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<p>Metal halide double perovskites (DP) have advanced rapidly during the last decade, indicating their potential use in nanotechnology. The common molecular composition that drives their photoluminescence properties has drawn a growing group of academics. The low inherent durability and superficial flaws of perovskite Nano Crystals have restricted their wide adoption. Lead-free perovskites have received much attention due to their great stability and environmental friendliness. On the other hand, the multistep solution-based perovskite synthesis poses significant safety concerns and introduces trap states into the perovskite, diminishing its characteristics and activities. This study establishes a Cs<sub>2</sub>KBiBr<sub>6</sub>-xgCN heterojunction (gCN, graphitic carbon nitride) via an ecologically friendly solid-state blending approach. We synthesized gCN-Cs<sub>2</sub>KBiBr<sub>6</sub> composites at room temperature. Unlike the emission from Cs<sub>2</sub>KBiBr<sub>6</sub> host (432&#xa0;nm), Cs<sub>2</sub>KBiBr<sub>6</sub>-5gCN (458&#xa0;nm) emits a strong blue light at an excitation wavelength of 310&#xa0;nm. Furthermore, Cs<sub>2</sub>KBiBr<sub>6</sub>-5gCN has good stability and photoluminescence characteristics. A light-emitting diode similar to that of pure white light using Cs<sub>2</sub>KBiBr<sub>6</sub>-5gCN, achieving a high color rendering index of 90 is predicted. These findings indicate that Cs<sub>2</sub>KBiBr<sub>6</sub>-5gCN might be a viable choice in the realm of inorganic luminous compounds.</p>

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Engineering the two-dimensional g-C3N4 with Cs2KBiBr6 double perovskite composite for efficient and stable blue light emission

  • 期刊论文

  • 发表日期：

    2025年1月10日

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  • Kumarasamy Alwar,
  • Muralidharan Rajaram,
  • Abirami Natarajan,
  • Tamizharasan Selvakumar,
  • Arulmozhi Rajaram

摘要

Metal halide double perovskites (DP) have advanced rapidly during the last decade, indicating their potential use in nanotechnology. The common molecular composition that drives their photoluminescence properties has drawn a growing group of academics. The low inherent durability and superficial flaws of perovskite Nano Crystals have restricted their wide adoption. Lead-free perovskites have received much attention due to their great stability and environmental friendliness. On the other hand, the multistep solution-based perovskite synthesis poses significant safety concerns and introduces trap states into the perovskite, diminishing its characteristics and activities. This study establishes a Cs2KBiBr6-xgCN heterojunction (gCN, graphitic carbon nitride) via an ecologically friendly solid-state blending approach. We synthesized gCN-Cs2KBiBr6 composites at room temperature. Unlike the emission from Cs2KBiBr6 host (432 nm), Cs2KBiBr6-5gCN (458 nm) emits a strong blue light at an excitation wavelength of 310 nm. Furthermore, Cs2KBiBr6-5gCN has good stability and photoluminescence characteristics. A light-emitting diode similar to that of pure white light using Cs2KBiBr6-5gCN, achieving a high color rendering index of 90 is predicted. These findings indicate that Cs2KBiBr6-5gCN might be a viable choice in the realm of inorganic luminous compounds.