The near-infrared phosphor-converted light-emitting diodes (NIR pc-LEDs) have great potential in food industry and medical fields. For applications based on NIR spectroscopy, the next generation of NIR pc-LEDs is in a high demand of a spectrum with a much broader full width at half-maximum (fwhm), which triggers the discovery of novel broadband NIR phosphors. In this work, the Cr³⁺-doped La₂MgZrO₆ (LMZ) was successfully synthesized by a conventional solid-state method in a reducing atmosphere, and the double-perovskite oxide LMZ with two distorted octahedral sites finally led to an ultra-broadband Cr³⁺ emission centered at 825 nm with an extremely large fwhm of 210 nm and an internal quantum efficiency of ∼58%. The experimental data and theoretical calculation confirmed that two available Cr³⁺ sites with different crystal field environments contributed to the broadband emission. The crystal field parameters, decay time, and temperature-dependent photoluminescence properties were investigated and discussed to further understand the luminescence of Cr³⁺ in LMZ:Cr. The suitability of the title NIR phosphor in multifunctional pc-LEDs was demonstrated by pumping it with blue, green, and/or red LED chips.

中文翻译：

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探索超宽带近红外荧光粉的两点职业—双钙钛矿La ₂ MgZrO ₆：Cr ³⁺

近红外磷光转换发光二极管（NIR pc-LED）在食品工业和医疗领域具有巨大的潜力。对于基于NIR光谱的应用，下一代NIR pc-LED的光谱要求很高，半峰全宽（fwhm）时要宽得多，这触发了新型宽带NIR磷光体的发现。在这项工作中，在还原性气氛中通过传统的固态方法成功地合成了Cr ³⁺掺杂的La ₂ MgZrO ₆（LMZ），并且具有两个扭曲的八面体位的双钙钛矿氧化物LMZ最终导致了超细化。宽带Cr ³⁺发射集中在825 nm，fwhm高达210 nm，内部量子效率约为58％。实验数据和理论计算证实，具有两个不同晶场环境的可用Cr ³⁺位点有助于宽带发射。研究和讨论了晶体场参数，衰减时间和与温度有关的光致发光特性，以进一步了解CrZ ⁺在LMZ：Cr中的发光。通过向其泵浦蓝色，绿色和/或红色LED芯片证明了标题NIR磷光体在多功能pc-LED中的适用性。