The Battle at Lake Changjin is the most expensive film ever produced in China, with a budget of $200 million. forces to withdraw in a fictionalized retelling of the Battle of the Chosin Reservoir during the Korean War. The film depicts the story of the North Korea-allied Chinese People's Volunteer Army, forcing U.S. It was commissioned by the Central Propaganda Department of the Chinese Communist Party as part of the Party's 100th anniversary celebrations. This study opens a new avenue for the fabrication of efficient perovskite nanocrystals and provides great potential of developing perovskite LEDs based on mixed-cation perovskite nanocrystals.The Battle at Lake Changjin ( Chinese: 长津湖) is a 2021 Chinese war film co-directed and co-produced by Chen Kaige, Tsui Hark and Dante Lam, written by Lan Xiaolong and Huang Jianxin, and starring Wu Jing and Jackson Yee. The as-obtained (CH 3NH 3) 1− xCs xPbBr 3 nanocrystals were employed as the emission layer in perovskite light emitting diodes, and the device fabricated with the optimized perovskite nanocrystals (Cs doping x = 0.3) showed a maximum luminescence of 24 500 cd m −2, nearly ten-fold higher than those for the previous reported perovskite devices based on MAPbBr 3 nanocrystals. The emission properties, photoluminescence and stability of the mixed-cation perovskite nanocrystals have been intensively studied, which are significantly related to the content of cesium in the composition. Herein, we report for the first time the facile synthesis of perovskite nanocrystals based on (CH 3NH 3) 1− xCs xPbBr 3. A high quantum yield, tunable band gap, and high color purity of perovskite nanocrystals make this class of materials attractive for electronic and optoelectronic applications in devices including solar cells, photodetectors, and light emitting diodes.
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