Blue-emitting phosphors
Lighting accounts for 15%of global energy consumption. Replacing traditional lighting with an energy-efficient, phosphor-converted light-emitting diode(pc-LED) is one of the most convenient and affordable methods to drastically decrease energy consumption. Currently, commercially viable phosphors have drawbacks such as degrading upon contact with moisture and being composed of expensive metals. A new blue-emitting phosphor composed of cheap and readily available elements can be synthesized through a one-step reaction which can produce multiple grams of material at once. The phosphor possesses a highly efficient,narrow, and thermally stable blue emission. The emission is unaffected by water and retains its efficiency after prolonged heating. A warm white light can be produced when using a 405 nm LED with the blue phosphor and other appropriate phosphors. Its optical properties make it a highly suitable candidate for LED back lighting or general lighting applications.
Applications
  • Fulfills the need for an efficient, narrow,and thermally stable emission in a scalable package.
  • The blue phosphor emission resists changes in peak shape, position, and full width at half maximum in water for 21 days and up to 300°C. Current commercial materials lose emission intensity with requisite stimuli.
  • Blue phosphor is efficiently excited by a 405nm LED to produce a warm white light in a pc-LED with a red and green component.
Competitive Advantages
  • Scalable production drastically reduces synthesiscost.
    • Formed by a one-step reaction at low temperature.
    • Composed of abundant, readily available elements.
  • More efficient and thermally robust than alternative commercial blue-emitting phosphors.
    • Photoluminescent quantum yield of 93% and 71% under 365 and 400 nm excitation, respectively.
    • 1931 CIE coordinates of (0.152, 0.124).
    • Zero thermal quenching in emission up to 580 K.
  • Allows for the production of white light with a color rendering index of 93 and correlated color temperature of 2710 K when combined with a 405 nm LED, β-SiAlON:Eu2+, and Sr2Si5N8:Eu2+.
  • Broad excitation range allows the technology to be used in a large variety of commercially viable applications.
Patents
  • 63/116,017 (Provisional, Pending)
Case ID
2021-003
Inventor
Jakoah Brgoch
Associate Professor, Chemisty