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• W2919861387 abstract "Abstract Among the III-nitride semiconductors, In x Ga 1- x N is a key material for visible optical devices such as light-emitting diodes (LEDs), laser diodes, and solar cells. Light emission is achieved via electron-hole recombination within the In x Ga 1- x N layer. When In x Ga 1- x N-based blue LEDs were first commercialized, the high probability of electron-hole radiative recombination despite the presence of numerous threading dislocations was a mystery. Extensive studies have proposed that carrier localization in nanoscopic potential fluctuations due, for example, to the immiscibility between InN and GaN or random alloy fluctuations is a key mechanism for the high emission efficiency. In actual LED devices, not only nanoscopic potential fluctuations but also microscopic ones exist within the In x Ga 1- x N quantum well light-emitting layers. Herein we map the synchrotron radiation microbeam X-ray fluorescence of In x Ga 1- x N blue LEDs at a sub-micron level. To acquire weak signals of In, Ar, which is in the air and has a fluorescent X-ray energy similar to that of In, is evacuated from the sample chamber by He purge. As a result, we successfully visualize the spatial In distribution of In x Ga 1- x N layer nondestructively and present good agreement with optical properties. Additionally, we demonstrate that unlike nanoscopic fluctuations, microscopic In compositional fluctuations do not necessarily have positive effects on device performance. Appropriately controlling both nanoscopic and microscopic fluctuations at the same time is necessary to achieve supreme device performance." @default.
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• W2919861387 date "2019-03-06" @default.
• W2919861387 modified "2023-10-14" @default.
• W2919861387 title "Impact of microscopic In fluctuations on the optical properties of InxGa1-xN blue light-emitting diodes assessed by low-energy X-ray fluorescence mapping using synchrotron radiation" @default.
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• W2919861387 doi "https://doi.org/10.1038/s41598-019-39086-5" @default.
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