Work

Complementary Advantages: Construction of Rare‐Earth‐Free Sunlight Conversion CsMnCl3(H2O)2/Cs3SbCl6 Heterojunction for Energy‐Saving Agricultural Cultivation

Year: 2025

Type: article

Abstract: Development of efficient sunlight conversion materials is critical for advancing sustainable agricultural practices, but current solutions often face challenges such as poor stability, high cost, and reliance on rare‐earth elements. This study presents a rare‐earth‐free xCsMnCl3(H2O)2/(1−x)Cs3SbCl6 heterojunction (x = 1−0.65) synthesized via an eco‐friendly mechanochemical method. By strategically combining Cs3SbCl6 as a UV‐absorbing donor with CsMnCl3(H2O)2 as an efficient red emitter. The optimized heterojunction achieves a remarkable 36‐fold enhancement at 626 nm (Full width at half maxima (FWHM) = 88 nm), perfectly matching chlorophyll a's absorption spectrum. Comprehensive experimental and theoretical analyses, including UV–vis absorption, photoluminescence (PL) spectroscopy, and density functional theory (DFT) calculations, reveal a dual enhancement mechanism: i) efficient interfacial electron‐hole transfer and ii) suppression of non‐radiative recombination through defect passivation. The practical application is demonstrated through a sunlight conversion film fabricated by embedding the 0.75CsMnCl3(H2O)2/0.25Cs3SbCl6 composite in Ecoflex‐0030, which exhibits exceptional environmental stability (90% PL retention after 90 days) and mechanical durability (500% tensile strain). The plant growth experiments confirm the film's agricultural efficacy, with chives and green cabbage growth rates increasing by 1.5‐ and 1.3‐fold, respectively, compared to natural light conditions. This work not only addresses the limitations of existing light‐conversion materials but also establishes a rare‐earth‐free, eco‐friendly platform for energy‐efficient agriculture.

Source: Advanced Optical Materials

DOI: 10.1002/adom.202500636