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Simple Approach to Mitigate the Emission Wavelength Instability of III-Nitride μLED Arrays

[Image: see text] III-nitride semiconductors and their heterojunctions exhibit intrinsic polarization due to the asymmetry of their wurtzite structure, which determines all the fundamental properties of III-nitride optoelectronics. The intrinsic polarization-induced quantum-confined Stark effect lea...

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Autores principales: Martinez de Arriba, Guillem, Feng, Peng, Xu, Ce, Zhu, Chenqi, Bai, Jie, Wang, Tao
Formato: Online Artículo Texto
Lenguaje:English
Publicado: American Chemical Society 2022
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC9204810/
https://www.ncbi.nlm.nih.gov/pubmed/35726243
http://dx.doi.org/10.1021/acsphotonics.2c00221
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author Martinez de Arriba, Guillem
Feng, Peng
Xu, Ce
Zhu, Chenqi
Bai, Jie
Wang, Tao
author_facet Martinez de Arriba, Guillem
Feng, Peng
Xu, Ce
Zhu, Chenqi
Bai, Jie
Wang, Tao
author_sort Martinez de Arriba, Guillem
collection PubMed
description [Image: see text] III-nitride semiconductors and their heterojunctions exhibit intrinsic polarization due to the asymmetry of their wurtzite structure, which determines all the fundamental properties of III-nitride optoelectronics. The intrinsic polarization-induced quantum-confined Stark effect leads to an emission wavelength shift with increasing injection current for III-nitride visible LEDs, forming an insurmountable barrier for the fabrication of a full color display. For instance, a yellow LED designed to produce yellow light emits green or blue light at an elevated current, while a green (blue) LED gives off blue (violet) light with increasing current. This color instability becomes a serious issue for a microdisplay such as the displays for augmented reality (AR)/virtual reality (VR) typically utilized at proximity to the eye, where human eyes are sensitive to a tiny change in light color. It is well-known that an optical mode wavelength for a microcavity is insensitive to injection current. In this work, we have demonstrated an approach to epitaxially integrating microLEDs (green microLEDs as an example, one of the key components for a full color microdisplay) and a microcavity. This allows the emission from the microLEDs to be coupled with the microcavity, leading to a negligible emission wavelength shift with increasing injection current. In contrast, identical microLEDs but without a microcavity show a large emission wavelength shift from 560 nm down to 510 nm, measured under identical conditions. This approach provides a simple solution to resolving the 30-year issue in the field of III-nitride optoelectronics.
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spelling pubmed-92048102022-06-18 Simple Approach to Mitigate the Emission Wavelength Instability of III-Nitride μLED Arrays Martinez de Arriba, Guillem Feng, Peng Xu, Ce Zhu, Chenqi Bai, Jie Wang, Tao ACS Photonics [Image: see text] III-nitride semiconductors and their heterojunctions exhibit intrinsic polarization due to the asymmetry of their wurtzite structure, which determines all the fundamental properties of III-nitride optoelectronics. The intrinsic polarization-induced quantum-confined Stark effect leads to an emission wavelength shift with increasing injection current for III-nitride visible LEDs, forming an insurmountable barrier for the fabrication of a full color display. For instance, a yellow LED designed to produce yellow light emits green or blue light at an elevated current, while a green (blue) LED gives off blue (violet) light with increasing current. This color instability becomes a serious issue for a microdisplay such as the displays for augmented reality (AR)/virtual reality (VR) typically utilized at proximity to the eye, where human eyes are sensitive to a tiny change in light color. It is well-known that an optical mode wavelength for a microcavity is insensitive to injection current. In this work, we have demonstrated an approach to epitaxially integrating microLEDs (green microLEDs as an example, one of the key components for a full color microdisplay) and a microcavity. This allows the emission from the microLEDs to be coupled with the microcavity, leading to a negligible emission wavelength shift with increasing injection current. In contrast, identical microLEDs but without a microcavity show a large emission wavelength shift from 560 nm down to 510 nm, measured under identical conditions. This approach provides a simple solution to resolving the 30-year issue in the field of III-nitride optoelectronics. American Chemical Society 2022-05-27 2022-06-15 /pmc/articles/PMC9204810/ /pubmed/35726243 http://dx.doi.org/10.1021/acsphotonics.2c00221 Text en © 2022 The Authors. Published by American Chemical Society https://creativecommons.org/licenses/by/4.0/Permits the broadest form of re-use including for commercial purposes, provided that author attribution and integrity are maintained (https://creativecommons.org/licenses/by/4.0/).
spellingShingle Martinez de Arriba, Guillem
Feng, Peng
Xu, Ce
Zhu, Chenqi
Bai, Jie
Wang, Tao
Simple Approach to Mitigate the Emission Wavelength Instability of III-Nitride μLED Arrays
title Simple Approach to Mitigate the Emission Wavelength Instability of III-Nitride μLED Arrays
title_full Simple Approach to Mitigate the Emission Wavelength Instability of III-Nitride μLED Arrays
title_fullStr Simple Approach to Mitigate the Emission Wavelength Instability of III-Nitride μLED Arrays
title_full_unstemmed Simple Approach to Mitigate the Emission Wavelength Instability of III-Nitride μLED Arrays
title_short Simple Approach to Mitigate the Emission Wavelength Instability of III-Nitride μLED Arrays
title_sort simple approach to mitigate the emission wavelength instability of iii-nitride μled arrays
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC9204810/
https://www.ncbi.nlm.nih.gov/pubmed/35726243
http://dx.doi.org/10.1021/acsphotonics.2c00221
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