近红外光谱技术在无损检测、生物成像和夜视等领域有着广阔的应用,开发一种小型化、快速响应的宽带近红外光源是其大规模应用的前提。基于近红外荧光粉的转换型发光二极管(NIR pc-LED)由于具有紧凑高效、成本低、寿命长等特点而备受关注。目前,开发高效稳定的宽带近红外发射材料成为该技术的关键。采用高温固相法合成了三方晶系的InBO3∶Cr3+荧光粉,在450nm蓝光的激发下,其实现了700~1100nm的宽带近红外发射。随着Cr3+浓度的增加,荧光粉的发射带出现红移。得到的最佳掺杂浓度为2% Cr3+(摩尔分数),其光学带隙为2.35eV,活化能ΔE为0.53eV。将荧光粉与蓝光芯片结合,构筑了具有宽带发射的NIR pc-LED器件。以该LED作为近红外光源,证实了其在生物医学成像和食品检测等领域的潜在应用前景。
The near-infrared (NIR) spectroscopy technology has broad applications in fields such as non-destructive testing,biomedical imaging,and night vision.The development of a compact and rapidly responsive broadband NIR light source is essential for its large-scale utilization.The near-infrared phosphor-based conversion light emitting diode (NIR pc-LED) has attracted considerable attention due to its compactness and high efficiency,low cost,and long lifespan characteristics.At present,the development of efficient and stable broadband NIR emitting materials has become the key to this technology.In this work,InBO3∶Cr3+ phosphors with tripartite crystal system were synthesized by high-temperature solid-phase method,and these phosphors achieved broadband near-infrared emission from 700 to 1100nm under the excitation of 450nm blue light.With the increase of Cr3+ concentration,the emission band of the phosphors exhibited a red-shift.The optimal doping concentration of 2mol% Cr3+ was obtained with an optical band gap of 2.35eV and an activation energy ΔE of 0.53eV.NIR pc-LED devices with broadband emission were constructed by combining the phosphor with a blue chip.Using this LED as a NIR light source,it was confirmed that it had potential applications in the fields of biomedical imaging and food detection.
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基金资助
国家自然科学基金(12104415);中国博士后基金面上项目(2022M721301);河南省科技项目(232102231057)
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