Enhanced UV Light Emission by Core-Shell Upconverting Particles Powering up TiO2 Photocatalysis in Near-Infrared Light

Catalysts

Paulina O’Callaghan¹  Wojciech Macyk¹  Przemysław Łabuz¹  Agnieszka Jarosz-Duda¹  Joanna Kuncewicz¹ 

[1] Jagiellonian University, Faculty of Chemistry, Gronostajowa 2, 30-387 Kraków, Poland;

关键词: photocatalysis;    upconversion;    near-infrared (nir);    lanthanides;    tio₂;   

DOI  :  10.3390/catal10020232

来源: DOAJ

【 摘 要 】

The core-shell NaYb_0.99F₄:Tm_0.01@NaYF₄ upconverting particles (UCPs) with a high UV emission to apply in NIR-driven photocatalysis were synthesized. The influence of the Yb³⁺ doping concentration in NaY_xF₄:Yb_0.99−xTm_0.01 core particles, and the role of the NaYF₄ shell on the upconversion emission intensity of the UCPs were studied. The absorption of NIR light by the obtained UCPs was maximized by increasing the Yb³⁺ concentration in the core, reaching the maximum for Y³⁺-free particles (NaYb_0.99F₄:Tm_0.01). Additionally, covering the NaYb_0.99F₄:Tm_0.01 core with a protective layer of NaYF₄ minimized the surface luminescence quenching, which significantly improved the efficiency of upconversion emission. The high intensity of the UV light emitted by the NaYb_0.99F₄:Tm_0.01@NaYF₄ under NIR irradiation resulted in a high photocatalytic activity of TiO₂ (P25) mixed with the synthesized material.

【 授权许可】

Unknown