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  _  __     ___                 ___      _  __  
 | |/ //   / _ \\    ____      / _ \\   | |/ // 
 | ' //   / //\ \\  |    \\   | / \ ||  | ' //  
 | . \\  |  ___  || | [] ||   | \_/ ||  | . \\  
 |_|\_\\ |_||  |_|| |  __//    \___//   |_|\_\\ 
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Text this: Two-dimensional and emission-tunable : an unusual perovskite constructed from lindqvist-type [Pb6Br19]7- nanoclusters