Date: 14th July 2011
White organic LEDs with light output capability
of 60 lumens/watt
Novaled has announced it has developed a highly power-efficient
white OLED (Organic LED) structure delivering light output
of 60 lm/W at a brightness of 1,000 cd/m2. These LED can
long laster with lifetime of 100,000 hours at an initial
brightness of 1,000 cd/m2 while using commercially available
fluorescent blue emitting material.
The color rendering index (CRI) is also tested high of
87 for these LEDs. A very broad light emission spectrum
and good CIE color coordinates (0.470/0.429) were achieved,
which is close to illuminant A and inside the US Department
of Energy (DOE) quadrangles meeting the DOE energy star
color specifications, says Novaled.
Novaled said it has intentionally used a classical and
commercially available fluorescent blue emitter material
although the OLED power efficiency with such materials is
usually much less than with phosphorescent emitters, but
due to the advantages of the Novaled PIN OLED technology
and proprietary materials a remarkably high value could
be reached, claims Novaled.
The benefits of using fluorescent blue emitter material
include:
It is commercially available;
It allows very good device stability and guarantees a higher
lifetime of OLED devices;
Enables a broad coverage of the complete visible color range.
Novaled says the OLED sample incorporates Novaled light
extraction technology and dedicated material NET 61 thereby
enhancing the efficiency and improving the angular dependence
of emitted light. By meeting the standards for commercial
lighting applications, Novaled's new power-efficient white
PIN OLEDs are already ideal for OLED lamps and luminaires
for general and design lighting, suggests Novaled.
"Associating commercially available and robust fluorescent
blue emitters with Novaled technology and materials leads
to high OLED performances which meet major lighting market
needs immediately", says Gildas Sorin, CEO of Novaled
AG. "Once phosphorescent blue emitter materials become
real commercial products our technology will allow for a
further boost in OLED device efficiencies showing the way
to exceed above 100lm/w and long life time."
Novaled said it has manufactured using standard processes
to produce the white PIN OLED device structures. Standard
glass substrates with ITO, ordinary evaporation processes
and simple outcoupling methods allow for an easy adoption
to existing manufacturing lines and for a cost efficient
volume production of such devices, adds Novaled.
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