Bai Xianwei, Meng Lingqiang, Zhou Ni, Zheng Jinju, Yu Xue-Feng, Chu Paul K, Xiao Jun-Jun, Zou Bingsuo, Li Jia
Materials Interfaces Center, Shenzhen Institute of Advanced Technology, Chinese Academy of Sciences, Shenzhen 518055, China.
Institute of Materials, Ningbo University of Technology, Ningbo 315211, China.
J Colloid Interface Sci. 2022 Jan 15;606(Pt 2):1163-1169. doi: 10.1016/j.jcis.2021.08.068. Epub 2021 Aug 14.
Mn-doped perovskite nanocrystals have promised new optoelectronic applications due to their unique material properties. In the present study, Mn-doped perovskite nanocrystalline films were prepared in situ in a polymer matrix. The Mn-doped perovskite nanocrystals (PNCs) had good crystallinity and uniform size/spatial distributions in the polymer film. Bright dual-color emission and the long lifetime of the excited state of the dopant were observed from the host exciton and the Mn dopant, respectively. Furthermore, magnetism was observed in the optimal Mn concentration, implying that magnetic coupling was achieved in the Mn-doped perovskite lattice. The Mn-doped perovskite films also showed superior stability against moisture. To demonstrate the practicality of this composite film, a white light emitting device was fabricated by combining a single composite film with a blue light emitting diode; the device showed a high-quality white light emission, and the Commission Internationale De L'Eclairage (CIE) chromaticity coordinate of the white light emitting diode (WLED) (0.361, 0.326) was close to the optimal white color index. In this single-layer WLED, self-absorption among the luminous multilayers in traditional white light emitting diodes can be avoided. The study findings revealed that Mn-doped perovskite nanocrystalline films have many exciting properties, which bodes well for the fundamental study and design of high-performance optoelectronic devices.
锰掺杂的钙钛矿纳米晶体因其独特的材料特性而有望应用于新型光电器件。在本研究中，锰掺杂的钙钛矿纳米晶薄膜在聚合物基体中原位制备。锰掺杂的钙钛矿纳米晶体（PNCs）在聚合物薄膜中具有良好的结晶性以及均匀的尺寸/空间分布。分别从主体激子和锰掺杂剂中观察到了明亮的双色发射以及掺杂剂激发态的长寿命。此外，在最佳锰浓度下观察到了磁性，这意味着在锰掺杂的钙钛矿晶格中实现了磁耦合。锰掺杂的钙钛矿薄膜还表现出优异的防潮稳定性。为了证明这种复合薄膜的实用性，通过将单个复合薄膜与蓝色发光二极管相结合制备了一种白色发光器件；该器件显示出高质量的白色发光，并且白色发光二极管（WLED）的国际照明委员会（CIE）色度坐标（0.361, 0.326）接近最佳白色指数。在这种单层WLED中，可以避免传统白色发光二极管中发光多层之间的自吸收。研究结果表明，锰掺杂的钙钛矿纳米晶薄膜具有许多令人兴奋的特性，这为高性能光电器件的基础研究和设计带来了良好的前景。
