Cheng Yu-Hong, Suzuki Rikuo, Shinotsuka Narumi, Ebe Hinako, Oshita Naoaki, Yamakado Ryohei, Chiba Takayuki, Masuhara Akito, Kido Junji
Graduate School of Organic Materials Science, Yamagata University, 4-3-16 Jonan, Yonezawa, Yamagata, 992-8510, Japan.
Graduate School of Science and Engineering, Yamagata University, 4-3-16 Jonan, Yonezawa, Yamagata, 992-8510, Japan.
Sci Rep. 2022 Mar 17;12(1):4620. doi: 10.1038/s41598-022-08760-6.
The emergence of green materials has attracted considerable attention in the field of optoelectronics. Copper-based lead-free metal halide (with a near-unity quantum yield) obtained from CsCuI nanocrystals (NCs) 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 inadequate toward a high-performance device. In this study, antisolvent-free gel permeation chromatography is used to purify CsCuI NCs. The purified CsCuI NCs exhibit a high photoluminescent quantum yield and provide a highly oriented single-crystal film. Density functional theory calculation results indicate that the iodide-rich surface in the NCs makes them highly stable. In addition, it has been demonstrated for the first time that the mixture of polymethyl methacrylate (PMMA) and CsCuI NCs has waterproofing capabilities. The composite film consisting of CsCuI NCs and PMMA can survive in water for several days. This result opens up more possibilities for the application of these green material.
绿色材料的出现引起了光电子领域的广泛关注。由CsCuI纳米晶体（NCs）获得的铜基无铅金属卤化物（量子产率接近1）可呈现波长为440 nm的蓝色发射，并为各种应用提供出色的稳定性。然而，在实际应用中，胶体分散纯度和薄膜质量对于高性能器件而言并不理想。在本研究中，采用无反溶剂凝胶渗透色谱法纯化CsCuI NCs。纯化后的CsCuI NCs表现出高光致发光量子产率，并提供高度取向的单晶薄膜。密度泛函理论计算结果表明，NCs中富含碘化物的表面使其具有高度稳定性。此外，首次证明聚甲基丙烯酸甲酯（PMMA）与CsCuI NCs的混合物具有防水能力。由CsCuI NCs和PMMA组成的复合薄膜可在水中存活数天。这一结果为这些绿色材料的应用开辟了更多可能性。
