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Photoreceptors and Visual Pathways01:22

Photoreceptors and Visual Pathways

At the molecular level, visual signals trigger transformations in photopigment molecules, resulting in changes in the photoreceptor cell's membrane potential. The photon's energy level is denoted by its wavelength, with each specific wavelength of visible light associated with a distinct color. The spectral range of visible light, classified as electromagnetic radiation, spans from 380 to 720 nm. Electromagnetic radiation wavelengths exceeding 720 nm fall under the infrared category, whereas...

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Absolutely Structural Disorder Boosting Bandwidth toward Full-Spectrum White Light from Single Occupancy of

Hongzhi Zhang1, Hong Li1, Junpeng Li1

  • 1Yunnan Key Laboratory of Electromagnetic Materials and Devices, National Center for International Research on Photoelectric and Energy Materials, School of Materials and Energy, Yunnan University, Kunming, 650091, China.

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Researchers developed a new disordered phosphor for stable, full-spectrum white light in LEDs. This single-emitting center phosphor avoids color shifts, enhancing LED performance and longevity.

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Area of Science:

  • Materials Science
  • Solid-State Chemistry
  • Optical Engineering

Background:

  • Single-phase full-spectrum white light (SFWL) phosphors are crucial for simplifying white-LED assembly and ensuring long-term color stability.
  • Existing SFWL phosphors often exhibit chromaticity drift due to inconsistent thermal quenching across multiple emitting centers.
  • Developing SFWL phosphors with a single emitting center is a key challenge to overcome color instability.

Purpose of the Study:

  • To establish a structural disorder strategy for creating a single-emitting center-based SFWL phosphor.
  • To investigate the relationship between structural disorder and the luminescent properties of Bi3+-doped YTaO materials.
  • To demonstrate the enhanced color stability of the developed SFWL phosphor under varying temperatures and operational conditions.

Main Methods:

  • Synthesis of YTaO:Bi3+ phosphors with varying degrees of structural order/disorder by controlling flux addition.
  • Characterization of crystal structure using STEM-HAADF (Scanning Transmission Electron Microscopy-High-Angle Annular Dark-Field) imaging.
  • Optical measurements including photoluminescence spectra, thermal quenching, and white-light performance evaluation in a prototype LED.

Main Results:

  • A transition from ordered Y0.75Ta0.25O1.75:Bi3+ to disordered Y0.785Ta0.215O1.715:Bi3+ was achieved by precisely controlling flux.
  • The disordered Y0.785Ta0.215O1.715:Bi3+ phosphor exhibits SFWL with a broad emission band (FWHM of 6194 cm-1 or 175 nm) from a single activator site.
  • The SFWL phosphor demonstrates exceptional thermal stability with zero chromaticity shift and stable warm white light emission in a prototype LED under various conditions.

Conclusions:

  • Structural disorder is an effective strategy for designing single-emitting center SFWL phosphors with superior color stability.
  • The disordered Y0.785Ta0.215O1.715:Bi3+ phosphor offers a promising solution for advanced white-LED applications requiring high performance and reliability.
  • This work highlights the potential of manipulating crystal structures to achieve advanced optical materials.