Cr3+掺杂CaLu2Al4SiO12宽带近红外荧光材料发光性能与器件研究

Luminescence Properties of Cr3+-Doped CaLu2Al4SiO12 Broadband Near-Infrared Phosphors and the LED Device

摘要:

近红外光谱技术在食品质量检测与分析、夜视、生物组织成像、植物生长调控等领域有重要的应用价值，宽带近红外光源在这些应用中起着重要的作用，而通过荧光材料转换实现宽带近红外LED光源有着不可比拟的优势。采用高温固相法制备了CaLu_2-xAl₄SiO₁₂:xCr³⁺（x=1%—13%）荧光粉。研究结果表明，CaLu_2-x Al₄SiO₁₂:xCr³⁺荧光粉在423 nm的蓝光激发下，光谱覆盖了650—1000 nm范围，荧光粉的发射峰值位于752 nm，半高宽有167 nm。当Cr³⁺离子掺杂浓度为5%时，量子效率达到了60.9%。同时，CaLu_2-xAl₄SiO₁₂:xCr³⁺具有良好的热稳定性，在373 K时的发光强度为室温下的60.6%。此外，将CaLu₂Al₄SiO₁₂:Cr³⁺荧光粉与蓝光LED芯片结合，制备成近红外LED器件，在450 mA电流的驱动下，近红外输出功率可以达到22.69 mW。因此，CaLu_2-xAl₄SiO₁₂:xCr³⁺荧光粉在近红外光谱的应用中具有广阔的前景。

Abstract:

Near-infrared （NIR） spectroscopy technique plays an important role in food quality testing and analysis， night vision， biological tissue imaging， and regulation of plant growth filed. Broadband near infrared light source plays an important role in these applications， and near infrared phosphor is a very important part in near infrared light source. In this study， CaLu_2-xAl₄SiO₁₂：xCr³⁺（1%—13%）was fabricated by high temperature solid state method. The experimental results showed that CaLu_2-xAl₄SiO₁₂：xCr³⁺ phosphors can be excited efficiently by 423 nm light and presented a broad emission band covering 650—1000 nm （bandwidth of 167 nm） with a PL quantum yield of 60.9%， which exhibited good emission thermal stability， 60.6% of room temperature intensity at 373 K. In addition， an efficient NIR pc-LED was fabricated and showed NIR output of 22.69 mW@450 mA. These results suggest that the CaLu_2-xAl₄SiO₁₂：xCr³⁺ is a promising candidate for broadband pc-LED in NIR spectroscopy applications.