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Quantum confinement induced ultra-high intensity interfacial radiative recombination in nanolaminates

Abstract

Al2O3/ZnO, Al2O3/TiO2, TiO2/ZnO and MgO/ZnO nanolaminates (NLs) were prepared using atomic layer deposition to explore the dependence of luminescent characterizations on sublayer width and constituent. When the ZnO sublayer width is larger than Bohr radius in Al2O3/ZnO NLs, the UV luminescence arising from ZnO is reduced and even quenched with decreasing the ZnO width due to the nonradiative recombination (NR) caused by existence of interface states. While for the ZnO width smaller than Bohr radius, a visible luminescence rather than the UV emission is observed and further enhanced with decreasing the ZnO width. It is also found that the visible luminescence needs a certain width of Al2O3 and is extinguished with the replacement of Al2O3 with TiO2. A theoretical model based on configuration coordination and quantum confinement effect is proposed to understand the physical origin underlying the intriguing optical behaviour. The mechanism has generality and is applicable for other NLs as well, such as Al2O3/TiO2 and MgO/ZnO NLs with ultra-thin sublayers in which similar luminescence enhancements are also observed. This work may provide a promising approach for realizing high performance luminescence with various wavelengths for electro- and photo-luminescent applications in NLs.

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Publication details

The article was accepted on 20 Sep 2017 and first published on 28 Sep 2017


Article type: Paper
DOI: 10.1039/C7NR06564G
Citation: Nanoscale, 2017, Accepted Manuscript
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    Quantum confinement induced ultra-high intensity interfacial radiative recombination in nanolaminates

    J. Li and X. Bi, Nanoscale, 2017, Accepted Manuscript , DOI: 10.1039/C7NR06564G

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