Abstract
We synthesized cesium lead-halide perovskite colloidal nanocrystals using the hot injection method for wide-color-gamut low-cost displays. An efficient surface defect passivation technique was applied to further improve the optical performance of the green and red perovskite nanocrystals. The prepared perovskite nanocrystal solutions were formulated into inkjet printable homogeneous inks and uniformly printed on the substrate with appropriate surface control. They formed the wide-color-gamut color conversion layers of quantum dot organic light-emitting diode displays. We confirmed the excellent photophysical properties of the synthesized green/red perovskite nanocrystals and the inkjet printed color conversion layers with a photoluminescence quantum yield of 99.7%/96.2% and a wide color reproduction range of 117%.
Highlights
In recent years, lead-halide perovskite materials have attracted great attention in a number of applications including solar cells,1,2 photodetectors,3 biomaterials,4 and light-emitting diodes (LEDs)5,6 owing to their outstanding optical and electronic characteristics
The prepared perovskite nanocrystal solutions were formulated into inkjet printable homogeneous inks and uniformly printed on the substrate with appropriate surface control
Perovskite nanocrystals (PeNCs) have many advantages in the display industry as compared to other light-emitting materials because they have excellent carrier mobility, high photoluminescence quantum yield (PLQY), very high color purity owing to the narrow full width at half maximum (FWHM), the ease of color tuning and wider spectral coverage, and a simple synthesis process with low manufacturing cost
Summary
Lead-halide perovskite materials have attracted great attention in a number of applications including solar cells, photodetectors, biomaterials, and light-emitting diodes (LEDs) owing to their outstanding optical and electronic characteristics. The PeNC solution process can have much higher chemical stability compared with the conventional two-dimensional thin-film deposition process, PeNCs may have massive surface defects owing to their large surface-tovolume ratio and defects from the deficient halogen elements.10,11 These surface defects can severely deteriorate the light-emitting characteristics and degrade the performance of the display device. All-inorganic PeNCs were synthesized by the hot injection method, and an efficient surface defect passivation technique was applied to further improve the optical performance of the green and red PeNCs. An inkjet printed film with sufficient and stable thickness was realized by controlling the surface wettability of the substrate on which the pixel bank was formed to further improve the optical performance of the PeNC CCLs. The structures of the synthesized all-inorganic halide perovskites were analyzed using Fourier transform infrared (FT-IR) spectroscopy, x-ray diffraction (XRD) analysis, and transmission electron microscopy (TEM). The inkjet printing performance and the device characteristics of the fabricated PeNC/OLED hybrid display panels were discussed
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