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Current Status of GaN-Based Solid-State Lighting

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Abstract

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 (lm/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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Authors
  1. Shuji Nakamura
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Nakamura, S. Current Status of GaN-Based Solid-State Lighting. MRS Bulletin 34, 101–107 (2009). https://doi.org/10.1557/mrs2009.28

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