Light Scattering in Nanoparticle Doped Transparent Polyimide Substrates

Shen, Jiulin; Fu, Li; Cao, Zhonghuan; Barat, David; Tu, Guoli

doi:10.1021/acsami.7b03070

Cited by 34 publications

(33 citation statements)

References 41 publications

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“…With the rapid development of optoelectronic engineering, especially smart wearable devices, optical films with high thermal stability and transmittance as a flexible substrate are highly demanded. Traditional materials such as ultrathin glass or metal foils present an obvious weakness of brittleness or opacity in practical applications . Plastic films such as poly(ethylene terephthalate), polycarbonate, poly(ethylene‐2,6‐naphthalate) and polyester sulfone are expected to be alternative substrates owing to their excellent optical transmittance and flexibility.…”

Section: Introductionmentioning

confidence: 99%

Synthesis of highly transparent and heat‐resistant polyimides containing bulky pendant moieties

Zheng

et al. 2019

Polymer International

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A new diamine with bulky pendant biphenyl and ortho-position dimethyl structures, 4,4 ′ -((1,1 ′ -biphenyl)-4-ylmethylene)bis(2,6dimethylaniline), was synthesized via a one-pot reaction of 4-biphenyl carboxaldehyde and 2,6-dimethylaniline. The diamine was employed to polymerize with several dianhydrides via one-step condensation under high-temperature conditions. The light yellow or colorless polyimide (PI) films obtained were found to have cut-off wavelengths in the range 286-358 nm and transmittance over 80% in the visible region (400-780 nm). Meanwhile, these PIs possessed excellent solubility in common organic solvents, even in low-boiling-point solvents such as chloroform (CHCl 3 ), dichloromethane (CH 2 Cl 2 ) and tetrahydrofuran. The glass transition temperatures (T g ) of the PIs were determined to exceed 343 ∘ C, even to 456 ∘ C. All PI films were flexible with a tensile strength of 78-119 MPa, a Young's modulus of 2.0-2.5 GPa and elongation at break of 4.0%-8.2%. Therefore, these colorless PIs can be used as candidate materials for flexible display substrates.

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Section: Introductionmentioning

confidence: 99%

Synthesis of highly transparent and heat‐resistant polyimides containing bulky pendant moieties

Zheng

et al. 2019

Polymer International

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“…It is therefore not surprising that the work focused on the improvements of the light extraction by eliminating the SPPs mode, substrate mode, and WG mode in organic layers. Integrating the internal or external micro/nanostructures has demonstrated an effective approach to improve the light extraction efficiency of FOLEDs . In case of the internal micro/nanostructures, they are fabricated on a substrate or holes injection layer for an instance of PEDOT:PSS, and then replicate to atop organic materials and electrode layer by layer.…”

Section: Efficiency Improvement Of Flexible Organic Light‐emitting Dementioning

confidence: 99%

“…While in case of external micro/nanostructures with different feature size and geometries, microlens array, conical pillars, micrometric, pyramids, etc., have already been developed in the direction of light emission and demonstrated the ability of improving the light extraction theoretically and experimentally . Recently, the flexible plastic substrates combined with light scattering particles have started to show their potential on enhancing light extraction of FOLEDs for lighting panel application . In the practical application for lighting panel, the substrate with high haze and acceptable transmittance is favorable.…”

Section: Efficiency Improvement Of Flexible Organic Light‐emitting Dementioning

confidence: 99%

Recent Developments in Flexible Organic Light‐Emitting Devices

Liu

Feng

et al. 2018

Adv Materials Technologies

117

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wearable displays, and conceptual lighting panels. In addition, besides the excellent designs, a flexible OLED (FOLED) [7, has several other advantages, the displays and lighting panels are thinner, lighter, more cost effective, shatterproof, and durable compared to glass or silicon based OLEDs. They are impact resistance and less prone to break than glass. At present, both flexible displays and lighting panels are being mass produced (Samsung and LG on displays, LG and Konica Minolta on lighting). FOLEDs are becoming most promising and popular next-generation display technology in consumer electronics and lighting panels.In order to develop the FOLEDs and realize their practical application, many great efforts have been conducted. The key components of the FOLEDs are flexible substrate, bottom and top electrode, organic functional layers, encapsulation layer, and optional light extraction layers. Differed from conventional OLEDs on rigid glass or silicon substrate, FOLEDs are fabricated on flexible substrates. Up to now, metal foil, flexible glass, and plastic film have been commonly used as flexible substrates for FOLEDs. On the other hand, actual fabric materials, natural silk fibroin films, bacterial cellulose, and rubbery poly (urethane acrylate) have also been developed to achieve the requirements of wearable and stretchable displays. The electrode is also very important for FOLEDs. Compared with the top electrode, more research has been conducted on the bottom electrode because its surface roughness, conductivity, and transmittance for bottom emitting OLEDs play a key role in the performance of FOLEDs. As conventional indiumtin-oxide (ITO) is not suitable for flexible devices as it is brittle, many great alternatives such as thin metal film, conducting polymer, dielectric-metal-dielectric (DMD) multilayers, metal nanowires, graphene, carbon nanotubes (CNTs), and their compound have been studied. It should be mentioned that the performance of organic layers has almost no difference with rigid OLEDs because of their inherent excellent ductility and identical working mechanism. Moreover, for practical and commercial applications, stability and efficiency are two factors of crucial importance. As a consequence, the encapsulation technique and light extraction of FOLEDs are also two research hotspots in recent years. This review will summarize the key components, discuss the method of implementation, highlight the recent research progresses, and conclude the challenges and prospects of FOLEDs. demand for display technology in consumer electronics and lighting panels increases, thin, light, high-quality, and more cost-effective light-emitting devices are required. Organic light-emitting devices (OLEDs), satisfying the criteria exactly, have been considered the most promising next-generation display and lighting technique. In particular, an OLED based on flexible substrate enables the device to be applied to curved displays, electronic newspapers, wearable displays, and conceptual lighting panels, has been alwa...

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“…Moon et al [19] had a transmittance of 60%at 400 nm. Shen et al [20] added nano-silica particles in the F-containing system.…”

Section: Introductionmentioning

confidence: 99%

Synthesis and properties of fluorinated copolymerized polyimide films

Cao

Liu

et al. 2020

Polímeros

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Two series of fluorinated copolymerized polyimide films with different dianhydride ratios were prepared via the conventional two-step method by using 4,4-oxydianiline(ODA) as the diamine monomer, 4,4'-(hexafluoroisopropylidene) diphthalic anhydride(6FDA), 4,4'-oxydiphthalic anhydride(ODPA) and 3,3',4,4'-biphenyl tetracarboxylic dianhydride(BPDA) as the dianhydride monomer in N, N-dimethylacetamide. With the increase of 6FDA in the proportion of dianhydride, the tensile strength of the polyimide film showed a decreasing trend. This work provided a high performance film. The mass retention rate at 800°C was above 50%. The glass transition temperatures of the two films were 260 °C and 275 °C. The storage modulus of the two were 1500 MPa and 1250 MPa. The loss modulus were 218.70 MPa and 120.74 MPa. The transmittance of the film was 71.43%. The transmittance of fluorinated copolymerized polyimide films were significantly improved in the visible region of ultraviolet light, indicating that the polyimide film with high transmittance, high tensile strength, high heat resistance and high storage modulus was successfully prepared. It had an excellent application prospect in the field of flexible display.

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Light Scattering in Nanoparticle Doped Transparent Polyimide Substrates

Cited by 34 publications

References 41 publications

Synthesis of highly transparent and heat‐resistant polyimides containing bulky pendant moieties

Synthesis of highly transparent and heat‐resistant polyimides containing bulky pendant moieties

Recent Developments in Flexible Organic Light‐Emitting Devices

Synthesis and properties of fluorinated copolymerized polyimide films

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