Improving the contrast ratio of OLED displays: An analysis of various techniques

Singh, Ranbir; Unni, K. N. Narayanan; Solanki, Ankur; Deepak, .

doi:10.1016/j.optmat.2011.10.005

Cited by 136 publications

(91 citation statements)

References 61 publications

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“…8,9,10,11 Optical metamaterials capable of interacting with circularly polarized (CP) light, based on helical structures, are of considerable interest as CP light can be used e.g. in optical communications between spinLEDs, 12 in displays, 13 or in quantum-based optical computing. 14 So far efforts to obtain chiral nematics filled with NPs have either relied on adding hydrocarbon groupcapped NPs to a chiral nematic matrix or, alternatively, on functionalizing gold NPs with chiral groups and dispersing them in a nematic liquid crystal.…”

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confidence: 99%

Helically Twisted Chiral Arrays of Gold Nanoparticles Coated with a Cholesterol Mesogen

et al. 2015

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Gold nanoparticles have been prepared, surface-functionalized with a 1:1 molar mixture of a hexylthiol ligand and a chiral mesogenic ligand consisting of a cholesterylbenzoate attached via an undecylthiol spacer. Grazing incidence Xray diffraction showed that, upon annealing, a columnar liquid crystal (LC) structure develops, with the nanoparticles forming strings on a regular oblique 2d lattice. Synchrotron radiation circular dichroism is substantially enhanced upon the isotropic-LC transition. In the proposed structural model, layers of gold columns rotate by a small angle relative to their neighbors, the columns winding around a helical axis. The work demonstrates that it is possible to obtain chiral LC superstructures from nanoparticles coated with chiral mesogen without the addition of a separate liquid crystal or chiral dopants. The results provide direction in the development of plasmonic metamaterials interacting selectively with circularly polarized light.

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Helically Twisted Chiral Arrays of Gold Nanoparticles Coated with a Cholesterol Mesogen

et al. 2015

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“…One field where CP light sources should be extremely fundamental resides in organic light-emitting diodes (OLEDs) display technology [139] where polarized light is used and manipulated to prevent reflection of ambient light and achieve high contrast 3D images and true black. [140] Moreover a CP screen reduces the perceived distortion found at some angles when the display is viewed through a LP filter, like polarized sunglasses, allowing for enhanced outdoor viewing of laptops or smartphones.…”

Section: Applications To Organic Light Emission Diodes Technologymentioning

confidence: 99%

Materials and 3D Designs of Helix Nanostructures for Chirality at Optical Frequencies

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et al. 2017

Advanced Optical Materials

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The capability to fully control the chiro‐optical properties of metamaterials has drawn considerable attention due to developments in metamaterial fabrication techniques and a deeper understanding of the light–matter interaction, enabling a number of applications from integrated photonics to life sciences. From simple geometrical studies on single helix shaped metamaterials, both the design complexity and nanofabrication capability are steadily increasing allowing to extend their properties to the visible regime and beyond. In this work, helix‐shaped micro‐ and nanostructures are reviewed, which have the possibility to modulate their optical response in the linear regime at optical frequencies by spatial arrangement or by constitutive material. An overview of different theories describing the general optical operation of chiral media and a discussion on experimental results obtained by the state‐of‐the‐art helix structures realized by different fabrication techniques is provided. Finally, advanced designs for improved functionality envisaged to match practical applications or to enable new optical multifunctionalities are compared. Even if many applications have been envisaged only theoretically, the continuous effort and progress shown by the research community engaged in this field suggests that helical chiral metamaterials could represent a disruptive breakthrough for advanced optical devices.

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“…It was reported that 80% of the emitted light from OLED devices is confined in the substrate [6,7]. Various methods have been proposed to extract the emitted light, such as waveguide modes [8,9], micro lens arras [10] and utilization of surface plasmons [11,12]. The extraction of light from the OLED devices using surface plasmons is made by incorporated in the polymer emitting layer of the gold or silver nanoparticles.…”

Section: Introductionmentioning

confidence: 99%

Electroluminescence Enhancement of Polymer Light Emitting Diodes Through Surface Plasmons by Ag Nanoplates

et al. 2016

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This paper reports a study on the surface plasmon effect of Ag nanoplates on electroluminescent property of polymer light emitting diodes. The diode is a single layer light emitting device made of poly [9,9-di-(2-ethylhexyl)-fluorenyl-2,7-diyl] (PEHF). 5 wt.% of Ag nanoplates were incorporated into the PEHF layer. The results showed that the electroluminescence intensity of the diodes is increased by 51.85%, compared with the device without the Ag nanoplates. The enhancement is due to the coupling process between the Ag surface plasmon with the emission light from the PEHF. The occurrence of the coupling process was proved firstly based on the fact that the exciton lifetime of the PEHF:Ag layer is shorter than that without Ag, as measured by time-resolved photoluminescence spectroscopy. Secondly, the PEHF photoluminescence peak at 425 nm is overlaping with the surface plasmon absorption peak of Ag nanoplates.

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Improving the contrast ratio of OLED displays: An analysis of various techniques

Cited by 136 publications

References 61 publications

Helically Twisted Chiral Arrays of Gold Nanoparticles Coated with a Cholesterol Mesogen

Helically Twisted Chiral Arrays of Gold Nanoparticles Coated with a Cholesterol Mesogen

Materials and 3D Designs of Helix Nanostructures for Chirality at Optical Frequencies

Electroluminescence Enhancement of Polymer Light Emitting Diodes Through Surface Plasmons by Ag Nanoplates

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