High-Temperature Stable Narrowband Near-Infrared Phosphor-Converted Light-Emitting Diode Based on Melt-Grown CsPbCl3: Yb3+ Crystal

en Narrowband near-infrared (NIR) phosphor-converted light-emitting diodes (pc-LEDs) featuring low full-width at half maximum (FWHM) and high conversion efficiency are crucial for chemical content evaluation, light therapy, and bioimaging. Recently, Yb 3+ doped CsPbCl 3 nanocrystals (NCs) have emerged as promising phosphors for NIR pc-LEDs, delivering narrowband 980 nm emission with an FWHM below 50 nm and a photoluminescence quantum yield (PLQY) exceeding 100%. However, the practical employment of CsPbCl 3 : Yb 3+ NCs is limited by their poor thermal stability. In this work, we present a high-temperature stable, melt-grown CsPbCl 3 : Yb 3+ single crystal (SC) and narrowband NIR pc-LEDs fabricated from CsPbCl 3 : Yb 3+ powder and violet LED chips. Our pc-LEDs achieve a low FWHM of 46.81 nm and a high conversion efficiency of 2.44% at a drive current of 20 mA. More importantly, our pc-LEDs exhibit exceptional thermal stability, retaining 98.2% of their PL emission intensity at 360 K. Finally, these NIR pc-LEDs successfully demonstrate applications in night vision, vein imaging, non-destructive testing, and the detection of early fruit bruises. This work underscores the significant potential of narrowband 980 nm pc-LEDs based on CsPbCl 3 : Yb 3+ crystal for diverse applications. 摘要 zh 具有窄半峰全宽和高转换效率的窄带近红外荧光粉转换发光二极管在化学成分分析、光疗及生物成像等领域具有关键应用价值。近年来,Yb 3+ 掺杂CsPbCl 3 纳米晶已经成为近红外荧光粉转换发光二极管的潜在荧光材料,其可实现980 nm窄带发射,低于50 nm的半峰全宽和超过100%光致发光量子产率。然而,CsPbCl 3 : Yb 3+ 纳米晶的热稳定性较差,严重限制了其实际应用。本研究通过熔融生长法制备了高温稳定的CsPbCl 3 : Yb 3+ 单晶,并利用CsPbCl 3 : Yb 3+ 粉末与紫光发光二极管芯片制备了窄带近红外荧光粉转换发光二极管。在20 mA驱动电流下,该荧光粉转换发光二极管的半峰全宽低至46.81 nm,转换效率高达2.44%。更重要的是,其展现出优异的热稳定性,在360 K环境下仍能保持98.2%的光致发光强度。最后,该近红外荧光粉转换发光二极管在夜视成像、静脉探测、无损检测及水果早期损伤识别等场景中实现了成功应用。本研究证实,基于CsPbCl 3 : Yb 3+ 晶体的980 nm窄带近红外荧光粉转换发光二极管在相关领域具有广泛的应用前景。