Enhanced internal quantum efficiency in non-polar ZnO/Zn sub(0.81) Mg sub(0.19) O multiple quantum wells by Pt surface plasmons coupling

Non-polar-oriented ZnO/Zn sub(0.81) Mg sub(0.19) O multiple quantum wells (MQWs) were grown on r-plane sapphire substrates by plasma-assisted molecular beam epitaxy. The internal quantum efficiency ([eta] sub(int)) of the non-polar MQWs was only 1.8%. The degraded quality of non-polar MQWs is the ma...

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Bibliographic Details
Published in:Optics letters 2015-08, Vol.40 (15), p.3639-3642
Main Authors: Chen, Shanshan, Pan, Xinhua, He, Haiping, Chen, Wei, Huang, Jingyun, Lu, Bin, Ye, Zhizhen
Format: Article
Language:English
Subjects:
Coupling
Emission
Nanoparticles
Plasmons
Quantum efficiency
Quantum wells
Sputtering
Zinc oxide
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Summary:Non-polar-oriented ZnO/Zn sub(0.81) Mg sub(0.19) O multiple quantum wells (MQWs) were grown on r-plane sapphire substrates by plasma-assisted molecular beam epitaxy. The internal quantum efficiency ([eta] sub(int)) of the non-polar MQWs was only 1.8%. The degraded quality of non-polar MQWs is the main factor for the low [eta] sub(int). Besides improving the quality of non-polar MQWs, an effective way to enhance the UV emission of the non-polar MQWs by sputtering Pt nanoparticles has been used. Employing the resonant coupling between UV emission from the MQWs and Pt nanoparticle surface plasmons (SPs), a 20-fold enhancement of the UV emission has been achieved under the optimized sputtering time. Moreover, the [eta] sub(int) value of the non-polar MQWs has been strongly improved with the help of Pt. 6.7-fold enhancement of [eta] sub(int) has been achieved due to SPs coupling. It paves a new way in designing highly efficient non-polar LEDs.
ISSN:0146-9592
1539-4794
DOI:10.1364/OL.40.003639