What They Say
Researchers at Seoul National University have developed perovskite LEDs that can be used to make extremely large pixels. The team said that it has made PeLEDs with an EQE of 22.5% and yet with a pixel size of 102mm². The team used colloidal perovskite nanocrystals with a size of several nanometers.
In such a small dimension, charge carriers can be spatially confined to achieve high luminescence efficiency and organic ligands present in the surface of the nanocrystal can effectively suppress the ion migration and charge trapping. Also, highly uniform and reproducible large-area thin films can be achieved with colloidal perovskite nanocrystals which decouples the crystallization of perovskite from the film formation process. The Seoul National University research team led by Professor Tae-Woo Lee developed simple modified-barcoating which facilitates the evaporation of residual solvent. PeLEDs that incorporated the uniform modified-barcoated perovskite nanocrystal films achieved EQE of 23.26% and EQE of 22.5% in a large pixel area of 102 mm² with high reproducibility.
The research was published in Nature Nanotechnology.
What We Think
I’m not sure who would need 100mm² pixels for a display, but there are plenty of applications in lighting. I remember Mitsubishi made a very large display using a large passive OLED concept. (BR)
Image:Seoul National University
