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离子对诱导高效和热稳定的宽带NIR,用于植物照明和夜视
Cheng Zhou1,2, Junxi Wang1,2, Pingzhi Zhang1
1School of Chemistry and Materials Science, Hunan Agricultural University, Changsha 410128, P. R. China.
ACS applied materials & interfaces
|August 9, 2025
概括
研究人员在LAO:Cr3+中发现了来自合激发状态的新宽带近红外 (NIR) 辐射. 这一发现为夜视和植物照明的先进应用提供了潜力.
科学领域:
- 材料科学 材料科学 材料科学
- 固态物理 固态物理
- 发光的光度是非常的低的.
背景情况:
- 近红外 (NIR) 光由于其独特的光谱特性,在许多领域都很有价值.
- 添加材料 (Cr3+) 通常通过4T2→4A2过渡或从2E水平的窄带辐射呈现宽带NIR辐射.
研究的目的:
- 研究添加材料中的新型宽带NIR发射机制.
- 探索这些材料在光电子设备和专用照明应用中的潜力.
主要方法:
- 合成和表征添加的氨酸 (LAO:Cr3+) 与一个旋转结构.
- 分析晶体结构,位点占用和电子特性,使用像X射线衍射和电子偏磁共振 (EPR) 这样的技术.
- 用光谱测量来分析辐射光谱,量子效率和热稳定性.
主要成果:
- 在LAO:Cr3+中发现来自于[4A2,4T2]合激发状态的宽带NIR发射.
- 证实了Cr3+-Cr3+交换合相互作用影响T2能量水平,这是由于材料的强烈晶场和密集结构.
- 在LAO:0.15Cr3+.中实现了高的内部量子效率 (80.6%) 和外部量子效率 (30.3%).
- 在高温下表现出极好的发光热稳定性,强度损失最小 (92%在370K,85%在423K).
结论:
- 激发状态的[4A2,4T2]合为LAO:Cr3+中的宽带NIR发射提供了一个新的途径.
- 该材料表现出有希望的热稳定性和高量子效率,使其适合实际应用.
- 制造成转换发光二极管 (pc-LED) 显示了用于夜视和植物照明应用的潜力.
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