[20a-145-1~12] 12.4 Organic light-emitting devices and organic transistors

△ [20a-145-3] Highly Efficient Perovskite Quantum-Dot Light-Emitting Device by Gel permeation chromatography as new purification process and Interfacial Engineering using Alkyl Ammonium Salt Layer

〇HINAKO EBE¹, TAKAYUKI CHIBA^1,2,3, YOSHIHITO TAKAHASHI¹, JUN SATO¹, SATORU OHISA^1,2,3, JUNJI KIDO^1,2,3 (1.Grad. Schl. of Org. Mater. Sci, Yamagata Univ., 2.Research Center for Organic Electronics (ROEL), 3.Frontier Center for Organic Materials (FROM))

Keywords:perovskite quantum dots, optoelectronic device

All-inorganic perovskite quantum dots have recently attracted considerable interest for light-emitting device (LED) applications such as thin film displays and solid-state lighting, owing to electroluminescence emission with narrow full width at half maximum (FWHM), tunable color properties in the visible light range, and ease of solution processability. Perovskite QDs are known as ionic nanocrystals, and their optical properties are greatly affected by highly polar washing solvent due to forming cation- and anion-defects. Herein, we fabricated low driving voltage and high efficiency perovskite QD-LED using gel permeation chromatography (GPC) with nonpolar solvent to remove excess ligand such as oleic acid, oleylamine and 1-octadecene. In addition, we demonstrated the effect of interfacial engineering layer using alkyl ammonium salts containing the Br anion, oleylamine bromide, to passivate cation- and anion-defects in perovskite QDs. We achieved a remarkably higher external quantum efficiency of 4.27 % by GPC washing process and interfacial engineering using oleylamine bromide.