Pseudohalogen Ammonium Salt-Assisted Syntheses of Large-Sized Indium Phosphide Quantum Dots with Near-Infrared Photoluminescence

Qinggang Hou; Zhonglin Du; Zhe Sun; Jiahua Kong; Yixiao Huang; Keke Wang; Jiajia Ning; Jianguo Tang

doi:10.1021/acs.jpclett.4c00158

Pseudohalogen Ammonium Salt-Assisted Syntheses of Large-Sized Indium Phosphide Quantum Dots with Near-Infrared Photoluminescence

J Phys Chem Lett. 2024 Mar 28;15(12):3285-3293. doi: 10.1021/acs.jpclett.4c00158. Epub 2024 Mar 15.

Authors

Qinggang Hou¹, Zhonglin Du¹, Zhe Sun¹, Jiahua Kong¹, Yixiao Huang¹, Keke Wang¹, Jiajia Ning², Jianguo Tang¹

Affiliations

¹ Institute of Hybrid Materials, National Center of International Joint Research for Hybrid Materials Technology, National Base of International Sci. & Tech. Cooperation on Hybrid Materials, College of Materials Science and Engineering, Qingdao University, 308 Ningxia Road, Qingdao 266071, P. R. China.
² Key Laboratory of Physics and Technology for Advanced Batteries, Ministry of Education, College of Physics, Jilin University, Changchun 130012, P. R. China.

PMID: 38489757
DOI: 10.1021/acs.jpclett.4c00158

Abstract

The development of indium phosphide (InP)-based quantum dots (QDs) with a near-infrared (NIR) emission area still lags behind the visible wavelength region and remains problematic. This study describes a one-step in situ pseudohalogen ammonium salt-assisted approach to generate NIR-emitted InP-based QDs with high photoluminescence quantum yields (PLQYs). The coexistence of NH₄⁺ and PF₆^- ions from NH₄PF₆ may in situ synchronously etch and passivate the surface oxides and impede the creation of traps under the whole growth process of InP QDs. Experimental findings demonstrated that the in situ pseudohalogen ammonium salt-assisted syntheses technique may feature emission at a full width at half-maximum (fwhm) peak as fine as ∼45 nm and broaden the emission range to around ∼780 nm. A two-step approach for ZnS shells was developed to further improve the PLQY of NIR-emitted InP QDs. Furthermore, the constructed high-power intrinsically stretchable NIR color-conversion film employing the InP-based QDs/polymer composites presented excellent luminescence conversion ability and stretchability.