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Current Status of GaN-Based Solid-State Lighting

  • Shuji Nakamura

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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1Feezell, D.F., Schmidt, M.C., Farrell, R.M., Kim, K.-C., Saito, M., Fujito, K., Cohen, D. A., Speck, J.S., DenBaars, S.P., Nakamura, S., Jpn. J. Appl. Phys. 46, L284 (2007).
2Tyagi, A., Lin, Y.-D., Cohen, D.A., Saito, M., Fujito, K., Speck, J.S., DenBaars, S.P., Nakamura, S., Appl. Phys. Express 1, 091103 (2008).
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7Fujii, T., David, A., Gao, Y., Iza, M., DenBaars, S.P., Hu, E.L., Weisbuch, C., Nakamura, S., Phys. Status Solidi C 2, 2836 (2005).
8Schmidt, M.C., Kim, K.-C., Sato, H., Fellows, N., Masui, H., Nakamura, S., Denbaars, S.P., Speck, J.S., Jpn. J. Appl. Phys. 46, L126 (2007).
9Steigerwald, D.A., Bhat, J.C., Collins, D., Fletcher, R.M., Holcomb, M.O., Ludowise, M.J., Martin, P.S., Rudaz, S.L., IEEE J. Sel. Top. Quantum Electron. 8, 310 (2002).
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11Chakraborty, A., Haskell, B.A., Keller, S., Speck, J.S., DenBaars, S.P., Nakamura, S., Mishra, U.K., Appl. Phys. Lett. 85, 5143 (2004).
12Chakraborty, A., Haskell, B.A., Keller, S., Speck, J.S., Denbaars, S.P., Nakamura, S., Mishra, U.K., Jpn. J. Appl. Phys. 44, L173 (2005).
13Schmidt, M.C., Kim, K.-C., Farrell, R.M., Feezell, D.F., Cohen, D.A., Saito, M., Fujito, K., Speck, J.S., DenBaars, S.P., Nakamura, S., Jpn. J. Appl. Phys. 46, L190 (2007).

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Current Status of GaN-Based Solid-State Lighting

  • Shuji Nakamura

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