Chen Ying, Mishra Shashank, Ledoux Gilles, Jeanneau Erwann, Daniel Marlene, Zhang Jinlong, Daniele Stéphane
University of Lyon1, IRCELYON, 2 Avenue A. Einstein, 69626 Villeurbanne (France), Fax: (+33) 472445399; Key Laboratory for Advanced Materials and Institute of Fine Chemicals, East China University of Science and Technology, 130 Meilong Road, Shanghai 200237 (China).
Chem Asian J. 2014 Sep;9(9):2415-21. doi: 10.1002/asia.201402347. Epub 2014 Jun 6.
A novel single-source precursor NaGd(TFA)4 (diglyme) (TFA=trifluoroacetate) was synthesized, characterized thoroughly, and used to obtain the hexagonal phase of NaGdF4 nanoparticles as an efficient matrix for lanthanide-doped upconverting nanocrystals (NCs) that convert near-infrared radiation into shorter-wavelength UV/visible light. These NCs were then used to prepare well-characterized TiO2@NaGdF4:Yb(3+),Tm(3+) nanocomposites to extend the absorption range of the TiO2 photocatalyst from the UV to the IR region. While the visible/near IR part of the photoluminescent spectra remains almost unaffected by the presence of TiO2, the UV part is strongly quenched due to the absorption of TiO2 above its gap at approximately 380 nm by energy transfer or FRET. Preliminary results on the photocatalytic activity of the above obtained nanocomposites are presented.
合成了一种新型单源前驱体NaGd(TFA)4 (diglyme)（TFA = 三氟乙酸盐），对其进行了全面表征，并将其用于制备NaGdF4纳米颗粒的六方相，作为镧系掺杂上转换纳米晶体（NCs）的有效基质，该基质可将近红外辐射转换为更短波长的紫外/可见光。然后使用这些NCs制备了表征良好的TiO2@NaGdF4:Yb(3+),Tm(3+)纳米复合材料，以将TiO2光催化剂的吸收范围从紫外区域扩展到红外区域。虽然光致发光光谱的可见/近红外部分几乎不受TiO2存在的影响，但由于TiO2在约380 nm处高于其禁带的吸收通过能量转移或荧光共振能量转移（FRET）而强烈猝灭，紫外部分受到强烈猝灭。给出了上述所得纳米复合材料光催化活性的初步结果。
