Beke Dávid, Nardi Marco V, Bortel Gábor, Timpel Melanie, Czigány Zsolt, Pasquali Luca, Chiappini Andrea, Bais Giorgio, Rudolf Mátyás, Zalka Dóra, Bigi Franca, Rossi Francesca, Bencs László, Pekker Aron, Márkus Bence G, Salviati Giancarlo, Saddow Stephen E, Kamarás Katalin, Simon Ferenc, Gali Adam
Wigner Research Centre for Physics, Institute for Solid State Physics and Optics, P.O. Box 49, Budapest H-1525, Hungary.
Department of Atomic Physics, Budapest University of Technology and Economics, Budafoki út 8., Budapest H-1111, Hungary.
Chem Mater. 2021 Apr 13;33(7):2457-2465. doi: 10.1021/acs.chemmater.0c04671. Epub 2021 Mar 18.
X-ray-activated near-infrared luminescent nanoparticles are considered as new alternative optical probes due to being free of autofluorescence, while both their excitation and emission possess a high penetration efficacy . Herein, we report silicon carbide quantum dot sensitization of trivalent chromium-doped zinc gallate nanoparticles with enhanced near-infrared emission upon X-ray and UV-vis light excitation. We have found that a ZnGaO shell is formed around the SiC nanoparticles during seeded hydrothermal growth, and SiC increases the emission efficiency up to 1 order of magnitude due to band alignment that channels the excited electrons to the chromium ion.
X射线激活的近红外发光纳米粒子由于没有自发荧光，被认为是新型的替代光学探针，同时其激发和发射都具有高穿透效率。在此，我们报道了碳化硅量子点敏化的三价铬掺杂的镓酸锌纳米粒子，在X射线和紫外-可见光激发下具有增强的近红外发射。我们发现在种子水热生长过程中，碳化硅纳米粒子周围形成了一层ZnGaO壳，并且由于能带排列将激发电子引导至铬离子，碳化硅使发射效率提高了1个数量级。
