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Photoluminescence spectra of zno microspheres: effects of exciton-polariton and Purcell factor

Published online by Cambridge University Press:  04 July 2019

Ching-Hang Chien  and
Yia-Chung Chang
Ching-Hang Chien
Affiliation:
Research Center for Applied Sciences, Academia Sinica, Taipei 115, Taiwan Nano Science and Technology Program, TIGP, Academia Sinica, Taipei 115, Taiwan Department of Engineering and System Science, National Tsing Hua University, Hsinchu 300, Taiwan
Yia-Chung Chang*
Affiliation:
Research Center for Applied Sciences, Academia Sinica, Taipei 115, Taiwan
*
*(Email: ychang1@yahoo.com)
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Abstract

We present theoretical calculations of the line shapes of emission spectra of ZnO micro spheres (MSs), including the exciton-polariton and Purcell effect. Our calculation explains the red shift of emission peaks of whispering gallery modes (WGMs) in UV range commonly observed in ZnO MSs. We show that the red shift of the UV emission peak is caused by the combination of cavity effect and the polariton dispersion. The positions and relative strengths of sharp peaks arising from WGMs are also simulated by our calculation, and theoretical predictions match well with experimental data. Our calculation provides useful guide lines for the design of MS cavities for applications in white-light illumination, optical communication, and biosensing.

Keywords

luminescencemicrostructureoptical propertiessimulation
Type
Articles
Information
MRS Advances , Volume 4 , Issue 31-32: Electronics and Photonics , 2019 , pp. 1759 - 1767
Copyright
Copyright © Materials Research Society 2019 

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References

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