In recent years, metal halide perovskites prepared by solution methods have shown great application potential in the fields of display, lighting and energy. At present, the efficiency of monochromatic lead-based perovskite light-emitting diodes (LEDs) is close to that of commercial organic light-emitting diodes (OLEDs), but the toxicity of lead limits its commercial application, and high-efficiency white light perovskite LEDs still need to be solved urgently. Difficult problem.
Generally, the broadband emission of lead-free double perovskite or copper-based halide can be used to obtain white light. However, the currently reported materials are difficult to achieve high fluorescent luminous efficiency and high electrical performance at the same time, resulting in low luminous efficiency and brightness of LED devices. .
In response to this worldwide problem, the team of Academician Huang Wei of Northwestern Polytechnical University and Professor Wang Jianpu and Professor Wang Nana of Nanjing University of Technology achieved the first high-efficiency, high-brightness lead-free solution by introducing non-ionic surfactants into the copper-based halide precursor solution. Warm white metal halide LEDs laid the foundation for the commercialization of perovskite light-emitting diodes.
This important research result was recently published in the academic journal Nature Communications. PhD students Chen Hong, Zhu Lin, and Dr. Xue Chen are the co-first authors of the paper. This work expands the non-lead metal halide material system and is of great significance to the realization of high-performance non-lead metal halide optoelectronic devices.