Highly enhanced light extraction for organic light emitting diodes by self-assembly microlens-array films

Light extraction efficiency (LEE) and angular-spectrum stability of organic light emitting diode (OLED) are significantly improved by using self-assembly microlens-array films (MAFs) made of a monolayer based on silica microspheres and acrylic resin as light extractor. The close-packed light MAFs wi...

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Published inJournal of luminescence Vol. 263; p. 119986
Main Authors Lin, Bo-Yen, Lin, Ya-Xun, Lin, Shao-Ju, Lin, Yi-Yen, Chen, Su-Hua, Wei, Mao-Kuo
Format Journal Article
LanguageEnglish
Published Elsevier B.V 01.11.2023
Subjects
Light extraction
Microlens
Organic light-emitting diodes
Light extraction
Microlens
Organic light-emitting diodes
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Abstract Light extraction efficiency (LEE) and angular-spectrum stability of organic light emitting diode (OLED) are significantly improved by using self-assembly microlens-array films (MAFs) made of a monolayer based on silica microspheres and acrylic resin as light extractor. The close-packed light MAFs with a high fill factor of 71.42% was uniformly fabricated by a facile and low-cost solution process of spin-coating. The MAFs feature highly transmissive with transmittance of 86.2–90.6% and also high haze of 78.9–82.4% in UV–Vis regime. External quantum efficiency (EQE) of OLED with MAFs was significantly improved from 3.04 to 5.04%, corresponding to an enhancement of 66% compared with reference OLED. The small angular shift of CIE-indices is in a range of (0.008, 0.004), while viewing angle changes from 0° to 60°. Besides, the origin of high LEE and angular-spectrum stability was due to high scattering effect induced by high haze, leading to a Lambertian emissive profile. Notably, the proposed fabrication for the MAFs is simple and scalable, which was believed to be a promising approach for display and lighting applications. [Display omitted] •The silica based MAFs with high fill factor, transmittance and haze of ∼71.4%, 90% and 80% in at wavelength from 380 to 780 nm.•High light extraction in EQE enhancement of 66% and angular-spectrum stability was achieved for OLED.•The proposed fabrication for MAFs is facile and scalable.•The origin of high LEE and angular-spectrum stability was deduced from high scattering effect.
AbstractList Light extraction efficiency (LEE) and angular-spectrum stability of organic light emitting diode (OLED) are significantly improved by using self-assembly microlens-array films (MAFs) made of a monolayer based on silica microspheres and acrylic resin as light extractor. The close-packed light MAFs with a high fill factor of 71.42% was uniformly fabricated by a facile and low-cost solution process of spin-coating. The MAFs feature highly transmissive with transmittance of 86.2–90.6% and also high haze of 78.9–82.4% in UV–Vis regime. External quantum efficiency (EQE) of OLED with MAFs was significantly improved from 3.04 to 5.04%, corresponding to an enhancement of 66% compared with reference OLED. The small angular shift of CIE-indices is in a range of (0.008, 0.004), while viewing angle changes from 0° to 60°. Besides, the origin of high LEE and angular-spectrum stability was due to high scattering effect induced by high haze, leading to a Lambertian emissive profile. Notably, the proposed fabrication for the MAFs is simple and scalable, which was believed to be a promising approach for display and lighting applications. [Display omitted] •The silica based MAFs with high fill factor, transmittance and haze of ∼71.4%, 90% and 80% in at wavelength from 380 to 780 nm.•High light extraction in EQE enhancement of 66% and angular-spectrum stability was achieved for OLED.•The proposed fabrication for MAFs is facile and scalable.•The origin of high LEE and angular-spectrum stability was deduced from high scattering effect.
ArticleNumber 119986
Author Chen, Su-Hua
Lin, Shao-Ju
Lin, Ya-Xun
Wei, Mao-Kuo
Lin, Bo-Yen
Lin, Yi-Yen
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  email: mkwei@gms.ndhu.edu.tw
  organization: Department of Materials Science and Engineering, National Dong Hwa University, Hualien 974301, Taiwan
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crossref_primary_10_1016_j_rio_2023_100570
crossref_primary_10_1016_j_jlumin_2024_120776
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Snippet Light extraction efficiency (LEE) and angular-spectrum stability of organic light emitting diode (OLED) are significantly improved by using self-assembly...
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SubjectTerms Light extraction
Microlens
Organic light-emitting diodes
Title Highly enhanced light extraction for organic light emitting diodes by self-assembly microlens-array films
URI https://dx.doi.org/10.1016/j.jlumin.2023.119986
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