Strategies to approach high performance in Cr3+-doped phosphors for high-power NIR-LED light sources

Abstract Broadband near-infrared (NIR)-emitting phosphors are key for next-generation smart NIR light sources based on blue LEDs. To achieve excellent NIR phosphors, we propose a strategy of enhancing the crystallinity, modifying the micromorphology, and maintaining the valence state of Cr 3+ in Ca 3 Sc 2 Si 3 O 12 garnet (CSSG). By adding fluxes and sintering in a reducing atmosphere, the internal quantum efficiency (IQE) is greatly enhanced to 92.3%. The optimized CSSG:6%Cr 3+ exhibits excellent thermal stability. At 150 °C, 97.4% of the NIR emission at room temperature can be maintained. The fabricated NIR-LED device emits a high optical power of 109.9 mW at 520 mA. The performances of both the achieved…

• GS
  Georgia Southern University
• CA
  Chinese Academy of Sciences

  Award: FJCXY18040203
• NS
  Natural Science Foundation of Shanxi Province

  Awards: 201801D121020, 201801D221132
• TU
  Taiyuan University of Technology
• UO
  University of Chinese Academy of Sciences
• NK
  National Key Research and Development Program of China

  Awards: 2016YFC0104502, 2017YFC0111602
• FI
  Fujian Institute of Innovation, Chinese Academy of Sciences