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      Confocal photoluminescence investigation to identify basal stacking fault’s role in the optical properties of semi-polar InGaN/GaN lighting emitting diodes

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          Abstract

          High spatial-resolution confocal photoluminescence (PL) measurements have been performed on a series of semi-polar (11–22) InGaN light emitting diodes (LEDs) with emission wavelengths up to yellow. These LED samples have been grown on our high crystal quality semi-polar GaN templates which feature periodically distributed basal stacking faults (BSFs), which facilitates the study of the influence of BSFs on their optical performance. Scanning confocal PL measurements have been performed across BSFs regions and BSF-free regions. For the blue LED, both the emission intensity and the emission wavelength exhibit a periodic behavior, matching the periodic distribution of BSFs. Furthermore, the BSF regions show a longer emission wavelength and a reduced emission intensity compared with the BSF-free regions. However, with increasing indium content, this periodic behavior in both emission intensity and emission wavelength becomes weaker and weaker. When the indium content (and correspondingly, wavelength) increases up to achieve yellow emission, only random fluctuations have been observed. It is worth highlighting that the influence of BSFs on the optical properties of semi-polar InGaN LEDs is different from the role of dislocations which normally act as non-radiative recombination centers.

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          Direct Evidence that Dislocations are Non-Radiative Recombination Centers in GaN

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            Emission properties of a-plane GaN grown by metal-organic chemical-vapor deposition

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              A review of gallium nitride LEDs for multi-gigabit-per-second visible light data communications

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                Author and article information

                Contributors
                t.wang@sheffield.ac.uk
                Journal
                Sci Rep
                Sci Rep
                Scientific Reports
                Nature Publishing Group UK (London )
                2045-2322
                5 July 2019
                5 July 2019
                2019
                : 9
                : 9735
                Affiliations
                ISNI 0000 0004 1936 9262, GRID grid.11835.3e, Department of Electronic and Electrical Engineering, , University of Sheffield, ; Mappin Street, Sheffield, S1 3JD United Kingdom
                Author information
                http://orcid.org/0000-0002-7718-7796
                http://orcid.org/0000-0002-6953-4698
                Article
                46292
                10.1038/s41598-019-46292-8
                6611846
                31278338
                07a44c7c-2a4b-4f6f-8b63-4141c44c20af
                © The Author(s) 2019

                Open Access This article is licensed under a Creative Commons Attribution 4.0 International License, which permits use, sharing, adaptation, distribution and reproduction in any medium or format, as long as you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license, and indicate if changes were made. The images or other third party material in this article are included in the article’s Creative Commons license, unless indicated otherwise in a credit line to the material. If material is not included in the article’s Creative Commons license and your intended use is not permitted by statutory regulation or exceeds the permitted use, you will need to obtain permission directly from the copyright holder. To view a copy of this license, visit http://creativecommons.org/licenses/by/4.0/.

                History
                : 21 December 2018
                : 26 June 2019
                Funding
                Funded by: FundRef https://doi.org/10.13039/501100000266, RCUK | Engineering and Physical Sciences Research Council (EPSRC);
                Award ID: EP/M015181/1
                Award ID: EP/M015181/1
                Award ID: EP/L017024/1
                Award ID: EP/M015181/1
                Award ID: EP/L017024/1
                Award Recipient :
                Categories
                Article
                Custom metadata
                © The Author(s) 2019

                Uncategorized
                inorganic leds,nanophotonics and plasmonics
                Uncategorized
                inorganic leds, nanophotonics and plasmonics

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