[21a-PA3-1~20] 13.8 Optical properties and light-emitting devices

[21a-PA3-9] Surface modification of quantum dots for quantum-dot light-emitting diodes (QLEDs)

〇(M2)Shunta Nabetani¹, Taro Uematsu¹, Genichi Motomura², Tsuzuki Toshimitsu², Torimoto Tsukasa³, Kuwabata Susumu¹ (1.Osaka Univ., 2.NHK., 3.Nagoya Univ.)

Keywords:Colloidal semiconductor nanopaarticles, Surface Ligand, Quantum Dots LED

Colloidal semiconductor nanoparticles (quantum dots) have attracted attention for their unique size-dependent optical properties and high luminescence efficiency. For these characteristics, Quantum dots are beginning to be used as luminophores in light-emitting devices (LEDs). For the quantum dots to have luminescence, organic ligands are indispensable. These species not only stabilize colloids but also confine carriers in the semiconducting cores that are inevitable to obtain bright photoluminescence. However these ligands often become a barrier to inject carriers into quantum dots from power supply. It is indispensable to investigate surface modification that do not block charge injection and to study the influence of surface ligands on the fluorescence properties of quantum dots. So we paid attention to surface ligands and investigate differences in fluorescence property of CdSe/CdS (core/shell) QDs capped with various thiol molecules. We also report optical properties of QLED using quantum dots capped with these molecules