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

△ [21a-PA3-10] Electronic structure of core/shell quantum dot fluorophore investigated by photoinduced electron transfer

〇Takuya Sasakura¹, Taro Uematsu¹, Tsukasa torimoto², Susumu Kuwabata¹ (1.Osaka Univ., 2.Nagoya Univ.)

Keywords:quantum dot, core/shell structure, electron confinement effect

Quantum dots (QDs) are semiconductor materials whose size are smaller than 10 nm. Since they emit photoluminescence(PL) with a high monochromaticity and can absorb a wide spectra range of lightdue to the band structure. However, PL quenching and blinking are still remained as a major problem upon applications of the QDs. One of the solutions is core/shell structure, which passivates core nanoparticles with heterogeneous inorganic materials. By covering the core quantum dot with a heterogeneous inorganic material having a wider band gap than the core material, a photogenerated exciton is confined in the core, and the probability of radiative recombination increases by preventing electrons and holes from leaking out of the core. However, when the potential barrier of shell is insufficient, excitons penetrate the shell. This study aims to calculate the electron transfer rate between QD and electron acceptor from the change in PL intensity when electron acceptor was added to the QDs solution with various shell thickness solutions is core/shell structure, which passivates core nanoparticles with heterogeneous inorganic materials.