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  ______     ___     _____       ___              
 /_____//   / _ \\  |  __ \\    / _ \\    ____    
 `____ `   | / \ || | |  \ ||  / //\ \\  |    \\  
 /___//    | \_/ || | |__/ || |  ___  || | [] ||  
 `__ `      \___//  |_____//  |_||  |_|| |  __//  
 /_//       `---`    -----`   `-`   `-`  |_|`-`   
 `-`                                     `-`

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Text this: Optical and luminescence properties of Pr<sup>3+</sup> in Gd<inf>2</inf>O<inf>3</inf>-CaO-SiO<inf>2</inf>-B<inf>2</inf>O<inf>3</inf> glasses