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

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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, Yb3+ doped CsPbCl3 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 CsPbCl3: Yb3+ NCs is limited by their poor thermal stability. In this work, we present a high-temperature stable, melt-grown CsPbCl3: Yb3+ single crystal (SC) and narrowband NIR pc-LEDs fabricated from CsPbCl3: Yb3+ 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 CsPbCl3: Yb3+ crystal for diverse applications.