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Room temperature photoluminescence from ZnO quantum wells grown on (0001) sapphire using buffer assisted pulsed laser deposition

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4 Author(s)
Misra, P. ; Laser Program, Raja Ramanna Center for Advanced Technology, Indore 452 013, India ; Sharma, T.K. ; Porwal, S. ; Kukreja, L.M.

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Efficient room temperature (RT) photoluminescence (PL) is achieved on ZnO multiple quantum wells (MQWs) grown on sapphire by pulsed laser deposition using a buffer assisted growth scheme. Absorption spectra of these MQWs at RT showed the excitonic features entwined with the band edges, which pointed to the excitonic nature of the PL transitions. At RT the band edge of these MQWs shifted from ∼3.36 to 3.78 eV on decreasing the well layer thickness from ∼4 to 1 nm. In the range from 10 K to RT, the PL spectral linewidth increased and the peak shifted monotonically towards red with increasing temperature.

Published in:

Applied Physics Letters  (Volume:89 ,  Issue: 16 )

Date of Publication:

Oct 2006

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