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Low-energy Cathodoluminescence for OxyNitride Phosphors
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Next-Generation Short-Wave Infrared LED Phosphors Based on Chromium Doped Rare Earth Sulfides.

Shanshan Li1, Ge Zhu1, Xufeng Zhou2

  • 1Key Laboratory of New Energy and Rare Earth Resource Utilization of State Ethnic Affairs Commission, Key Laboratory of Photosensitive Materials & Devices of Liaoning Province, School of Physics and Materials Engineering, Dalian Minzu University, Dalian, P. R. China.

Advanced Materials (Deerfield Beach, Fla.)
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Summary

New sulfide phosphors (NaLnS₂: Cr³⁺) offer high external quantum efficiency (EQE) and thermal stability for short-wave infrared (SWIR) applications. These materials enable advanced photonic devices like palm vein recognition systems.

Keywords:
pc‐LEDshort‐wave infraredsulfide phosphors

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Area of Science:

  • Materials Science
  • Photonics
  • Solid-State Chemistry

Background:

  • External quantum efficiency (EQE) and thermal stability are crucial for short-wave infrared (SWIR) phosphor-converted light-emitting devices (pc-LEDs).
  • Developing SWIR phosphors with both high EQE and excellent thermal stability presents a significant challenge.

Purpose of the Study:

  • To develop high-performance tunable SWIR-emitting sulfide phosphors.
  • To investigate the potential of NaLnS₂: Cr³⁺ (Ln = Lu, Y, Gd) for advanced photonic applications.

Main Methods:

  • Synthesized NaLnS₂: Cr³⁺ (Ln = Lu, Y, Gd) sulfide phosphors.
  • Leveraged strong covalency, low phonon energy, and structural symmetry of sulfides.
  • Characterized SWIR emission properties, EQE, and thermal stability.

Main Results:

  • Achieved tunable SWIR emission peaking at 980, 1020, and 1080 nm.
  • NaLuS₂: Cr³⁺ exhibited a record high EQE of 61.55% with superior thermal stability.
  • NaGdS₂: Cr³⁺ showed an EQE of 48.55% at 1080 nm.
  • Developed SWIR pc-LEDs with high output power (169.2 mW@350 mA).

Conclusions:

  • NaLnS₂: Cr³⁺ phosphors provide an effective platform for high-performance SWIR emitters.
  • Demonstrated successful applications in palm vein recognition and portable non-destructive detection.
  • Offers new insights for developing advanced SWIR materials for photonic applications.