Chiral europium halides with high-performance magnetic field tunable red circularly polarized luminescence at room temperature.
basic_science · Level V
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- Record sourced from PubMed, PMID 40082417.
- Also identified by DOI 10.1038/s41467-025-57620-0 and PMC identifier 11906753.
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Abstract
Chiral organic-inorganic hybrid metal halides as promising circularly polarized luminescence (CPL) emitter candidates hold great potential for high-definition displays and future spin-optoelectronics. The recent challenge lies primarily in developing high-performance red CPL emitters. Here, coupling the f-f transition characteristics of trivalent europium ions (Eu<sup>3+</sup>) with chirality, we construct the chiral Eu-based halides, (R/S-3BrMBA)<sub>3</sub>EuCl<sub>6</sub>, which exhibit strong and predictable red emission with large photoluminescence quantum yield (59.8%), narrow bandwidth (≈2 nm), long lifetime (≈2 ms), together with large dissymmetry factor |g<sub>lum</sub>| of 1.84 × 10<sup>-2</sup>. Compared with the previously reported chiral metal halides, these chiral Eu-based halides show the highest red CPL brightness. Furthermore, the degree of photoluminescence polarization in (R/S-3BrMBA)<sub>3</sub>EuCl<sub>6</sub> can be manipulated by the external magnetic field. Particularly, benefiting from the field-generated Zeeman splitting and spin mixing at exciton states, an anomalously positive magneto-photoluminescence was observed at room temperature. This work provides an efficient strategy for constructing both high-performance and pure-red CPL emitters. It also opens the door for chiral rare-earth halides toward chiral optoelectronic and spintronic applications.