铈掺杂玻璃陶瓷的绝对光谱功率分布与荧光量子产率

Spectral Power Distribution and Quantum Yield in Ce^(3+)-doped Glass-ceramics

采用直径10in积分球结合CCD(Charge Coupled Device)探测器测试系统,在蓝色半导体发光二极管激发下,对Ce3+掺杂的Y3Al5O12(YAG)玻璃陶瓷的荧光光谱进行表征,实现了以荧光发射特性绝对评价为目的的绝对光谱功率分布测定,为白色LED(Light Emitting Diode)荧光材料发射特性的精确测定提供了一种准确方法。荧光测试系统经标准卤素灯定标,辅助卤素灯校正积分球内环境变化,解析出样品发光的绝对光谱功率分布,并进一步计算出光量子数分布,求得荧光量子产率。实验结果表明,YAG高效玻璃陶瓷片的荧光量子产率高达33.7%,为新型高效LED照明发光材料的研制提供了新的标准和比照。

Fluorescence spectra of Ce^3＋ -doped Y3Al5O12 （YAG） glass -ceramics have been determined under the pumping of blue lighting emitting diode （LED） using an integrating sphere of 10 - inch diameter, which connected to a CCD detector. Integrating sphere measurement system is proved to be a reliable and reproducible tool to characterize white lighting phosphors. Standard halogen lamp was used for calibrating the measurement system and auxiliary halogen lamp was applied to determine the changes in throughput at the different steps of the measurement. The spectral power distribution of the sample under the blue LED pumping was derived from the measured spectra first, and then the quantum yield for the visible emission of Ce^3＋ was calculated to be 33.7% based on the distribution. New criterion and reference have been provided for developing new efficient LED luminescence materials.