[The team of Academician Huang Wei of Northwestern Polytechnical University and Professor Wang Jianpu reported in "Nature Communications" about non-lead metal halide warm white light-emitting diodes] @The team of Academician Huang Wei of Northwestern Polytechnical University and

[The team of Academician Huang Wei of Northwestern Polytechnical University and Professor Wang Jianpu reported in "Nature Communications" about non-lead metal halide warm white light-emitting diodes] @The team of Academician Huang Wei of Northwestern Polytechnical University and Professor Wang Jianpu and Professor Wang Nana of Nanjing University of Technology passed the research on copper-based By introducing non-ionic surfactants into the halide precursor solution, efficient and high-brightness non-lead warm white metal halide LEDs were realized for the first time. Based on the strong interaction between the ether bond introduced in the additive (Tween) and Cs+ in the system, on the one hand, it can delay the crystallization process of copper-based halide and reduce defects; on the other hand, it can increase the film surface potential and improve carrier migration. efficiency, which is beneficial to improving the injection and transmission of carriers in the device. Based on this film, the external quantum efficiency of the prepared warm white LED device reaches 3.1%, and the brightness reaches ~1600 cd m-2 at a voltage of 5.4 V, which is the current highest record for non-lead metal halide white LEDs. This important research result was recently published in the academic journal Nature Communications. Ph.D. students Chen Hong, Dr. 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 lead-free metal halide optoelectronic devices.

Source: Shaanxi Provincial Department of Education