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Multiphonon scattering and non‐radiative decay in ZnO nanoparticles

DOI

16

Citations

0

References

2010

Year

Kasilingam Senthilkumar, Masayuki Tokunaga, Hirosi Okamoto, O. Senthilkumar, Jie Lin, Ben E. Urban, Arup Neogi, Yasuhisa Fujita
Physica status solidi. C, Conferences and critical reviews/Physica status solidi. C, Current topics in solid state physics

Abstract

Abstract ZnO nanoparticles were prepared using a simple evaporation technique at pressures of 75 and 760 torr. A wide visible emission was recorded from both samples using photoluminescence spectroscopy. The presence of green emission at 530 nm is due to deep level defects of vacant zinc V Zn , and/or their complexes in the ZnO band gap. The fundamental optical phonon modes were identified in addition to multiphonon combination of optical and acoustical overtones and nitrogen related local vibrational modes using Raman backscattering. The existence of multiphonons induces the non‐radiative processes. The life time of both the radiative and non‐radiative processes is discussed using time resolved photoluminescence spectroscopic results (© 2010 WILEY‐VCH Verlag GmbH & Co. KGaA, Weinheim)