Ultraviolet emission from a diamond pn junction.

@article{Koizumi2001UltravioletEF,
  title={Ultraviolet emission from a diamond pn junction.},
  author={S. Koizumi and Kei Watanabe and Manabu Hasegawa and Hiroki Kanda},
  journal={Science},
  year={2001},
  volume={292 5523},
  pages={
          1899-901
        }
}
We report the realization of an ultraviolet light-emitting diode with the use of a diamond pn junction. The pn junction was formed from a boron-doped p-type diamond layer and phosphorus-doped n-type diamond layer grown epitaxially on the 111 surface of single crystalline diamond. The pn junction exhibited good diode characteristics, and at forward bias of about 20 volts strong ultraviolet light emission at 235 nanometers was observed and was attributed to free exciton recombination. 

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