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Dr.
Mike Weaver, Principal Investigator, mikeweaver@universaldisplay.com
Ms.
Janice K. Mahon, Business Official,
DOE
Grant No. DE-FG02-02ER83565
Amount:
$750,000
Conventional sources of general illumination are relatively
inefficient and produce a significant amount of heat. New
sources of solid state lighting, based on high efficiency phosphorescent organic
light emitting devices (PHOLEDs) offer the potential for significant energy
savings and other environmental benefits. This
project will further develop two novel approaches to use high efficiency PHOLEDs
to produce white lighting sources. The
first approach uses a single dopant electrophosphorescent organic light emitting
device that produces white light through the formation of two distinct monomer
and excimer emitting species. In the
second approach, low-cost, high-efficiency, general illumination OLED light
sources, comprising a series of striped PHOLEDs, will be fabricated. Phase I
demonstrated the technical feasibility of the two novel approaches to produce
white lighting sources. Specifically,
with fabricated striped R-G-B light sources, it was demonstrated that stripe
widths of 2mm appear featureless through a diffuser and that stripe pitches of
0.5mm will not present undesirable features as a lighting source. Also,
a monomer-excimer single dopant white light source achieved greater than 8 lm/W
at 500 cd/m2, and a path to achieve >100 lm/W with PHOLEDs was
designed. Phase II will:
(1) demonstrate a monomer-excimer based white PHOLED light source on a
glass substrate with an efficiency of 20 lm/W at a luminance of 800 cd/m2;
(2) further develop white PHOLED light sources based on a series of monochrome
striped light sources to achieve the same performance; and (3) demonstrate and
deliver 6” x 6” prototype lighting panels based on both striped and
monomer-excimer PHOLED lighting sources.
Commercial Applications and Other
Benefits
as described by awardee: The
technology should enable high efficiency phosphorescent light sources to become
a viable technology for general illumination. It
is anticipated that these improvements will form the basis for the introduction
of commercial OLED lighting products.