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Proceedings Paper

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

Paper Abstract

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.

Paper Details

Date Published: 10 September 2019
Proc. SPIE 11093, Organic and Hybrid Light Emitting Materials and Devices XXIII, 110930X (10 September 2019); doi: 10.1117/12.2530666
Show Author Affiliations
Takayuki Chiba, Yamagata Univ. (Japan)
Yukihiro Hayashi, Yamagata Univ. (Japan)
Keigo Hoshi, Yamagata Univ. (Japan)
Hinako Ebe, Yamagata Univ. (Japan)
Junji Kido, Yamagata Univ. (Japan)

Published in SPIE Proceedings Vol. 11093:
Organic and Hybrid Light Emitting Materials and Devices XXIII
Chihaya Adachi; Jang-Joo Kim; Franky So, Editor(s)

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