[21p-B101-1~8] 【Onsite Only】Creation and application of perovskite as a next-generation materials

△ [21p-B101-3] Stabilization Cubic Phase of CsPbI₃ Quantum Dots for High Efficiency Light Emitting Diodes

〇Hinako Ebe¹, Rikuo Suzuki², Shun Sumikoshi², Mizuho Uwano², Reine Moriyama², Takayuki Chiba², Junji Kido² (1.Yamagata Univ. Sci., 2.Yamagata Univ.)

Keywords:Perovskite Quantum Dots, Phase Stabilization, LED

We demonstrated the post-synthetic guanidium iodide (GAI) doping treatment for precisely size controlled CsPbI₃ QDs to stabilize the phase and surface chemistry. By size-controlling and GAI post synthetic treatment, the CsPbI₃ QDs exhibited the stabilization of cubic-phase and the enhancement of PL intensity. We also achieved external quantum efficiency of 23% and longer operational device lifetime (LT₅₀ of over 10 hours) in the GAI-doped CsPbI₃ QD-LED. We investigated the stabilization of CsPbI₃ QD phase and the enhancement of device performance by reducing crystal strain and GAI doping treatments.