Lian Kai, Zhang Xiaoyu, Zhao Yiwei, Deng Zhihui, Zhang Fuhao, Wang Zhengtong, Zhang Hu, Han Jiachen, Fan Chao, Sun Chun
State Key Laboratory of Reliability and Intelligence of Electrical Equipment, Hebei University of Technology, 5340 Xiping Road, Tianjin 300401, PR China; Tianjin Key Laboratory of Electronic Materials and Devices, School of Electronics and Information Engineering, Hebei University of Technology, 5340 Xiping Road, Tianjin 300401, PR China.
Key Laboratory of Automobile Materials MOE, School of Materials Science & Engineering, and Jilin Provincial International Cooperation Key Laboratory of High-Efficiency Clean Energy Materials, Jilin University, Changchun 130012, PR China.
J Colloid Interface Sci. 2024 Jun;663:157-166. doi: 10.1016/j.jcis.2024.02.159. Epub 2024 Feb 21.
Perovskite nanoplatelets (NPLs), as a promising material to achieve pure blue emission, have attracted significant attention in high gamut displays. However, the high surface-to-volume ratio and the loosely connected ligands of NPLs make them susceptible to degradation from light, air and heat. As a result, NPLs often exhibit low photoluminescence (PL) intensity and instability. Here, an Mn-ligand passivation strategy is proposed, in which Mn-doped DMAPbBr is used as a precursor. During the perovskite transformation, Mn ions migrate from the lattice of DMAPbBr to the surface of CsPbBr NPLs, which have strong binding forces with ligands. The final products Mn-CsPbBr (M-CPB) NPLs are then acquired by the ligand-induced ripening growth process, which not only exhibit pure blue emission with narrow full width at half maximum (FWHM), but also possess near-unity PL quantum yields (QYs). Besides, M-CPB NPLs show excellent stability due to the strong Mn-ligand passivation layer. Based on the new growth mechanism discovery, the reaction time can be shortened to several minutes by heating. The innovative growth model proposed in this work will provide a paradigm for designing and optimizing future synthesis schemes.
钙钛矿纳米片（NPLs）作为一种有望实现纯蓝光发射的材料，在高色域显示领域引起了广泛关注。然而，NPLs的高表面积与体积比以及连接松散的配体使其容易受到光、空气和热的降解。因此，NPLs通常表现出低光致发光（PL）强度和不稳定性。在此，提出了一种锰-配体钝化策略，其中使用锰掺杂的DMAPbBr作为前驱体。在钙钛矿转变过程中，锰离子从DMAPbBr的晶格迁移到与配体具有强结合力的CsPbBr NPLs表面。然后通过配体诱导的熟化生长过程获得最终产物Mn-CsPbBr（M-CPB）NPLs，其不仅呈现出半高宽（FWHM）窄的纯蓝光发射，而且具有接近单位的PL量子产率（QYs）。此外，由于强大的锰-配体钝化层，M-CPB NPLs表现出优异的稳定性。基于新发现的生长机制，通过加热可将反应时间缩短至几分钟。这项工作中提出的创新生长模型将为设计和优化未来的合成方案提供范例。
