UCLA researchers in the Department of Materials Science and Engineering have developed a perovskite-embedded organogel with superior water stability and versatile design and mechanical properties.
Perovskite, a crystalline calcium titanium oxide-like mineral with favorable electron transport properties, is a promising optoelectronic material because of its high device efficiency and facile, readily scalable solution-processed manufacturing. However, several challenges hinder its mass production and commercialization efforts: low environmental (water) stability, structural restriction to inhomogeneous 2D films or powders, and high energy fabrication that can require stringent conditions such as a glovebox. There is a need for new strategies to overcome these challenges and establish a low-energy-cost procedure to synthesize high water-resistivity perovskite materials.
UCLA researchers have developed a convenient and universal one-pot synthesis strategy to create homogeneous perovskite-embedded luminescent polymer gels. The material contains a polymer matrix, which provides a protective hydrophobic structure, with embedded photoluminescent perovskite nanoparticles. The polymer-gel is highly stretchable and resistant to water and aqueous acid. The perovskite nanoparticles are synthesized in-situ with ultra-low-energy requirements and potential to scale for industry production. The optical properties of the perovskite nanoparticles are also chemically tunable, allowing light emission over a broad-range of the visible light spectrum.
The method has been used to successfully create a homogeneous freestanding luminescent perovskite organogel. The polymer-gel had > 950% elongation at fracture and demonstrated long-term water resistance with no obvious PL intensity decline in both water and aqueous acid for more than 110 days (vs. 10~80% drop in 3-60 days in previous reports).
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