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A Review of Various Attempts on Multi-Functional Encapsulation Technologies for the Reliability of OLEDs

As the demand for flexible organic light-emitting diodes (OLEDs) grows beyond that for rigid OLEDs, various elements of OLEDs, such as thin-film transistors, electrodes, thin-film encapsulations (TFEs), and touch screen panels, have been developed to overcome OLEDs’ physical and chemical limitations...

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Autores principales: Jeon, Yongmin, Lee, Hyeongjun, Kim, Hyeunwoo, Kwon, Jeong-Hyun
Formato: Online Artículo Texto
Lenguaje:English
Publicado: MDPI 2022
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC9502182/
https://www.ncbi.nlm.nih.gov/pubmed/36144102
http://dx.doi.org/10.3390/mi13091478
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author Jeon, Yongmin
Lee, Hyeongjun
Kim, Hyeunwoo
Kwon, Jeong-Hyun
author_facet Jeon, Yongmin
Lee, Hyeongjun
Kim, Hyeunwoo
Kwon, Jeong-Hyun
author_sort Jeon, Yongmin
collection PubMed
description As the demand for flexible organic light-emitting diodes (OLEDs) grows beyond that for rigid OLEDs, various elements of OLEDs, such as thin-film transistors, electrodes, thin-film encapsulations (TFEs), and touch screen panels, have been developed to overcome OLEDs’ physical and chemical limitations through material and structural design. In particular, TFEs, which protect OLEDs from the external environment, including reactive gases, heat, sunlight, dust, and particles, have technical difficulties to be solved. This review covers various encapsulation technologies that have been developed with the advent of atomic layer deposition (ALD) technology for highly reliable OLEDs, in which solutions to existing technical difficulties in flexible encapsulations are proposed. However, as the conventional encapsulation technologies did not show technological differentiation because researchers have focused only on improving their barrier performance by increasing their thickness and the number of pairs, OLEDs are inevitably vulnerable to environmental degradation induced by ultraviolet (UV) light, heat, and barrier film corrosion. Therefore, research on multi-functional encapsulation technology customized for display applications has been conducted. Many research groups have created functional TFEs by applying nanolaminates, optical Bragg mirrors, and interfacial engineering between layers. As transparent, wearable, and stretchable OLEDs will be actively commercialized beyond flexible OLEDs in the future, customized encapsulation considering the characteristics of the display will be a key technology that guarantees the reliability of the display and accelerates the realization of advanced displays.
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spelling pubmed-95021822022-09-24 A Review of Various Attempts on Multi-Functional Encapsulation Technologies for the Reliability of OLEDs Jeon, Yongmin Lee, Hyeongjun Kim, Hyeunwoo Kwon, Jeong-Hyun Micromachines (Basel) Review As the demand for flexible organic light-emitting diodes (OLEDs) grows beyond that for rigid OLEDs, various elements of OLEDs, such as thin-film transistors, electrodes, thin-film encapsulations (TFEs), and touch screen panels, have been developed to overcome OLEDs’ physical and chemical limitations through material and structural design. In particular, TFEs, which protect OLEDs from the external environment, including reactive gases, heat, sunlight, dust, and particles, have technical difficulties to be solved. This review covers various encapsulation technologies that have been developed with the advent of atomic layer deposition (ALD) technology for highly reliable OLEDs, in which solutions to existing technical difficulties in flexible encapsulations are proposed. However, as the conventional encapsulation technologies did not show technological differentiation because researchers have focused only on improving their barrier performance by increasing their thickness and the number of pairs, OLEDs are inevitably vulnerable to environmental degradation induced by ultraviolet (UV) light, heat, and barrier film corrosion. Therefore, research on multi-functional encapsulation technology customized for display applications has been conducted. Many research groups have created functional TFEs by applying nanolaminates, optical Bragg mirrors, and interfacial engineering between layers. As transparent, wearable, and stretchable OLEDs will be actively commercialized beyond flexible OLEDs in the future, customized encapsulation considering the characteristics of the display will be a key technology that guarantees the reliability of the display and accelerates the realization of advanced displays. MDPI 2022-09-06 /pmc/articles/PMC9502182/ /pubmed/36144102 http://dx.doi.org/10.3390/mi13091478 Text en © 2022 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 Review
Jeon, Yongmin
Lee, Hyeongjun
Kim, Hyeunwoo
Kwon, Jeong-Hyun
A Review of Various Attempts on Multi-Functional Encapsulation Technologies for the Reliability of OLEDs
title A Review of Various Attempts on Multi-Functional Encapsulation Technologies for the Reliability of OLEDs
title_full A Review of Various Attempts on Multi-Functional Encapsulation Technologies for the Reliability of OLEDs
title_fullStr A Review of Various Attempts on Multi-Functional Encapsulation Technologies for the Reliability of OLEDs
title_full_unstemmed A Review of Various Attempts on Multi-Functional Encapsulation Technologies for the Reliability of OLEDs
title_short A Review of Various Attempts on Multi-Functional Encapsulation Technologies for the Reliability of OLEDs
title_sort review of various attempts on multi-functional encapsulation technologies for the reliability of oleds
topic Review
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC9502182/
https://www.ncbi.nlm.nih.gov/pubmed/36144102
http://dx.doi.org/10.3390/mi13091478
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