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Colloidal Synthesis of Double Perovskite Cs 2 AgInCl 6 and Mn-Doped Cs 2 AgInCl 6 Nanocrystals

2018; American Chemical Society; Volume: 140; Issue: 40 Linguagem: Inglês

10.1021/jacs.8b07983

1943-2984

Federico Locardi, Matilde Cirignano, Dmitry Baranov, Zhiya Dang, Mirko Prato, Filippo Drago, M. Ferretti, Valerio Pinchetti, M. Fanciulli, Sergio Brovelli, Luca De Trizio, Liberato Manna,

Quantum Dots Synthesis And Properties

We show here the first colloidal synthesis of double perovskite Cs2AgInCl6 nanocrystals (NCs) with a control over their size distribution. In our approach, metal carboxylate precursors and ligands (oleylamine and oleic acid) are dissolved in diphenyl ether and reacted at 105 °C with benzoyl chloride. The resulting Cs2AgInCl6 NCs exhibit the expected double perovskite crystal structure, are stable under air, and show a broad spectrum white photoluminescence (PL) with quantum yield of ∼1.6 ± 1%. The optical properties of these NCs were improved by synthesizing Mn-doped Cs2AgInCl6 NCs through the simple addition of Mn-acetate to the reaction mixture. The NC products were characterized by the same double perovskite crystal structure, and Mn doping levels up to 1.5%, as confirmed by elemental analyses. The effective incorporation of Mn ions inside Cs2AgInCl6 NCs was also proved by means of electron spin resonance spectroscopy. A bright orange emission characterized our Mn-doped Cs2AgInCl6 NCs with a PL quantum yield as high as ∼16 ± 4%.