A zero-thermal-quenching phosphor
A zero-thermal-quenching phosphor
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DOI：
10.1038/nmat4843
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发表时间：
2017-05-01
期刊：
影响因子：
41.2
通讯作者：
Im, Won Bin
中科院分区：
文献类型：
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作者：
Kim, Yoon Hwa;Arunkumar, Paulraj;Im, Won Bin
磷转换白光发光二极管（pc- wled）是用于照明，高科技显示器和电子设备的高效光源。pc- wled最重要的挑战之一是热猝灭，在大功率LED工作期间，荧光粉随着温度的升高而遭受发射损失。在这里，我们报道了一种蓝色发光的Na3-2xSc2(PO4)(3):xEu（2+）荧光粉（λ (em) = 453 nm），即使在200℃下也不会表现出热猝灭现象。这种零热猝灭现象源于荧光粉补偿发射损失的能力，因此可以在温度升高时保持发光。这些发现可以用多态修饰和随着温度的升高从热激活缺陷能级的电子-空穴对向Eu2+ 5d波段的可能的能量转移来解释。我们的研究结果可以开启零热猝灭荧光粉在大功率LED应用中的探索。
Phosphor-converted white light-emitting diodes (pc-WLEDs) are efficient light sources used in lighting, high-tech displays, and electronic devices. One of the most significant challenges of pc-WLEDs is the thermal quenching, in which the phosphor suffers from emission loss with increasing temperature during high-power LED operation. Here, we report a blue-emitting Na3-2xSc2(PO4)(3):xEu(2+) phosphor (lambda(em) = 453 nm) that does not exhibit thermal quenching even up to 200 degrees C. This phenomenon of zero thermal quenching originates from the ability of the phosphor to compensate the emission losses and therefore sustain the luminescence with increasing temperature. The findings are explained by polymorphic modification and possible energy transfer from electron-hole pairs at the thermally activated defect levels to the Eu2+ 5d-band with increasing temperature. Our results could initiate the exploration of phosphors with zero thermal quenching for high-power LED applications.