Despite many Eu2+‐doped phosphors having been synthesized by different methods, a simple synthetic strategy for Eu2+‐doped high‐performance phosphors remains one of the significant challenges for phosphor‐conversion white light‐emitting diodes. Herein, a novel broad‐band excitation yellow phosphor Ba0.985Al4Sb2O12:0.015Eu2+ (BASO:Eu2+) with high thermal stability (423 K, 94%) and internal quantum efficiency (96.7%) are reported. More importantly, the novel phosphor is synthesized by solid‐state reaction at high temperatures in air. Structural and spectral analyses show that the Eu2+ ions in BASO preferably occupy [BaO8] hexahedra, forming a single luminescence center. This study provides a reliable direction for the facile synthesis of high‐performance Eu2+‐doped phosphors in air.
Exploring cost-effective catalysts with high catalytic performance and long-term stability has always been a general concern for environment protection and energy conversion. Here, Au nanoparticles (NPs) embedded CuO x-CeO 2 core/shell nanospheres (Au@CuO x-CeO 2 CSNs) have been successfully prepared through a versatile one-pot method at ambient conditions. The spontaneous auto-redox reaction between HAuCl 4 and Ce(OH) 3 in aqueous solution triggered the self-assembly growth of micro-/ nanostructural Au@CuO x-CeO 2 CSNs. Meanwhile, the CuO x clusters in Au@CuO x-CeO 2 CSNs are capable of improving the anti-sintering ability of Au NPs and providing synergistic catalysis benefits. As a result, the confined Au NPs exhibited extraordinary thermal stability even at a harsh thermal condition up to 700 C. In addition, before and after the severe calcination process, Au@CuO x-CeO 2 CSNs can exhibit enhanced catalytic activity and excellent recyclability towards the hydrogenation of p-nitrophenol compared to previously reported nanocatalysts. The synergistic catalysis path between Au/CuO x /CeO 2 triphasic interfaces was revealed by density functional theory (DFT) calculations. The CuO x clusters around the embedded Au NPs can provide moderate adsorption strength of p-nitrophenol, while the adjacent CeO 2-supported Au NPs can facilitate the hydrogen dissociation to form H* species, which contributes to achieve the efficient reduction of p-nitrophenol. This study opens up new possibilities for developing high-efficient and sintering-resistant micro-/nanostructural nanocatalysts by exploiting multiphasic systems.
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