The photoluminescence spectrum generated by an ordinary phosphor-converted white light-emitting diode (pc-wLED) that combines a blue LED chip with a yellow phosphor or a near-UV LED with red, green, and blue phosphors contains a notable cavity in the cyan region of the visible spectrum (480–520 nm), which reduces the color quality produced by these lights. Here, we report a new bright blue-cyan-emitting phosphor, NaMgBO₃:Ce³⁺, which bridges the gap. Rietveld refinements verify the rare-earth substitution while ab initio calculations prove that Ce³⁺ occupies the Na⁺ sites. NaMgBO₃:Ce³⁺ is excited by a broad range of near-UV light sources and produces a blue-cyan emission with a high (internal) quantum efficiency, minimal thermal degradation, and zero-chromaticity drift at elevated temperatures. Fabricating a near-UV (λ_ex = 370 nm) pumped pc-wLED using NaMgBO₃:Ce³⁺ along with commercially available phosphors demonstrates a well-distributed warm white light with a high color-rendering index (R_a) of 91 and a low correlated color temperature (CCT) of 3645 K. Closing the cyan cavity with NaMgBO₃:Ce³⁺ is ideal for generating a pleasant, full-spectrum warm white light.

中文翻译：

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使用NaMgBO ₃：Ce ³⁺消除全光谱LED照明的青色差距

由普通的磷光转换的白色发光二极管（pc-wLED）产生的光致发光光谱将蓝色LED芯片与黄色磷光体或近紫外LED与红色，绿色和蓝色磷光体结合在一起，在其中包含明显的空腔。可见光谱的青色区域（480-520 nm），降低了这些光产生的色彩质量。在这里，我们报告了一种新的发出蓝光的明亮荧光粉NaMgBO ₃：Ce ³⁺，它弥合了这种差距。Rietveld的改进方法验证了稀土元素的替代，而从头算计算证明Ce ³⁺占据了Na ⁺位点。NaMgBO ₃：Ce ³⁺被广泛的近紫外光源激发并产生蓝绿色发射，具有高（内部）量子效率，最小的热降解和在高温下的零色度漂移。使用NaMgBO ₃：Ce ³⁺和市售磷光体制造近紫外（_λex = 370 nm）泵浦的pc-wLED ，可显示出分布均匀的暖白光，其高显色指数（R _a）为91和低的相关色温（CCT）为3645K。使用NaMgBO ₃：Ce ³⁺关闭青色腔是生成令人愉悦的全光谱暖白光的理想选择。