New yellow Ba0.93Eu0.07Al2O4 phosphor for warm-white light-emitting diodes through single-emitting-center conversion
New yellow Ba0.93Eu0.07Al2O4 phosphor for warm-white light-emitting diodes through single-emitting-center conversion
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DOI：
10.1038/lsa.2013.6
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发表时间：
2013-01-01
影响因子：
19.4
通讯作者：
Pan, Zhengwei
中科院分区：
文献类型：
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作者：
Li, Xufan;Budai, John D.;Pan, Zhengwei
用于室内照明的磷光体转换的白色发光二极管需要是暖白色（即，相关色温，4000 K）具有良好的显色性（即，显色指数>80）。然而，由于磷光体的发射光谱中缺乏足够的红色光谱分量，因此没有单磷光体、单发射中心转换的白色发光二极管可以同时满足色温和再现要求。在这里，我们报告了一种新的黄色Ba0.93Eu0.07Al2O4荧光粉，具有新的正交晶格结构，并具有足够的红色光谱分量的宽的黄色光致发光带。当Ba0.93Eu0.07Al2O4磷光体与蓝色发光二极管（440-470 nm）组合时，容易实现具有相关色温（4000 K）和显色指数>80的暖白光发射。这项研究表明，具有高显色性的暖白光发光二极管（即，显色指数>80）可以基于单磷光体、单发射中心转换来实现。
Phosphor-converted white light-emitting diodes for indoor illumination need to be warm-white (i.e., correlated color temperature, 4000 K) with good color rendition (i.e., color rendering index >80). However, no single-phosphor, single-emitting-center-converted white light-emitting diodes can simultaneously satisfy the color temperature and rendition requirements due to the lack of sufficient red spectral component in the phosphors' emission spectrum. Here, we report a new yellow Ba0.93Eu0.07Al2O4 phosphor that has a new orthorhombic lattice structure and exhibits a broad yellow photoluminescence band with sufficient red spectral component. Warm-white emissions with correlated color temperature,4000 K and color rendering index >80 were readily achieved when combining the Ba0.93Eu0.07Al2O4 phosphor with a blue light-emitting diode (440-470 nm). This study demonstrates that warm-white light-emitting diodes with high color rendition (i.e., color rendering index >80) can be achieved based on single-phosphor, single-emitting-center conversion.