Investigation of high-performance perovskite nanocrystals for inkjet-printed color conversion layers with superior color purity

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%.

An overview on the principle of inkjet printing technique and its application in micro-display for augmented/virtual realities

“…In a word, the addition of polymer can improve the stability of CCLs at the expense of quantum dot efficiency. The prepared film as a color conversion layer provides a possible idea for realizing full-color micro-LED 43 .…”

“…Jiang et al used a dual-solvent system to adjust the surface tension of CdSe@ZnS/ZnS ink. The surface tension of the mixed solvent with 20 vol % 1,2-dichlorobenzene and 80 vol % cyclohexylbenzene reduced to 31.77 43 , John Wiley and Sons; (c) ref. 17 , American Chemical Society; (d-f) ref.…”

“…Figure reproduced with permission from: (a) ref. 113 , American Chemical Society; (b) ref 43 ,. John Wiley and Sons; (c) ref 17 ,.…”

Investigation of highly luminescent inorganic perovskite nanocrystals synthesized using optimized ultrasonication method

“…One of the most important properties of PeNCs is that the band gap can be easily tuned by adjusting the ratio of halide elements. The outstanding optoelectronic properties of inexpensive and solution-processable lead-halide PeNCs have brought them to the forefront of many research fields, such as the development of solar cells [2] , [3] , light emitting diodes (LEDs) [4] , [5] , [6] , photodetectors [7] , [8] , lasers [9] , and semiconductors [10] , [11] . Their initial research was focused on organic/inorganic hybrid materials, but all-inorganic materials quickly gained priority because of their higher stability.…”

“…Such devices provide excellent display performance and are suitable for industrial scale production. Their color reproducibility can be improved by adding QD CCLs on top of the blue OLED light source [6] , [21] . Thus, PeNCs which have solution processability and superior optical properties compared to conventional QD materials, were used as CCLs, and applied as PeNCs/OLED devices.…”