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. 2016 Oct 4;6:34086. doi: 10.1038/srep34086

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Copyright © 2016, The Author(s)

This work is licensed under a Creative Commons Attribution 4.0 International License. The images or other third party material in this article are included in the article’s Creative Commons license, unless indicated otherwise in the credit line; if the material is not included under the Creative Commons license, users will need to obtain permission from the license holder to reproduce the material. To view a copy of this license, visit http://creativecommons.org/licenses/by/4.0/

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PL intensity from the stratified (a,c) and single layer (b,d) structures for single/stratified layer-acceptor (red) and donor-single/stratified layer-acceptor (blue) samples. In the single layer structure the thickness of silver film and in the stratified samples the metal-spacer-metal thickness is 60 (c,d) and 90 nm (a,b). The excitation source is 405 nm. The stratified samples show the higher SP-NRET efficiency and absolute photoemission compared to the single layer structures.