Emission bands of nitrogen-implantation induced luminescent centers in ZnO crystals: Experiment and theory


Emission bands of nitrogen-implantation induced luminescent centers in ZnO crystals: Experiment and theory

Dai, X. M.; Xu, S. J.; Gu, Q. L.; Ling, C. C.; Brauer, G.; Anwand, W.; Skorupa, W.

High quality ZnO crystal with the sharp band-edge excitonic emission and very weak green emission was implanted by nitrogen ions. An additional red emission band was observed in the as-implanted ZnO crystal and investigated as a function of temperature. By employing the underdamped multimode Brownian oscillator model for general electron-phonon coupling system, both the original green and nitrogen-implantation induced red emission bands were theoretically reproduced at different temperatures. Excellent agreement between theory and experiment enables us determine the energetic positions of the pure electronic levels associated with the green and red emission bands, respectively. The determined energy level of the red emission band is in good agreement with the data obtained from the deep-level transient spectroscopic measurements.

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Publ.-Id: 17448