Perovskite Light‐Emitting Diodes: Perovskite Quantum Dots with Ultralow Trap Density by Acid Etching‐Driven Ligand Exchange for High Luminance and Stable Pure‐Blue Light‐Emitting Diodes (Adv. Mater. 15/2021)
Chenghao Bi, Zhiwei Yao, Xuejiao Sun, Xuecheng Wei, Junxi Wang, Jianjun Tian
Abstract
In article number 2006722, Jianjun Tian and co-workers report pure-blue perovskite light-emitting diodes (LEDs) based on ultralow-trap-density and extremely stable small-sized CsPbBr3 quantum dots, which is achieved by a novel acid-etching-driven ligand exchange. The LEDs exhibit electroluminescence at 470 nm wavelength with external quantum efficiency of 4.7%, remarkable high luminance (3850 cd m−2), and long-term operational stability T50 of 12 h.
Topics & Concepts
ElectroluminescenceMaterials scienceLight-emitting diodePerovskite (structure)Quantum dotOptoelectronicsDiodeLuminanceEtching (microfabrication)OLEDOpticsNanotechnologyCrystallographyChemistryPhysicsLayer (electronics)Perovskite Materials and ApplicationsQuantum Dots Synthesis And PropertiesConducting polymers and applications