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Violet Laser Diode Enables Lighting Communication.

Yu-Chieh Chi1, Yu-Fang Huang1, Tsai-Chen Wu1

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This study demonstrates a violet laser diode (VLD) based white-light source for communication. Optimized phosphor diffusers achieve high color rendering index (CRI) and data rates, enabling efficient lighting communication.

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Area of Science:

  • Optoelectronics and Photonics
  • Materials Science
  • Optical Communications

Background:

  • Violet laser diodes (VLDs) are explored for generating white light.
  • Phosphor-converted light sources are crucial for high-quality illumination and data transmission.
  • Achieving a balance between color rendering index (CRI), correlated color temperature (CCT), and data rate is a key challenge.

Purpose of the Study:

  • To implement a VLD-based white-light source with a high CRI for lighting communication.
  • To investigate the performance of different phosphor diffuser plates (YAG:Ce and LuAG:Ce/CASN:Eu).
  • To optimize parameters like bias current and phosphor thickness for enhanced light source characteristics and data transmission.

Main Methods:

  • Utilizing YAG:Ce and LuAG:Ce/CASN:Eu phosphor diffuser plates with a VLD.
  • Varying the bias current of the VLD (70 mA, 122 mA, 105 mA) to excite the phosphors.
  • Adjusting phosphor diffuser thickness (0.85 mm, 0.75 mm).
  • Measuring correlated color temperature (CCT), color rendering index (CRI), and data transmission rates.

Main Results:

  • A YAG:Ce diffuser yielded a CCT of 5068 K and CRI of 65 at 4.4 Gbit/s.
  • A 0.85 mm LuAG:Ce/CASN:Eu diffuser produced warm white light (CCT 2700 K, CRI 87.9) at 2.4 Gbit/s.
  • Thinning the LuAG:Ce/CASN:Eu diffuser to 0.75 mm improved CRI to 89.1 and data rate to 4.4 Gbit/s.
  • Increasing bias current to 105 mA resulted in CCT 3023 K and CRI 91.5 at 4.4 Gbit/s.

Conclusions:

  • VLD-based white-light sources using optimized phosphor diffusers can achieve high CRI and significant data rates.
  • Phosphor composition, thickness, and VLD bias current are critical parameters for tuning light source properties.
  • This technology shows promise for advanced lighting communication systems requiring both quality illumination and high-speed data transmission.