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‘Chameleon’ crystals change colour under pressure

A set of fluorescent microscopic images of a (PEA)2PbI4 crystal taken at the same lamp power

A crystal glows different colours depending on how much it is compressed (lower right, at atmospheric pressure; upper left, at roughly 35,000 times atmospheric pressure). Credit: Liu Sheng

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Nature 572, 156 (2019)




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