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 _    _    _    _     ______    _____     _  __  
| \  / || | || | ||  /_   _//  |  ___||  | |/ // 
|  \/  || | || | ||    | ||    | ||__    | ' //  
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`-`  `-`    `---`    `--`      `-----`   `-` --`

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Text this: 一种高电流密度下效率不降低的绿光有机电致发光器件 = High efficiency green organic light-emitting diode without roll-off under high current density