Ultra high efficiency organic-inorganic hybrid light emitting device

2017 Fiscal Year Final Research Report

• Project/Area Number: 15H02203
• Research Category: Grant-in-Aid for Scientific Research (A)
• Allocation Type: Single-year Grants
• Section: 一般
• Research Field: Device related chemistry
• Research Institution: Yamagata University
• Principal Investigator: Kido Junji 山形大学, 大学院有機材料システム研究科, 教授 (50214838)
• Co-Investigator(Kenkyū-buntansha): 千葉 貴之 山形大学, 有機材料システム研究推進本部, 研究員 (20751811) ; 夫 勇進 山形大学, 大学院有機材料システム研究科, 准教授 (00350489)
• Project Period (FY): 2015-04-01 – 2018-03-31
• Keywords: 有機LED / 有機無機ハイブリッド / 量子ドット / ペロブスカイト

Outline of Final Research Achievements

All-inorganic perovskite (CsPbX3, X = Cl, Br, or I) quantum dots (QDs) 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. Here, we demonstrated low driving voltage and high efficiency CsPbBr3 QDs light-emitting devices (QD-LEDs) using a ligand exchange method and washing process with an ester solvent c to remove excess ligands. The LED with ligand exchange CsPbBr3 QDs exhibited a low turn-on voltage of 2.6 V and EQE of 8.7%. Control of the interfacial perovskite QDs through ligand removal and energy level alignment in the device structure are promising methods for obtaining high PLQYs in film state and high device efficiency.

Free Research Field

有機エレクトロニクス