2021年第82回応用物理学会秋季学術講演会

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一般セッション(口頭講演)

12 有機分子・バイオエレクトロニクス » 12.4 有機EL・トランジスタ

[13a-N205-1~12] 12.4 有機EL・トランジスタ

2021年9月13日(月) 09:00 〜 12:15 N205 (口頭)

松島 敏則(九大)、田中 有弥(千葉大)

09:45 〜 10:00

[13a-N205-4] Highly oriented Lead-Free Cs3Cu2I5 Single Nanocrystal Film via Gel Permeation Chromatography Purification

YuHong Cheng1、Rikuo Suzuki1、Narumi Shinotsuka1、Hinako Ebe1、Naoaki Oshita2、Ryohei Yamakado1、Takayuki Chiba1、Akito Masuhara2、Junji Kido1 (1.Yamagata Univ. Org.、2.Yamagata Univ. Eng.)

キーワード:Lead-free, Single crystal, Gel permeation chromatography

The emergence of environment friendly materials has attracted considerable attention in the field of optoelectronics. Copper-based lead-free halide perovskite (with a near-unity quantum yield) obtained from Cs3Cu2I5 can exhibit blue emission with a wavelength of 440 nm and provide outstanding stability for various applications. However, in practical applications, colloidal dispersion purity and film quality are still an issue to make a quality thin film for a device. In this study, an antisolvent-free gel permeation chromatography (GPC) is first used to purify lead-free Cs3Cu2I5 nanocrystals (NCs). The purified Cs3Cu2I5 NCs exhibit completely eliminated impurities from NMR spectra (Fig. 1). The Cs3Cu2I5 NCs also exhibit a high photoluminescent quantum yield (~100% in a colloidal solution and 79.3% in a film) and provide a highly oriented single-crystal film (Fig. 2). Density functional theory (DFT) calculation results showed that the surface energy Cs3Cu2I5 was the lowest at (020) owing to the high phase stability in the film. Finally, it has been demonstrated for the first time that the mixture of polymethyl methacrylate (PMMA) and Cs3Cu2I5 NCs has waterproofing capabilities. The composite film consisting of Cs3Cu2I5 NCs and PMMA can survive in water for at least 10 days. This result opens up more possibilities for the application of these NCs.