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Photo-/electro-luminescence enhancement of CsPbX3 (X = Cl, Br, or I) perovskite quantum dots via thiocyanate surface modification

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Abstract

All-inorganic lead halide perovskite quantum dots (PQDs) are among the most highly applicable luminescent materials for wide-color-gamut displays. Since the development of all-inorganic PQDs, several methods have been implemented to enhance their photo-luminescence quantum yield (PLQY) and stability. However, most treatment procedures only focus on optimizing the green CsPbBr3 perovskite quantum dots. In this work, we extended the usage of SCN ligands to modify the surface of blue, green, and red PQDs for improving their luminescence properties. The presence of SCN on the surface of PQDs was confirmed via Fourier-transform infrared spectroscopy and energy-dispersive X-ray spectroscopy. On the basis of the X-ray photoelectron spectra, the surface modification of PQDs enhanced the PL intensity and PLQY due to the removal of Pb2+ surface defects. The modified PQDs were applied to quantum dot light-emitting diodes (QLEDs), and the performance of the devices was satisfactory, thereby indicating their potential application in high-quality displays.

Graphical abstract: Photo-/electro-luminescence enhancement of CsPbX3 (X = Cl, Br, or I) perovskite quantum dots via thiocyanate surface modification

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Publication details

The article was received on 04 Oct 2019, accepted on 27 Nov 2019 and first published on 02 Dec 2019


Article type: Paper
DOI: 10.1039/C9TC05448K
J. Mater. Chem. C, 2020, Advance Article

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    Photo-/electro-luminescence enhancement of CsPbX3 (X = Cl, Br, or I) perovskite quantum dots via thiocyanate surface modification

    Z. Bao, W. Wang, H. Tsai, H. Wang, S. Chen and R. Liu, J. Mater. Chem. C, 2020, Advance Article , DOI: 10.1039/C9TC05448K

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