The synthesis and characterisation of the highly stable perovskite nano crystals and their application to ink-jet printed colour conversion layers

• Published in: Journal of industrial and engineering chemistry (Seoul, Korea) 2020, 85(0), , pp.226-239
• Main Authors: Choi, Sol, Lee, Sang Yoon, Kim, Do Yeob, Park, Hyung-Ki, Ko, Min Jae, Cho, Kwan Hyun, Choi, Jun
• Format: Article
• Language: English
• Subjects: Colour gamut; Display; Ink-jet printing; Light-emitting diode; Perovskite; Stability; 화학공학
• ISSN: 1226-086X; 1876-794X
• DOI: 10.1016/j.jiec.2020.02.005

[Display omitted] All-inorganic and hybrid organic–inorganic halide perovskite nanocrystals were synthesised. They were formulated into the ink-jet printable homogeneous inks and uniformly coated. Their stability, photophysical properties, and ink-jettability were optimised. They were successfully adopted for the QD/OLED hybrid display devices. We synthesised cesium lead bromide and formamidinium lead bromide perovskite colloidal nanocrystals by ligand-assisted reprecipitation method for the wide-colour gamut low-cost displays. The prepared perovskite colloidal nanocrystal solutions were formulated into the ink-jet printable homogeneous inks and uniformly coated as the colour conversion layers of the quantum dot organic light-emitting diode displays. The silica capped CsPbBr3 nanocrystals were very stable in high temperature observation while the FAPbBr3 showed the excellent long-term stability at room temperature even without the silica passivation. The ink-jet printed colour conversion films had very narrow full-width-at-half-maximums of around 20nm and high photoluminescence quantum yields of 73.0% and 76.9%, respectively. Particularly, the FAPbBr3 thin film had an excellent cut-off ratio of blue emission and exhibited external quantum efficiency of 5.39% when fabricated as the hybrid display devices.