Chiral europium halides with high-performance magnetic field tunable red circularly polarized luminescence at room temperature

Xinyi Niu, Yang Li, Haolin Lu, Zhaoyu Wang, Yunxin Zhang, Tianyin Shao, Hebin Wang, Sehrish Gull, Bing Sun, Hao-Li Zhang, Yongsheng Chen, Kai Wang (), Yaping Du () and Guankui Long ()
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Xinyi Niu: Nankai University
Yang Li: Beijing Jiaotong University
Haolin Lu: Nankai University
Zhaoyu Wang: Nankai University
Yunxin Zhang: Nankai University
Tianyin Shao: Nankai University
Hebin Wang: Nankai University
Sehrish Gull: Nankai University
Bing Sun: Lanzhou University
Hao-Li Zhang: Lanzhou University
Yongsheng Chen: Nankai University
Kai Wang: Beijing Jiaotong University
Yaping Du: Nankai University
Guankui Long: Nankai University

Nature Communications, 2025, vol. 16, issue 1, 1-9

Abstract: 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 (Eu3+) with chirality, we construct the chiral Eu-based halides, (R/S-3BrMBA)3EuCl6, 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 |glum| of 1.84 × 10−2. 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)3EuCl6 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.

Date: 2025
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DOI: 10.1038/s41467-025-57620-0

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