Cargando…

Improved Optical Efficiency of 850-nm Infrared Light-Emitting Diode with Reflective Transparent Structure

This study investigated a reflective transparent structure to improve the optical efficiency of 850 nm infrared light-emitting diodes (IR-LEDs), by effectively enhancing the number of extracted photons emitted from the active region. The reflective transparent structure was fabricated by combining t...

Descripción completa

Detalles Bibliográficos
Autores principales: Lee, Hyung-Joo, Park, Jin-Young, Kwac, Lee-Ku, Lee, Jongsu
Formato: Online Artículo Texto
Lenguaje:English
Publicado: MDPI 2023
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC10456447/
https://www.ncbi.nlm.nih.gov/pubmed/37630122
http://dx.doi.org/10.3390/mi14081586
_version_ 1785096701376200704
author Lee, Hyung-Joo
Park, Jin-Young
Kwac, Lee-Ku
Lee, Jongsu
author_facet Lee, Hyung-Joo
Park, Jin-Young
Kwac, Lee-Ku
Lee, Jongsu
author_sort Lee, Hyung-Joo
collection PubMed
description This study investigated a reflective transparent structure to improve the optical efficiency of 850 nm infrared light-emitting diodes (IR-LEDs), by effectively enhancing the number of extracted photons emitted from the active region. The reflective transparent structure was fabricated by combining transparent epitaxial and reflective bonding structures. The transparent epitaxial structure was grown by the liquid-phase epitaxy method, which efficiently extracted photons emitted from the active area in IR-LEDs, both in the vertical and horizontal directions. Furthermore, a reflective bonding structure was fabricated using an omnidirectional reflector and a eutectic metal, which efficiently reflected the photons emitted downwards from the active area in an upward direction. To evaluate reflective transparent IR-LED efficiency, a conventional absorbing substrate infrared light-emitting diode (AS IR-LED) and a transparent substrate infrared light-emitting diode (TS IR-LED) were fabricated, and their characteristics were analyzed. Based on the power–current (L-I) evaluation results, the output power (212 mW) of the 850 nm IR-LED with the reflective transparent structure increased by 76% and 26%, relative to those of the AS IR-LED (121 mW) and TS IR-LED (169 mW), respectively. Furthermore, the reflective transparent structure possesses both transparent and reflective properties, as confirmed by photometric and radial theta measurements. Therefore, light photons emitted from the active area of the 850 nm IR-LED were efficiently extracted upward and sideways, because of the reflective transparent structure.
format Online
Article
Text
id pubmed-10456447
institution National Center for Biotechnology Information
language English
publishDate 2023
publisher MDPI
record_format MEDLINE/PubMed
spelling pubmed-104564472023-08-26 Improved Optical Efficiency of 850-nm Infrared Light-Emitting Diode with Reflective Transparent Structure Lee, Hyung-Joo Park, Jin-Young Kwac, Lee-Ku Lee, Jongsu Micromachines (Basel) Article This study investigated a reflective transparent structure to improve the optical efficiency of 850 nm infrared light-emitting diodes (IR-LEDs), by effectively enhancing the number of extracted photons emitted from the active region. The reflective transparent structure was fabricated by combining transparent epitaxial and reflective bonding structures. The transparent epitaxial structure was grown by the liquid-phase epitaxy method, which efficiently extracted photons emitted from the active area in IR-LEDs, both in the vertical and horizontal directions. Furthermore, a reflective bonding structure was fabricated using an omnidirectional reflector and a eutectic metal, which efficiently reflected the photons emitted downwards from the active area in an upward direction. To evaluate reflective transparent IR-LED efficiency, a conventional absorbing substrate infrared light-emitting diode (AS IR-LED) and a transparent substrate infrared light-emitting diode (TS IR-LED) were fabricated, and their characteristics were analyzed. Based on the power–current (L-I) evaluation results, the output power (212 mW) of the 850 nm IR-LED with the reflective transparent structure increased by 76% and 26%, relative to those of the AS IR-LED (121 mW) and TS IR-LED (169 mW), respectively. Furthermore, the reflective transparent structure possesses both transparent and reflective properties, as confirmed by photometric and radial theta measurements. Therefore, light photons emitted from the active area of the 850 nm IR-LED were efficiently extracted upward and sideways, because of the reflective transparent structure. MDPI 2023-08-12 /pmc/articles/PMC10456447/ /pubmed/37630122 http://dx.doi.org/10.3390/mi14081586 Text en © 2023 by the authors. https://creativecommons.org/licenses/by/4.0/Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (https://creativecommons.org/licenses/by/4.0/).
spellingShingle Article
Lee, Hyung-Joo
Park, Jin-Young
Kwac, Lee-Ku
Lee, Jongsu
Improved Optical Efficiency of 850-nm Infrared Light-Emitting Diode with Reflective Transparent Structure
title Improved Optical Efficiency of 850-nm Infrared Light-Emitting Diode with Reflective Transparent Structure
title_full Improved Optical Efficiency of 850-nm Infrared Light-Emitting Diode with Reflective Transparent Structure
title_fullStr Improved Optical Efficiency of 850-nm Infrared Light-Emitting Diode with Reflective Transparent Structure
title_full_unstemmed Improved Optical Efficiency of 850-nm Infrared Light-Emitting Diode with Reflective Transparent Structure
title_short Improved Optical Efficiency of 850-nm Infrared Light-Emitting Diode with Reflective Transparent Structure
title_sort improved optical efficiency of 850-nm infrared light-emitting diode with reflective transparent structure
topic Article
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC10456447/
https://www.ncbi.nlm.nih.gov/pubmed/37630122
http://dx.doi.org/10.3390/mi14081586
work_keys_str_mv AT leehyungjoo improvedopticalefficiencyof850nminfraredlightemittingdiodewithreflectivetransparentstructure
AT parkjinyoung improvedopticalefficiencyof850nminfraredlightemittingdiodewithreflectivetransparentstructure
AT kwacleeku improvedopticalefficiencyof850nminfraredlightemittingdiodewithreflectivetransparentstructure
AT leejongsu improvedopticalefficiencyof850nminfraredlightemittingdiodewithreflectivetransparentstructure