 2 O 3 , thus enhancing the photocurrent (Figure S7b). Figure S8 shows the PL spectra of different photocatalysts at an excitation wavelength of 200 nm.…”

“…Under 255 nm incident light, the enhanced photocurrent of Ag NP/GaN@β-Ga 2 O 3 NWs may be attributed to the enhanced scattering of 255 nm light by Ag NPs, causing the incident light to scatter on the β-Ga 2 O 3 shell, thereby generating more photogenerated carriers (Figure S7a). Under 460 nm blue light (the absorption band of Ag NPs), the LSPR in Ag NPs is excited. , When the energy is transferred to Ag NPs, hot electrons are excited and can subsequently be transferred from Ag NPs to the conduction band of β-Ga 2 O 3 , thus enhancing the photocurrent (Figure S7b). Figure S8 shows the PL spectra of different photocatalysts at an excitation wavelength of 200 nm.…”