Engineered films for display technologies

MacDonald, William

doi:10.1039/b310846p

Cited by 396 publications

(241 citation statements)

References 20 publications

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“…3) which shows a rougher surface with discrete 20-30 nm features on the HS PET film compared to the plain PET that are most likely crystallites [27]. The surface T g for PEN was found to be 120°C -similar to bulk values reported previously [28].…”

Section: Substrate Propertiessupporting

confidence: 69%

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Mechanical properties of SiOx gas barrier coatings on polyester films

Howells¹,

Henry²,

Leterrier³

et al. 2008

Surface and Coatings Technology

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This paper reports the impressive mechanical properties of 1 μm thick carbon-containing SiO x gas barrier coatings, characterised using the uniaxial fragmentation test. Such coatings have been found to act as excellent barriers to water vapour permeation partly because they can be made so thick without stress induced cracking. The impressive mechanical properties are thought to be due in part to the high amount of carbon they contain, which gives them a more organic character, as well as the fact that they are deposited as a succession of thinner layers. The adhesion of the coatings to the polyester film is good in all cases, reflecting a high density of covalent bonding at the interface. Improvement of the mechanical properties of a SiO x /PET composite can be achieved by altering the substrate. By replacing the PET with a heat-stabilised (HS) PET film, a HS film with an acrylate layer or PEN, it is found that the coating displays improved mechanical properties and adhesive strength (as well as barrier). This is thought to be due to the superior surface thermal and mechanical properties of these substrates. Deposition temperatures are at least 80°C, which causes molecular motion at the surface of a plain PET film and creates defects in the SiO x coating as it grows, making it more brittle and permeable to gas flow.

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Section: Substrate Propertiessupporting

confidence: 69%

“…Finally, as expected, PEN exhibits a greater modulus and yield stress. The improved properties are mainly due to the presence of the naphthalene ring in the PEN structure [28].…”

Section: Substrate Propertiesmentioning

confidence: 99%

Mechanical properties of SiOx gas barrier coatings on polyester films

Howells¹,

Henry²,

Leterrier³

et al. 2008

Surface and Coatings Technology

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“…9 However, ITO electrode comes with its own set of problems such as chemical instability in a reduced ambient, poor transparency in the blue region, release of oxygen and indium into the organic layer, imperfect work function alignment with typical hole-transport layers, and easy deterioration of ITO targets. 5 In addition, the optimum properties of ITO film can only be obtained from fully crystallized film deposited at high temperature ͑ϳ300°C͒ or annealed in air or oxygen ambient.…”

mentioning

confidence: 99%

“…There has been increasing activity for flexible organic lightemitting diodes ͑OLEDs͒ over the past few years, and it has focused on developing indium tin oxide ͑ITO͒-coated polymer substrates, such as polyethylene terephthalate ͑PET͒, [1][2][3][4][5] polycarbonate ͑PC͒, 6,7 polyimide, 8 polyethersulfone ͑PES͒, 9 polyethylene naphthalate ͑PEN͒, 9 and polycyclic olefin ͑PCO͒. 9 However, ITO electrode comes with its own set of problems such as chemical instability in a reduced ambient, poor transparency in the blue region, release of oxygen and indium into the organic layer, imperfect work function alignment with typical hole-transport layers, and easy deterioration of ITO targets.…”

mentioning

confidence: 99%

High-Performance Flexible Organic Light-Emitting Diodes Using Amorphous Indium Zinc Oxide Anode

Kang

Jeong

Kim

et al. 2007

Electrochem. Solid-State Lett.

105

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We demonstrate a high-performance flexible organic light-emitting diode ͑OLED͒ employing amorphous indium zinc oxide ͑IZO͒ anode. The amorphous IZO on flexible polycarbonate ͑PC͒ substrate shows similar electrical conductivity and optical transmittance with commercial ͑ITO͒ glass, even though it was prepared at Ͻ50°C. Moreover, it exhibits little resistance change during 5000 bending cycles, demonstrating good mechanical robustness. A green phosphorescent OLED fabricated on amorphous IZO on flexible PC shows maximum external quantum efficiency of ext = 13.7% and power efficiency of p = 32.7 lm/W, which are higher than a device fabricated on a commercial ITO on glass ͑ ext = 12.4% and p = 30.1 lm/W͒ and ITO on flexible PC ͑ ext = 8.5% and p =14.1 lm/W͒. The mechanical robustness and low-temperature deposition of IZO combined with high OLED performance clearly manifest that the amorphous IZO is a promising anode material for flexible displays. There has been increasing activity for flexible organic lightemitting diodes ͑OLEDs͒ over the past few years, and it has focused on developing indium tin oxide ͑ITO͒-coated polymer substrates, such as polyethylene terephthalate ͑PET͒, 1-5 polycarbonate ͑PC͒,polyimide, 8 polyethersulfone ͑PES͒, 9 polyethylene naphthalate ͑PEN͒, 9 and polycyclic olefin ͑PCO͒. 9 However, ITO electrode comes with its own set of problems such as chemical instability in a reduced ambient, poor transparency in the blue region, release of oxygen and indium into the organic layer, imperfect work function alignment with typical hole-transport layers, and easy deterioration of ITO targets. 5 In addition, the optimum properties of ITO film can only be obtained from fully crystallized film deposited at high temperature ͑ϳ300°C͒ or annealed in air or oxygen ambient. 10 With the increasing interest in the development of flexible OLEDs, there is great need for a more mechanically robust and transparent electrode because the resistance of crystallized ITO films on flexible substrate increases with increasing mechanical stain. The increase in resistance is related to the number of cracks generated in the electrode, which depends on applied strain and film thickness. 1,3 For this reason, new transparent conducting materials have been explored to replace ITO for flexible OLED anodes. To achieve better performance of flexible OLEDs, Zn-based transparent conducting oxide ͑TCO͒ films, such as ZnSn 2 O 4 , ZnSnO 3 , Zn 2 In 2 O 5 , and Al͑Ga͒-doped ZnO, have been applied as the anode.11-16 Among various Zn-based transparent conducting oxides, the Zn-doped In 2 O 3 ͑IZO͒ films recently have been recognized as promising TCO materials for OLEDs due to its good conductivity, high transparency, excellent surface smoothness, high etching rate, and low deposition temperature. [13][14][15][16] In particular, it has been confirmed that electrical and optical properties of amorphous IZO ͑a-IZO͒ films can be optimized at Ͻ50°C without a postannealing process. Therefore it is considered that a-IZO anode films can be applied to...

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“…Plastic substrate has a several drawbacks; high coefficient of linear thermal expansion (CLTE) and thermal instability is much higher than that of glass, limiting manufacturing process, so that heating leads to considerable thermal stress [3][4][5][6] . The development of Polyimide (PI) opened many opportunities for the different industries.…”

Section: Introductionmentioning

confidence: 99%

Bendable TN-LCD Using Transparent Polyimide Substrate

Kim

Lee

2013

Trans. Mat. Res. Soc. Japan

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Transparent colorless polyimide (C. PI) substrate with good optical transparency and high glass transition temperature was developed. To explore performance and process-ability, IZO (indium zinc oxide) pixel electrode was deposited onto the C. PI and the quality of IZO thin films in terms of sheet resistance and transparency was measured. We next fabricated 3-inch C.PI-based liquid crystal display (LCD) clock by mean of sheet-to-sheet freestanding process and investigated its electro-optic characteristics. The resulting LCD showed good electro-optic characteristics; contrast ratio and response time of on/off operation were 826:1 and 12.0 ms, respectively.

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Engineered films for display technologies

Cited by 396 publications

References 20 publications

Mechanical properties of SiOx gas barrier coatings on polyester films

Mechanical properties of SiOx gas barrier coatings on polyester films

High-Performance Flexible Organic Light-Emitting Diodes Using Amorphous Indium Zinc Oxide Anode

Bendable TN-LCD Using Transparent Polyimide Substrate

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