Technologies | LEDs | Light Extraction | Jun 12, 2017

Innovation Extends the Lumen Extraction Limits of RGB and White LEDs in Excess of 53%

EVATEG Energy Efficient Electronics and Lighting Technologies Center recently demonstrated a new optical extraction technology for RGB and phosphor coated LEDs to extend the limits over 53%.

This new technology has been studied over the last 6 years with a group of researchers under Dr. Mehmet Arik of Ozyegin University who has over 17 years of experience including 11 years at GE Global Research Laboratories in New York, USA. While conventional LED packages consist of silicone-phosphor mixture over the chip, causing some significant optical losses due to refractive index mismatching, local heat transfer as well as local phosphor heating issues; EVATEG’s novel idea enhances the light extraction by appliying the phosphor away from the chip with remote coating under glass dome and decreases the junction temperature with optothermal liquid cooling technologies. The system an extensive comparison between the baseline (conventional LED packages) with air filled, fully silicone cured and optothermal fluid filled seperately has shown an increase over the lumen output as %23, %40 and %53 over the baseline respectively.

Furthermore, this novel idea brings the following key advantages over conventional approaches:

  • Provides an effective cooling of LED light engines abating local temperature non-uniformities
  • Simplifies complex lighting system designs
  • Reduces the thermal resistance between the chip and heat sink significantly and leads to high lumen extraction
  • Key enabler technology for advanced IoT features for lighting systems
  • Lowers the junction temperature with an effective cooling of chip and phosphor while increasing the lumen output and lifetime
  • Higher conversion efficiency in phosphor with decreasing temperature
  • Eliminates color shifts due to temperature overshoots
  • Enables a better refractive index matching reducing optical losses

 

https://www.ozyegin.edu.tr/en

www.evateg.com

FEATURED

LumiTop 4000: Comprehensive Optical Wafer Testing for μLEDs

LumiTop 4000: Comprehensive Optical Wafer Testing for μLEDs Instrument Systems offers a unique camera-based measurement solution for μLED wafer testing that generates 2-dimensional, pixel-resolved optical analyses within given cycle times. The LumiTop 4000 has a resolution of 12 MP and can detect the smallest of defects and inhomogeneities on the wafer. ... Read more »

FEATURED

Lumileds Maximizes Field Usable Lumens: New LUXEON HL2X LED

Lumileds Maximizes Field Usable Lumens: New LUXEON HL2X LED Lumileds introduces the LUXEON HL2X, the ideal choice for roadway lighting and sports lighting fixtures with the highest flux and efficiency in an industry standard package. "With 318+ lumens at 700 mA and 85°C, LUXEON HL2X delivers more 'field usable lumens' for optical engineers to work with. ... Read more »

EDITORIAL

Australian Associated Press Recently Wrote: Red Light Could Improve Over-40s' Eyesight

Australian Associated Press Recently Wrote: Red Light Could Improve Over-40s' Eyesight A small LED torch that emits deep red light could help improve declining eyesight, scientists have said: A study by University College London, involving a small sample size of 24 people, has shown that staring at long wavelength light for three minutes every day can "significantly improve vision" ... Read more »

EDITORIAL

Signify Invests to Broaden Its UV-C Lighting Portfolio for Professional Disinfection

Signify Invests to Broaden Its UV-C Lighting Portfolio for Professional Disinfection Signify, the world leader in lighting, is increasing its UV-C lighting production capacity and expanding its UV-C product portfolio. The company is leveraging more than 35 years of expertise in UV-C lighting to address the growing global need for the disinfection of air, surfaces and objects. Read more »