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   _____    ______    _____     ______    ____    
  / ___//  /_   _//  /  ___||  /_   _//  |  _ \\  
  \___ \\   -| ||-  | // __     -| ||-   | |_| || 
  /    //   _| ||_  | \\_\ ||   _| ||_   | .  //  
 /____//   /_____//  \____//   /_____//  |_|\_\\  
`-----`    `-----`    `---`    `-----`   `-` --`

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Text this: Green electroluminescence from an n-ZnO: Er/p-Si heterostructured light-emitting diode