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Related Concept Videos

Photoluminescence: Applications01:14

Photoluminescence: Applications

367
Photoluminescence offers a wide range of applications due to its inherent sensitivity and selectivity. This technique allows for both direct and indirect analyses of the analyte. Direct quantitative analysis is possible when the analyte exhibits a favorable quantum yield for fluorescence or phosphorescence. However, an indirect analysis may be feasible if the analyte is not fluorescent or phosphorescent, or if the quantum yield is unfavorable. Indirect methods include reacting the analyte with...
367

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Thermally Stable Broadband Cr3+-Doped RbAl3P6O20 Phosphor for Near-Infrared Spectroscopy Applications.

Xiaozhong Wu1,2, Decai Huang1,3,4,2, Qiuming Lin1,2

  • 1College of Rare Earths, Jiangxi University of Science and Technology, Ganzhou 341000, P. R. China.

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A novel near-infrared (NIR) emitting phosphor, RbAl3P6O20: Cr3+ (RAPO: Cr3+), was developed. This material shows promise for advanced NIR phosphor-converted light-emitting diode (pc-LED) applications due to its broadband emission and stability.

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Area of Science:

  • Materials Science
  • Solid-State Chemistry
  • Optoelectronics

Background:

  • Near-infrared (NIR) phosphors are crucial for NIR phosphor-converted light-emitting diodes (pc-LEDs).
  • NIR pc-LEDs offer unique advantages like high penetration and invisibility, making them versatile light sources.
  • The optical properties of NIR phosphors directly influence pc-LED performance.

Purpose of the Study:

  • To develop and characterize a novel broadband NIR-emitting phosphor.
  • To investigate the emission mechanism and optimize the phosphor's properties.
  • To evaluate the performance of the developed phosphor in NIR pc-LED devices.

Main Methods:

  • Synthesis and characterization of RbAl3P6O20: Cr3+ (RAPO: Cr3+).
  • Optical property analysis, including emission spectra and full-width at half-maximum (fwhm).
  • Gaussian fitting to analyze emission origins and thermal stability testing.
  • Fabrication and testing of NIR pc-LED devices using the optimized phosphor.

Main Results:

  • A broadband NIR emission ranging from 650 to 1000 nm, peaking at ~785 nm, was achieved with RAPO: Cr3+.
  • Cr3+ ions occupying two distinct octahedral sites were identified as the source of broadband emission.
  • The optimized RAPO: 0.08Cr3+ showed an internal quantum efficiency of 60% and retained 90% efficiency at 423 K.
  • NIR pc-LED devices demonstrated an output power of 27.9 mW at 120 mA.

Conclusions:

  • RAPO: Cr3+ is a promising broadband NIR-emitting phosphor.
  • The material exhibits excellent thermal stability and high quantum efficiency.
  • This phosphor is well-suited for developing high-performance NIR pc-LED light sources.