Abstract
NIR-emitting (YAB:Cr/Yb) and (BSSO:Cr) phosphors were demonstrated as luminescent converters for broadband NIR phosphor-converted LEDs (pc-LEDs). YAB:Cr/Yb phosphors show emissions in 670–800 nm ( emission) and 950–1050 nm ( emission) upon excitation at 450 nm. In the BSSO host, ions occupy sites with relatively weak crystal field, and thus a broadband emission at longer wavelengths of 750–950 nm is found for BSSO:Cr phosphors. Moreover, temperature-dependent spectral studies indicate that both YAB:Cr/Yb and BSSO:Cr phosphors exhibit good thermal stability, and more than 80% of the initial emission intensities can be sustained at 150°C. A NIR pc-LED prototype was fabricated by integrating these two phosphors with a blue LED chip (), which generated a broadband emission in the NIR spectral range from 780 to 1050 nm. A NIR light output power of was achieved at the injection current of 100 mA, with the corresponding energy conversion efficiency of .
© 2018 Optical Society of America
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