Summary of Journal Paper: Nanocrystals of Cesium Lead Halide Perovskites (CsPbX3, X = Cl, Br, and I): Novel Optoelectronic Materials Showing Bright Emission with Wide Color Gamut

 This paper is published by Loredana Protesescu & V. Kovalenko et al in Nano letters in 2015 (Nano Lett. 2015, 15, 6, 3692–3696). 

In this paper, Kovalenko group has shown a novel way of synthesizing highly illumination perovskite-based colloidal quantum dots. These colloidal nanocubes with each length of 4 to 15-nanometer wide color gamut with covering of 140% NTSC color standards. Also, these cubic nanocrystals have a narrow emission line with the FWHM of 12 to 42 nanometers as well as the content yield was up to 50-90% and radiate radioactive lifetime in the range of 1 to 29 nanoseconds. They have used the “hot-injection” technique to synthesize the perovskite-based quantum dot materials. Alivisatos and Bawendi et al. first introduced this method of synthesizing monodisperse CdS Quantum dots. This method involves the production of homogeneous nuclei via the rapid injection of organometallic reagents into a hot solvent. The reaction solution used during this process also contains surfactant molecules to prevent QDs from agglomerating. By changing the halide ion composition (Cl, Br, & I) they could synthesise the quantum dots with covering the whole spectrum (400-700 nm) with bright and high colour purity, The colors are bright and they could embed those nanocrystals into PMMA (polymethylmethacrylate), polymer leading to form a composite of excellent optical clarity. Also, they could compare the optical properties of those nanocrystals with chalcogenide-based materials. These perovskite-based quantum dots show much better optoelectronic properties compared to chalcogenide-based materials, particularly the blue and green regions. However, for the orange and red wavelength region, chalcogenide-based nanocrystals give better performance. As a whole, perovskite-based colloidal quantum dots can be made with cheap chemicals and they have much better optoelectronic properties.

 

This image was taken from Nano Lett. 2015, 15, 6, 3692–3696 journal article.

 

If you want to read the full paper you can access by using this link https://doi.org/10.1021/nl5048779