Organic-inorganic lead halides have attracted the interest of scientific researchers in solid-state lighting due to their advantages such as high absorption coefficient, adjustable spectrum and easy solution preparation. However, the low luminous efficiency of their bulk materials is still the main problem facing everyone. The traditional methods to improve their luminous efficiency are mainly based on colloidal chemistry such as quantum dots, however, lead halide hybrid nanocrystals are inherently unstable. Efficient sensitized luminescence in heterometallic complexes provides new ideas for exploring lead-halogen hybrids with excellent luminescent properties.
The team of Luo Junhua, a researcher at the State Key Laboratory of Structural Chemistry at the Fujian Institute of Research on the Structure of Matter, Chinese Academy of Sciences, for the first time, was funded by key projects of the National Natural Science Foundation of China, the National Outstanding Youth Fund, the National Natural Science Foundation of China Outstanding Youth Fund, and the Chinese Academy of Sciences ’Strategic Pilot Technology Special Project An example of two-dimensional Pb-Mn heterometallic halide hybrids was constructed by introducing Mn2 + luminescence centers. The study found that the strong quantum well effect in its unique two-dimensional heterometallic layered structure effectively promotes energy transfer from bound excitons to the d electrons of Mn2 +, resulting in highly sensitized Mn2 + luminescence. The luminous efficiency of this heterometallic halogenated hybrid (32%) is much higher than its prototype compound (1%). In addition, thanks to its cluster characteristics, the heterometallic halogenated hybrids exhibit significant environmental and thermal stability. This work provides a new design strategy for the design of lead-halogen bulk materials with high luminous efficiency, and further expands the application of heterometallic halogen hybrids in the field of solid-state lighting. The relevant results were recently published in the form of a communication in the United States In the Journal of Chemical Society (J. Am. Chem. Soc. 2019, 141, 12197-12201), Ph.D. student Peng Yu was the first author of the paper.
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