Abstract
Organic-inorganic halide perovskite CH3NH3PbX3 (X= I, Br, Cl) quantum dots (QDs) possess the characters of easy solution-process, high luminescence yield, and unique size-dependent optical properties. In this work, we have improved the nonaqueous emulsion method to synthesize halide perovskite CH3NH3PbBr3 QDs with tunable sizes. Their sizes have been tailored from 5.29 to 2.81 nm in diameter simply by varying the additive amount of surfactant, n-octylamine from 5 to 120 μL. Correspondingly, the photoluminescence (PL) peaks shift markedly from 520 nm to very deep blue, 436 nm due to quantum confinement effect. The PL quantum yields exceed 90% except for the smallest QDs. These high-quality QDs have potential to build high-performance optoelectronic devices.
Highlights
With transmission electron microscopy (TEM) images, we statistically calculated the average diameters of these five kinds of CH3NH3PbBr3 quantum dots (QDs) prepared with additive n-octylamine of 120, 40, 20, 10, and 5 μL, which are 2.81, 3.07, 3.93, 4.77 and 5.29 nm, respectively
The typical TEM images of the selected QDs prepared with n-octylamine of 120, 20, and 5 μL are shown in Fig. 2(b), (c), and (d), respectively
The diameters of as-prepared CH3NH3PbBr3 perovskite QDs were tuned in the range of 2.815.29 nm mainly by changing the amount of n-octylamine, from 120 to 5 μL
Summary
Wide range tuning of the size and emission color of CH3NH3PbBr3 quantum dots by surface ligands We develop the nonaqueous emulsion synthesis method to control both size and emission color of CH3NH3PbBr3 QDs by the additive amount of surface ligand, n-octylamine.
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