Missing atoms in a forgotten crystal bring luminescence

phys.org | 10/10/2017 | Staff
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A little-studied member of the perovskite family of materials could find use in a range of electronic devices, after researchers at KAUST discovered the secret of its strong photoluminescence.

Perovskites are a wide group of materials that are known to have remarkable optical and electronic properties. Perovskites with the general formula ABX3, and particularly the perovskite methylammonium lead trihalide, have attracted almost all the research attention thanks to their great promise as low-cost, high-efficiency solar cell materials.

Members - Family - Derivatives - Research - Subjects

Other members of the perovskite family and perovskite derivatives are also worthy research subjects, says Michele De Bastiani, a postdoctoral researcher in Osman Bakr's group at KAUST.

De Bastiani and his colleagues have been testing Cs4PbBr6, a perovskite of the A4BX6 branch of the family. This material is noted for its strong photoluminescence—the ability to absorb light at one wavelength and re-emit it at another.

Material - Applications - Coatings - LED - Light

The material's potential applications include color-converting coatings on LED light bulbs, lasers and photodetectors. But to be able to fine-tune the material's optoelectric properties for each application, researchers need to solve the mystery of why the perovskite photoluminesces so strongly.

"We investigated the structural and optoelectronic properties of Cs4PbBr6 to understand the origin of its photoluminescence," De Bastiani says. Subjecting the material to a barrage of tests, the team discovered that...
(Excerpt) Read more at: phys.org
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