Roughening the white OLED substrate’s surface through sandblasting to improve the external quantum efficiency

Zhou, Junhong; Ai, Na; Wang, Lei; Zheng, Huaili; Luo, Cheng; Jiang, Zhen; Sheng, Yu; Cao, Yong; Wang, Jian

doi:10.1016/j.orgel.2011.01.018

Cited by 52 publications

(22 citation statements)

References 30 publications

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“…Organic semiconductor components have been developed and studied in recent years [2][3][4][5][6][7][8][9]. Organic light emitting diode (OLED) and organic photovoltaic (OPV) devices are made on glass substrates or metal substrates which have excellent moisture-blocking ability in commercial products.…”

Section: Introductionmentioning

confidence: 99%

Effects of Long-Term Static Bending Deformation on a Barrier Thin Film for Flexible Organic Optoelectronic Devices

Tran

Lin

et al. 2018

Coatings

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Abstract:The objective of this study is to investigate the effect of long-term static bending on the encapsulation properties of a commercial barrier thin film for flexible optoelectronic devices. Encapsulation properties of the barrier film are evaluated under long-term static bending at various radii of curvature. Experimental results reveal that no significantly detrimental effect on the water vapor transmission rate (WVTR) at 40 • C and 90% RH is found for compressive bending up to 1000 h and for tensile bending up to 100 h with a radius of curvature of 5 mm or larger. However, WVTR of the barrier thin film is significantly increased and cracks are found in the barrier film when subjected to tensile bending of a radius of 10 mm or 5 mm for 1000 h. The expected WVTR of the given barrier thin film is numerically computed using a three-dimensional (3D) finite element model. Numerical results indicate that, with the presence of cracks in the barrier thin film, the WVTR increases for an apparent increase in moisture entrances. The WVTR calculated by the 3D cracking model concurs with the experimental results.

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Section: Introductionmentioning

confidence: 99%

Effects of Long-Term Static Bending Deformation on a Barrier Thin Film for Flexible Organic Optoelectronic Devices

Tran

Lin

et al. 2018

Coatings

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“…[8][9][10][11][12][13][14][15][16][17][18][19] Internal out-coupling converts the waveguide mode to the substrate mode and the air mode. External out-coupling converts the substrate mode to the air mode.…”

Section: Introductionmentioning

confidence: 99%

Fabrication of Light Scattering Structure by Self-organization of a Polymer: Application to Light Out-coupling Enhancement in OLEDs

Kido

2014

J. Photopol. Sci. Technol.

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Light scattering structures for light out-coupling enhancement in organic light emitting devices (OLEDs) were fabricated by self-organization of poly [(9,9-. The F8BT film spin-coated from chloroform or THF solution showed smooth surface, while the film spin-coated from the mixture of chloroform/1,4-dioxane or THF/1,4-dioxane solution showed rough wavy surface. Fourier transformation of the waves in the rough F8BT films exhibited large components having the wavelength corresponding to near-infrared region. Orange-emitting OLEDs were fabricated on the rough F8BT films. Indium zinc oxide (IZO) and organic layers were deposited by either evaporation or spin-coating. The surface roughnesses of the evaporated organic layers were same as the surface roughness of the F8BT. On the other hand, the spin-coated organic layer reduced the roughness of the F8BT. Both in the evaporated and the spin-coated OLEDs, the external quantum efficiencies of OLEDs were increased by 1.2 times compared with those of the OLEDs without the F8BT, indicating that the F8BT served as light scattering structure to enhance light out coupling.

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“…via sandblasting) [10], by the use of nanoparticles as scattering medium [11] or through microstructures [12,13]. The extraction of waveguide modes is challenging, as one has to alter the OLED-stack itself, potentially causing changes of the internal optoelectronic device characteristics.…”

Section: Introductionmentioning

confidence: 99%

White organic light emitting diodes with enhanced internal and external outcoupling for ultra-efficient light extraction and Lambertian emission

Bocksrocker¹,

Preinfalk²,

Asche-Tauscher³

et al. 2012

Opt. Express

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White organic light emitting diodes (WOLEDs) suffer from poor outcoupling efficiencies. The use of Bragg-gratings to enhance the outcoupling efficiency is very promising for light extraction in OLEDs, but such periodic structures can lead to angular or spectral dependencies in the devices. Here we present a method which combines highly efficient outcoupling by a TiO 2 -Bragg-grating leading to a 104% efficiency enhancement and an additional high quality microlens diffusor at the substrate/air interface. With the addition of this diffusor, we achieved not only a uniform white emission, but also further increased the already improved device efficiency by another 94% leading to an overall enhancement factor of about 4.

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Roughening the white OLED substrate’s surface through sandblasting to improve the external quantum efficiency

Cited by 52 publications

References 30 publications

Effects of Long-Term Static Bending Deformation on a Barrier Thin Film for Flexible Organic Optoelectronic Devices

Effects of Long-Term Static Bending Deformation on a Barrier Thin Film for Flexible Organic Optoelectronic Devices

Fabrication of Light Scattering Structure by Self-organization of a Polymer: Application to Light Out-coupling Enhancement in OLEDs

White organic light emitting diodes with enhanced internal and external outcoupling for ultra-efficient light extraction and Lambertian emission

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