Organic-inorganic lead halide hybrids have appealed great interests in solid-state lighting, due to their high absorption coefficients, superior color tunability and low-cost solution processing. However, rational design of bulk lead halide hybrids with high efficiency photoluminescence remains a challenge.
Heterometallic bulk luminophors, which show excellent structural designability and highly sensitized photoluminescence stemming from the strong coupling of different metal centers, provide new insights into the exploration of lead-halogen hybrids with highly efficient photoluminescence.
In a study published in J. Am. Chem. Soc., a research group led by Prof. LUO Junhua from Fujian Institute of Research on the Structure of Matter (FJIRSM) of the Chinese Academy of Sciences, developed an unprecedented two-dimensional (2D) Pb-Mn heterometallic halide hybrid through a precisely tailored synthetic approach.
The researchers revealed that the unique two-dimensional heterometallic halide [Pb4MnCl14]∞ nets are linked by PbMnCl9 dimer clusters and Pb3Cl14 trimer clusters.
The Pb-Mn heterometallic halide hybrid exhibited a highly enhanced PLQE up to 32%, considerably higher than that of pristine one (less than 1%).
This strong emission is ascribed to the internal 4T1 → 6A1 transition of Mn2+, sensitized by the efficient energy transfer from the excitons to Mn2+ in the confined heterometallic halide layered structure.
In addition, they found that the prominent environmental and thermal stability benefits from the clusters feature.
This 2D Pb-Mn heterometallic halide hybrid with highly sensitized Mn2+ emission is unprecedented, which opens up a new route towards superior light emitters via sensitization in rationally designed heterometallic halide hybrids.
Schematic illustration of the strategy (Image by Prof. LUO’s group)
Contact:
Prof. LUO Junhua
Fujian Institute of Research on the Structure of Matter
Chinese Academy of Sciences
E-mail: jhluo@fjirsm.ac.cn
