Single-Phase Full-Color Phosphor for LEDs

Tech ID: 28897 / UC Case 2013-088-0

Brief Description

Researchers at the University of California, Santa Barbara have developed a novel inorganic luminescent material that exhibits three strong emission bands in the visible region (blue, green, and red) when excited by near-UV light.

Background

The use of incandescent bulbs and compact fluorescent lamps (CFL) is largely inefficient and associated with high operating costs. Solid-state devices are a promising alternative to white light generating applications because the light-emitting diodes in these systems emit light due to electroluminescence rather than thermal radiation. Current white light solid-state devices produce a “cool” white light that appears blue-ish to the human eye, due to the lack of red emission. There is a need for a phosphor that can efficiently emit light in the entire visible region (blue, green and red).

Description

Researchers at the University of California, Santa Barbara have developed a novel inorganic luminescent material that exhibits three strong emission bands in the visible region (blue, green, and red) when excited by near-UV light. By varying the dopant ions in the material, almost white light emission from a single material can be obtained, circumventing the need to blend different phosphors when using near-UV LEDs as the excitation source. Single-phase materials are also associated with better color and chemical stability compared to blended materials.

Advantages

  • Improved luminous efficiency and color rendering index
  • Improved color and chemical stability
  • Lower operating costs

Applications

  • Solid-state lighting
  • LEDs

Patent Status

Country Type Number Dated Case
United States Of America Issued Patent 9,228,125 01/05/2016 2013-088
 

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Keywords

indled, indfeat, LED, Light Emitting Diodes, Phosphor, Solid State Lighting, UV light

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