Recent developments in solid state lighting technology around the world

At present, considerable progress has been made in the field of solid-state lighting. Since the Ministry of Energy vigorously developed solid-state lighting technology in 2000, it has supported many R&D projects and achieved many achievements.

First, the United States

At present, considerable progress has been made in the field of solid-state lighting. Since the Ministry of Energy vigorously developed solid-state lighting technology in 2000, it has supported many R&D projects and achieved many achievements. The following are the important results achieved:

In September 2008, CRRE developed a standard cool white light-emitting diode with an efficiency of 107 lm/W @350 mA.

In September 2008, the University of Florida demonstrated a blue-phosphorescent OLED with a lumen efficiency of 40 lumens per watt and an external peak quantum efficiency of 25%. No external light extraction technology is used.

In June 2008, Philips and CREE jointly developed a warm white multi-chip LED aluminized reflector with an efficiency of 69 lm/W and capable of emitting 681 lumens of luminous flux.

In June 2008, UniversalDisplay demonstrated an OLED with a lifetime of 80,000 hours. The efficiency of the OLED is 50 lm/W@1,000 cd/m2.

In June 2008, UniversalDisplay demonstrated a white phosphorescent OLED with a lumen efficiency of 102 lm/W @1000 cd/m2.

In September 2007, CREE developed an LED array with an efficiency of 95 lm/W @350 mA.

In September 2007, GE Global Research Center developed a solution-processed white OLED device with a total power conversion efficiency peak of over 14%. The future goal is to develop a 45 lm/W lighting-grade OLED that will allow incandescent lamps to be replaced in some applications in the near future.

In September 2007, UniversalDisplay produced a 6-square-inch OLED panel that produced 100 lumens of brightness with an efficiency of 31 lm/W and a brightness of 3,000 nits. Brighter than current fluorescent lights.

In June 2007, Kodak developed a new white OLED device with an extraction efficiency of 46%, which is a significant improvement over previous devices.

1.1.1 Recent research highlights

CREE makes cool white LED efficiency up to 107Lm/W

In September 2008, CREE successfully developed a cool white LED with an efficiency of 107 lm/W @350 mA. The results came from CREE's EZBright® LED chip platform and was funded by the Department of Energy. Part of the Department of Energy's Photonic Crystal Chips program, the goal of this project is to improve light extraction rates and develop new packaging technologies that result in higher down-conversion efficiency than traditional LEDs. The LED has a square millimeter, a color temperature of 5500K, and a color rendering index of 73. It integrates four LED chips in a single module package to produce a luminous flux of more than 450 lumens.


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