Journal
MRS BULLETIN
Volume 34, Issue 2, Pages 101-107Publisher
MATERIALS RESEARCH SOC
DOI: 10.1557/mrs2009.28
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Funding
- Solid State Lighting and Display Center (SSLDC) of UCSB
- JST (Japan Science and Technology Agency)
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The continuous improvement in luminous efficacy of white light-emitting-diode (LED) sources offers the potential of considerable energy savings in general lighting applications. Recent experiments at UCSB have demonstrated 117 lumens per watt (m/W) in white LEDs, with further improvements expected in the near future. Considerable progress has also been achieved using nonpolar GaN, such as a-plane {1120} and m-plane {1100} GaN, or semipolar GaN substrates. Such devices avoid the deleterious effects of charge separation due to spontaneous and piezoelectric polarization inherent in most c-axis oriented devices.
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