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A novel patterned remote phosphor structure enhances white light-emitting diodes (LEDs) for superior color mixing and stability. This design improves angular color uniformity and chromatic stability across a wider current range.

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Area of Science:

  • Solid-state lighting
  • Optoelectronics
  • Materials science

Background:

  • Conventional remote phosphor coatings in white light-emitting diodes (LEDs) face challenges with angular-dependent color uniformity and chromatic stability.
  • Non-uniform phosphor distribution leads to variations in correlated color temperature (CCT) with viewing angle and operating current.

Purpose of the Study:

  • To investigate a patterned remote phosphor structure for enhanced white LED performance.
  • To improve the uniformity of angular-dependent CCT and chromatic stability.
  • To reduce CCT deviation and control stray light within the LED package.

Main Methods:

  • A pulse spray coating method was used to create a patterned phosphor layer with a window region.
  • The patterned phosphor structure was designed to optimize blue light extraction and CCT stability.
  • Experimental and theoretical verifications were performed to validate the design.

Main Results:

  • The patterned remote phosphor structure significantly improved the uniformity of angular-dependent CCT.
  • Chromatic stability was enhanced over a wider operating current range compared to conventional coatings.
  • CCT deviation was reduced from 1320 K to 266 K.
  • Extraction efficiency of blue rays at large angles was increased.
  • Stray blue and yellow light within the package were effectively reduced and controlled.

Conclusions:

  • The patterned remote phosphor structure offers a viable approach to achieve high-efficiency white LEDs with superior color mixing and stability.
  • This design addresses key limitations of conventional remote phosphor coatings, particularly in angular CCT uniformity and chromatic stability.
  • The method provides a pathway for developing advanced LED lighting solutions with improved optical performance.