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<p>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 <i>f</i>-<i>f</i> transition characteristics of trivalent europium ions (Eu<sup>3+</sup>) with chirality, we construct the chiral Eu-based halides, (<i>R</i>/<i>S</i>-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 |<i>g</i><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 (<i>R</i>/<i>S</i>-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.</p>

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

  • 期刊论文

  • 出版模式：

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  • 发表日期：

    2025年3月14日

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  • 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,
  • Guankui Long

摘要

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.