Yoo Ju-Hyun, Kim Sungjin, Lee Hyeokjung, Park Cheolmin, Lee Tae-Woo, Park Jin-Woo
Department of Materials Science and Engineering, Yonsei University, Seoul 03722, Republic of Korea.
Department of Materials Science and Engineering, Seoul National University, 1 Gwanak-ro, Gwanak-gu, Seoul 08826, Republic of Korea.
ACS Appl Mater Interfaces. 2023 Aug 23;15(33):39461-39471. doi: 10.1021/acsami.3c03139. Epub 2023 Aug 9.
Inorganic perovskite nanocrystals (IPNCs) have attracted considerable attention due to their excellent optoelectronic properties. However, problems arise from anion migration during the preparation of a blue light-emitting diode (LED), and only small-scale syntheses have been conducted on a laboratory scale. By using only Br as the anion here, CsPbBr was synthesized in the form of nanoplatelets to eliminate the effects of anion migration and to prepare an inorganic perovskite nanoplatelet (IPNPL) emitting blue light. In addition, the synthesis was performed under ambient conditions at room temperature, and the synthetic process was shortened to enable large-scale synthesis. We used a 1 L bottle for large-scale synthesis, and a photoluminescence quantum yield (PLQY) of 78% was observed at 460 nm. We fabricated LEDs by using IPNPLs, and we observed an electroluminescence peak at 461 nm. The developed synthetic method is expected to pave the way for commercialization of IPNCs and the next-generation display market.
无机钙钛矿纳米晶体（IPNCs）因其优异的光电性能而备受关注。然而，在制备蓝光发光二极管（LED）过程中会出现阴离子迁移问题，且仅在实验室规模进行了小规模合成。在此仅使用Br作为阴离子，以纳米片形式合成CsPbBr，以消除阴离子迁移的影响并制备发射蓝光的无机钙钛矿纳米片（IPNPL）。此外，合成在室温环境条件下进行，合成过程缩短以实现大规模合成。我们使用1 L瓶子进行大规模合成，在460 nm处观察到光致发光量子产率（PLQY）为78%。我们使用IPNPL制造LED，并在461 nm处观察到电致发光峰。所开发的合成方法有望为IPNCs的商业化和下一代显示市场铺平道路。
