Prof. Takayuki Chiba Profile

Prof. Takayuki Chiba

at Yamagata Univ

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Proceedings Article | 10 September 2019 Presentation

Anion exchange perovskite quantum-dots for highly efficient light-emitting-devices (Conference Presentation)

Takayuki Chiba, Yukihiro Hayashi, Keigo Hoshi, Hinako Ebe, Junji Kido

Proceedings Volume 11093, 110930X (2019) https://doi.org/10.1117/12.2530666

KEYWORDS: Perovskite, Light emitting diodes, External quantum efficiency, Luminescence, Bromine

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Here, we demonstrate anion-exchange red perovskite QDs CsPb(Br/I)3 from pristine CsPbBr3 using ammonium-iodine salts, long alkyl-based oleylammonium iodide (OAM-I) and aryl-based aniline hydoroiodide (An-HI), for use in highly efficient light-emitting devices (LEDs). The anion-exchange CsPb(Br/I)3 films exhibit a strong red-shift in their of photoluminescence (PL) spectrum from the green emission at 508 nm in the case of the pristine QDs to one in the deep-red region at 649 nm owing to the replacement of Br– anions by I–¬ anions in the perovskite QDs. LEDs formed using the anion-exchange CsPb(Br/I)3 based on OAM-I show an remarkable high EQE of more than 20% as well as high color purity, with the Commission Internationale de l'Eclairage (CIE) at (0.72, 0.28), which completely cover BT.2020 color gamut. Similarly, the LEDs formed using the QDs based on An-HI show a peak EQE of 14.1% and CIE coordinates of (0.71, 0.28). Further, they exhibit longer operational stability as compared to that of LEDs formed using the OAM-I-based CsPb(Br/I)3.

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