76
Synthesis
& Integration of Quantum Confined Atom (QCA) Nanophosphor Based Down
Converter for AlInGaN-Based High Luminous Efficiency White-Light LED
Lamps--Nanocrystals
Technology, Ltd., 101 Woodward Hall (Pace Campus), 235 Elm Road, Briarcliff
Manor, NY 10510-0307;
914-923-1142
Dr.
Rameshwar N. Bhargava, Principal Investigator, rbhargava@nanocrystals.com
Dr.
Rameshwar N. Bhargava, Business Official, rbhargava@nanocrystals.com
DOE
Grant No. DE-FG02-02ER83516
Amount:
$99,933
When
UV/Blue LEDs are downconverted to white light, the best luminous efficiency is
reported to be in the range of 25 to 45 lumens/watt (lm/W). This can be
increased to 75 lm/W by using three individual blue, green, and red LEDs, but
this is expensive. For white light LED lamps to be widely accepted, the cost of
the lamps must be reduced by 10 times while still providing a luminous
efficiency of 75 lm/W. To date, the low downconversion efficiency of existing
phosphors has prevented the achievement of this goal.
This project will utilize a new class of downconverter nanophosphors to
efficiently absorb UV/Blue light and simultaneously downconvert to white light.
When fully optimized, the nanophosphors are expected to increase white light
emission by 100%, bringing the luminous out-put of UV/Blue LEDs to 75
lm/W. Phase I will develop Quantum
Confined atom-based nanophosphors for excitation in the range 370 to 450
nm. Both line-emitter and broadband nanophosphors will be provided. The
Synthesis and Integration of Quantum Confined Atom (QCA) Nanophosphor based
Downconverter for AlInGaN based High Luminous Efficiency White-Light LED
Lamps would help us to achieve the targeted luminous efficiency of 75 lm/W.
Commercial
Applications and Other Benefits as described by the awardee:
The high down conversion efficiency of quantum confined atom based
nanophosphors should lead to an inexpensive LED package that would reduce the
cost of white LED lamps considerably without sacrificing performance.
Return to Abstracts' Table of Contents