Yin Qianxi, Xu Rongrong, Wang Xiaoting, Li Mulin, Huang Xianliang, Chen Ziyi, Ma Teng, Xie An, Chen Jun, Zeng Haibo
Institute of Optoelectronics and Nanomaterials, MIIT Key Laboratory of Advanced Display Materials and Devices, School of Materials Science and Engineering, Nanjing University of Science and Technology, Nanjing 210094, China.
School of Physics, Nanjing University of Science and Technology, Nanjing 210094, China.
ACS Appl Mater Interfaces. 2024 Sep 11;16(36):48094-48102. doi: 10.1021/acsami.4c09606. Epub 2024 Aug 27.
Lead halide perovskite anion exchange reactions tend to be spontaneous and rapid. To achieve precise control of anion exchange and modulate the bandgaps of perovskites to meet the demands in full-color displays, a laser-induced liquid-phase anion exchange method is developed in this paper. CsPbBr perovskites embedded in a polymer matrix are converted to CsPb(BrCl) and CsPb(BrI) perovskites, realizing the shift from green fluorescence to blue and red fluorescence. By changing the laser parameters, the anion exchange extent and luminescence wavelength are precisely tuned, with the maximum tuning wavelength range of 431-696 nm. Due to the focusing properties of the laser, the spatial position of anion exchange can be precisely controlled, which is significant for realizing fast and accurate patterning without masks. Based on this method, blue patterns with different light-emitting wavelengths are fabricated. RGB three-color patterns on a single perovskite composite film are successfully prepared by further replacement of halogen ions. More importantly, the polymer matrix provides ultraflexibility and good stability for the films; even if the composite films are arbitrarily folded or repeatedly bent, they can still maintain good luminous intensity. This method will show great potential in the field of flexible, full-color displays.
卤化铅钙钛矿阴离子交换反应往往是自发且快速的。为了实现对阴离子交换的精确控制并调节钙钛矿的带隙以满足全彩显示的需求，本文开发了一种激光诱导液相阴离子交换方法。嵌入聚合物基质中的CsPbBr钙钛矿被转化为CsPb(BrCl)和CsPb(BrI)钙钛矿，实现了从绿色荧光到蓝色和红色荧光的转变。通过改变激光参数，可以精确调节阴离子交换程度和发光波长，最大调谐波长范围为431 - 696 nm。由于激光的聚焦特性，可以精确控制阴离子交换的空间位置，这对于实现无掩膜的快速精确图案化具有重要意义。基于此方法，制备了具有不同发光波长的蓝色图案。通过进一步替换卤素离子，成功在单个钙钛矿复合膜上制备了RGB三色图案。更重要的是，聚合物基质为薄膜提供了超柔韧性和良好的稳定性；即使复合膜被任意折叠或反复弯曲，它们仍然可以保持良好的发光强度。该方法将在柔性全彩显示领域展现出巨大潜力。
