发光材料的特征在于其荧光量子产率。对于有机和无机 LED 之类的发光器件，相应的物理值是外部量子效率，通常通过电致发光 (EL) 方法测量。对于此应用，外量子效率测量系统 C9920-12 系统应运而生。
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