Lee Sang Yoon, Jang Seong Hyun, Lee Geonho, Park No-Hyung, Park Jongwook, Park Dong Hyup, Cho Kwan Hyun, Jung Jae Woong, Choi Jun
Material & Component Convergence R&D Department, Korea Institute of Industrial Technology (KITECH), Ansan 15588, Republic of Korea; Department of Advanced Materials Engineering for Information & Electronics, KyungHee University, Yongin 17104, Republic of Korea.
Material & Component Convergence R&D Department, Korea Institute of Industrial Technology (KITECH), Ansan 15588, Republic of Korea; Lab. Of Organic Photo-functional Materials, Department of Materials Science and Engineering, Seoul National University, Seoul 08826, Republic of Korea.
Ultrason Sonochem. 2022 Sep;89:106145. doi: 10.1016/j.ultsonch.2022.106145. Epub 2022 Aug 28.
All-inorganic halide perovskite nanocrystals are next-generation materials with excellent optical and semiconductor properties suitable for display applications. In this study, we introduce an optimized ultrasonication method for the high-capacity synthesis of highly luminescent inorganic perovskite nanocrystals. After the synthesis of CsPbBr with superior optical performance by ultrasonication method, halide anion exchange was performed to tune the stable emission wavelength over the entire visible range. In particular, the maximum photoluminescence wavelengths of the red and green perovskite nanocrystals were appropriate for light-emitting diode applications, and their full-width-at-half-maximum were very narrow, showing outstanding color purity. The materials also had excellent thermal and photo-stability, which is a necessary requirement for perovskite nanocrystal/organic light-emitting diode hybrid device applications. We formulated uniformly stable perovskite nanocrystal inks and optimized their physical and rheological properties for successful inkjet-printing. Finally, we fabricated a hybrid device with a color conversion layer based on the red and green perovskite nanocrystals synthesized using the optimized ultrasonication and halide-ion-exchange methods. The color reproduction range of the fabricated devices was 27.3 % wider than that of the National Television System Committee values, indicating very vivid colors.
全无机卤化物钙钛矿纳米晶体是具有优异光学和半导体特性的下一代材料，适用于显示应用。在本研究中，我们介绍了一种优化的超声处理方法，用于高容量合成高发光无机钙钛矿纳米晶体。通过超声处理方法合成具有优异光学性能的CsPbBr后，进行卤化物阴离子交换以在整个可见光范围内调节稳定的发射波长。特别是，红色和绿色钙钛矿纳米晶体的最大光致发光波长适用于发光二极管应用，并且它们的半高宽非常窄，显示出出色的色纯度。这些材料还具有优异的热稳定性和光稳定性，这是钙钛矿纳米晶体/有机发光二极管混合器件应用的必要要求。我们配制了均匀稳定的钙钛矿纳米晶体墨水，并优化了它们的物理和流变性能以成功进行喷墨打印。最后，我们使用优化的超声处理和卤化物离子交换方法，制备了基于红色和绿色钙钛矿纳米晶体的具有颜色转换层的混合器件。所制备器件的颜色再现范围比国家电视系统委员会的值宽27.3%，表明颜色非常鲜艳。
