[22a-E206-1~6] 12.4 Organic light-emitting devices and organic transistors

△ [22a-E206-5] Optical Characteristics of Films Based on Green Emissive InP-based Quantum Dots with Different Ligands and their Application to Hybrid Light-Emitting Diodes

〇Maowei Huang¹, Hirotake Kajii¹, Shinsei Yamada¹, Akihito Okamoto¹, Haruki Bai¹, Masaaki Hirakawa², Shintaro Toda², Masato Morifuji¹, Masahiko Kondow¹ (1.Osaka Univ., 2.ULVAC Inc.)

Keywords:quantum dot, organic light-emitting diode

For quantum dots (QDs) with a core-shell structure, by changing the ligands, the dispersion and aggregation states of QDs change, which affects the device characteristics. In this study, we evaluated the optical properties of the QD thin film and the characteristics of the QD-OLED using InP QD in which a part of the long-chain oleic acid ligand was replaced with short Cl, aiming at the control of the cohesiveness of the QD thin film. The relative photoluminescence quantum yield of QD decreased as the exchange amount of ligands increased. From the electroluminescence spectrum of the device, it is presumed that the emission of the transport layer was suppressed and the emission recombination in the Cl-exchanged QD was improved.