[17p-Z24-1~14] 12.3 Functional Materials and Novel Devices

△ [17p-Z24-12] Precise control of emission wavelength of perovskite quantum dots by crystal lattice distortion

〇(M2)Ryota Sato¹, Yusaku Morikawa², Takayuki Chiba^3,4, Satoshi Asakura^1,5, Akito Masuhara^1,4 (1.Grad. Sch. of Sci. and Eng., Yamagata Univ., 2.Fac. of Eng., Yamagata Univ., 3.Grad. Sch. of Org. Mat. Sci., Yamagata Univ., 4.FROM, Yamagata Univ., 5.Ise Chem. Corp.)

Keywords:Perovskite quantum dots, Cation mix, Formamidinium lead bromide

Green-emissive perovskite quantum dots (PeQDs) have attracted attention due to their excellent optical properties, e.g. high photoluminescence quantum yield and high color purity. Despite their optical properties, precise control of green-emissive wavelength (λ_PL) of PeQDs could not be achieved, resulting in issues that are difficult to prepare PeQDs having an ideal green-emissive wavelength of 532 nm required by BT. 2100. Although λ_PL significantly changes due to “control of hybrid orbitals” and “crystal lattice strain” by mixing B and/or X site of PeQDs, in other words, it is shown impossible to precise control of λ_PL.
To solve these issues, A site mixed PeQDs were prepared. In this system, it is expected to eliminate the effect of “control of hybrid orbitals”. As a result, λ_PL of PeQDs can be precisely controlled by only changing “crystal lattice strain”, and green-emissive PeQDs with λ_PL 532 nm were successfully prepared.