[19a-B6-1~9] 12.3 Functional Materials and Novel Devices

10:30 AM - 10:45 AM JST(1:30 AM - 1:45 AM UTC)Presentation by Applicant for JSAP Young Scientists Presentation Award

[19a-B6-6] Enhancing the Photostability of CsPbBr3 Perovskite Quantum Dots through Substituent Space Control of Zwitterionic Ligands

〇(B)Takuro Iizuka¹, Yusaku Morikawa², Takayuki Chiba^3,6, Motofumi Kashiwagi⁴, Satoshi Asakura⁵, Akito Masuhara^6,2 (1.Fac. of Eng., Yamagata Univ., 2.Grad. Sch. of Sci. and Eng., Yamagata Univ., 3.Grad. Sch. of Org. Mat. Sci., Yamagata Univ., 4.Zeon. Corp., 5.Ise Chem. Corp., 6.FROM, Yamagata Univ.)

Keywords:

perovskite,quantum dots,Photostability

Perovskite quantum dots (PeQDs) are next generation optical materials that exhibit excellent optical properties such as high photoluminescence quantum yield (PLQY > 80%) and narrow width of emission spectra (FWHM < 25 nm). On the other hand, the light irradiation required to excite PeQDs causes significant degradation of their optical properties due to the desorption of the ligands that passivate PeQDs upon light irradiation, leading to the formation of surface defects and aggregation of PeQDs. In contrast, a previous study reported that the use of stearyl sulfobetaine (SB3-18), a zwitterionic ligand with two substituents, suppressed the desorption of ligands on the surface of PeQDs due to the chelating effect and successfully improved photostability. However, the optical substituent spacing for the PeQDs surface and its effect on photostability when using zwitterionic ligands remain unclear. In this work, we investigate the substituent spacing effective in suppressing ligand desorption from the surface of PeQDs upon photoirradiation and its effect on photostability.