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<p>The development of lead-free double perovskite materials with superior optoelectronic properties, stable structures, and environmental friendliness is an important focus in physics, chemistry, and materials science. In this study, we report the synthesis of the double perovskites Rb₂B′BiCl₆ (B′ = K, Li) and investigate their optical and structural characteristics. Both Rb₂KBiCl₆ and Rb₂LiBiCl₆ exhibit strong ultraviolet light absorption and indirect band gaps in the wide-band-gap range, suggesting potential for applications such as UV–LEDs and other optoelectronic devices. The prepared compound Rb₂KBiCl₆ crystallise in the cubic Fm3̅m space group, with subtle B-site cation effects on the crystal framework. The as-synthesised double perovskite exhibited exceptionally stable chromaticity when continuously exposed to 365&#xa0;nm UV light, with (x, y) coordinate values of 0.27 and 0.24. These results highlight Rb₂B′BiCl₆ perovskites as environmentally friendly materials with potential in stable, wide-band-gap optoelectronic applications.</p>

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Engineering the optoelectronic properties of lead-free Rb2B’BiCl6 (B = K, Li) double perovskites: highly efficient blue light emission

  • 期刊论文

  • 发表日期：

    2025年11月14日

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  • Kumarasamy Alwar,
  • Padmanaban Annamalai,
  • Walaa Fawzi AL. Masr,
  • Shanmugaraj Krishnamoorthy,
  • Arulmozhi Rajaram

摘要

The development of lead-free double perovskite materials with superior optoelectronic properties, stable structures, and environmental friendliness is an important focus in physics, chemistry, and materials science. In this study, we report the synthesis of the double perovskites Rb₂B′BiCl₆ (B′ = K, Li) and investigate their optical and structural characteristics. Both Rb₂KBiCl₆ and Rb₂LiBiCl₆ exhibit strong ultraviolet light absorption and indirect band gaps in the wide-band-gap range, suggesting potential for applications such as UV–LEDs and other optoelectronic devices. The prepared compound Rb₂KBiCl₆ crystallise in the cubic Fm3̅m space group, with subtle B-site cation effects on the crystal framework. The as-synthesised double perovskite exhibited exceptionally stable chromaticity when continuously exposed to 365 nm UV light, with (x, y) coordinate values of 0.27 and 0.24. These results highlight Rb₂B′BiCl₆ perovskites as environmentally friendly materials with potential in stable, wide-band-gap optoelectronic applications.