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Forestry

Breakthrough in Near-Infrared Phosphor-Converted LEDs

Strategic Insights

— 1 min read

Researchers at Nanjing Forestry University have made a significant discovery in the field of near-infrared phosphor-converted light-emitting diodes (NIR pc-LEDs). The team, led by Yu Xiao, developed a new phosphor, CYZS:Cr3+,Yb3+, which exhibits ultra-broadband emission from 660 to 1100 nm, accompanied by an increase in internal quantum efficiency (IQE) from 78.4 % to 87.3 %. This breakthrough has the potential to revolutionize the development of high-efficiency NIR pc-LEDs.

Key Takeaways:

  • The research was funded by the National Natural Science Foundation of China (NSFC) and the Innovation Training Program for College Students in Nanjing Forestry University.
  • The new phosphor, CYZS:Cr3+,Yb3+, was developed by incorporating Yb3+ into the previously developed high-performance garnet-type phosphor CaY2ZrScAl3O12:Cr3+ (CYZS:Cr3+).
  • The resulting phosphor exhibits ultra-broadband emission, improved internal quantum efficiency, and enhanced thermal stability.
  • The pc-LED device fabricated with CYZS:Cr3+,Yb3+ achieved high output power (62.3 mW @ 150 mA) and photoelectric conversion efficiency (19.7 % @ 10 mA).
  • The research has been peer-reviewed and published in the Journal of Alloys and Compounds.
  • The data used to support the findings of this study are available from the corresponding author upon request.

Statistics:

  • Internal quantum efficiency (IQE) increased from 78.4 % to 87.3 %.
  • Thermal stability was enhanced, as evidenced by the increase in the ratio of emission intensity at 423 K to that at 293 K (I-423 K/I-293 K) from 84.3 % to 96.9 %.
  • Output power achieved by the pc-LED device was 62.3 mW @ 150 mA.
  • Photoelectric conversion efficiency was 19.7 % @ 10 mA.

Sources:

  • Xiao, Y., et al. "Ultra-broadband Nir Garnet Phosphors Cay 2 zrscal 3 o 12 :cr 3+,yb 3+ for High-efficiency Leds." Journal of Alloys and Compounds, vol. 1039, 2025.
  • NewsRx. Researchers' Work from Nanjing Forestry University Focuses on Technology (Ultra-broadband Nir Garnet Phosphors Cay 2 zrscal 3 o 12 :cr 3+,yb 3+ for High-efficiency Leds). Journal of Engineering, October 20, 2025, p 3701.

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