Characterization of white-emitting copolymers for PLED displays

Buchhauser, D.; Scheffel, M.; Rogler, W.; Tschamber, Carsten; Heuser, Karsten; Hunze, Arvid; Gieres, Guenter; Henseler, Debora; Jakowetz, W.; Diekmann, Karsten; Winnacker, A.; Becker, Heinrich; Buesing, Arne; Falcou, A.; Rau, Lothar; Voegele, Sven; Goettling, Silke

doi:10.1117/12.563816

Cited by 11 publications

(7 citation statements)

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“…Side‐chain polymers usually consist of a homopolymer backbone to which different lumiphores and possibly also additional charge‐transporting moieties are attached through a passive spacer 30, 31. In main‐chain polymers, the different components are not only connected through covalent bonds, but in addition the π ‐conjugation can be maintained between adjacent components, thus allowing free charge transport along the polymer backbone 32–36. As a result of this, the excitation of the lumiphores in main‐chain polymers is often more efficient compared to the situation in material mixtures and side‐chain polymers.…”

Section: Approaches To White Light Generationmentioning

confidence: 99%

White Organic Light‐Emitting Diodes

2010

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White organic light-emitting diodes (WOLEDs) offer a range of attractive characteristics and are in several regards conceptually different from most currently used light sources. From an application perspective, their advantages include a high power efficiency that rivals the performance of fluorescent lamps and inorganic LEDs and the potential for a very low cost of manufacturing. As flat-panel light sources they are intrinsically glare-free and generate light over a large area. WOLEDs are constantly improving in terms of performance, durability, and manufacturability, but these improvements require joint research efforts in chemistry and the materials sciences to design better materials as well as in physics and engineering to invent new device concepts and design suitable fabrication schemes, a process that has generated many exciting scientific questions and answers. This article reviews current developments in the field of WOLEDs and puts a special focus on new device concepts and on approaches to reliable and cost-efficient WOLED manufacturing.

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Section: Approaches To White Light Generationmentioning

confidence: 99%

White Organic Light‐Emitting Diodes

2010

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“…In order to disentangle the various processes we investigate a set of three polymers (Merck KGaA) that contain an incremental number of dyes incorporated in the blue backbone: the blue backbone polymer (B), the backbone polymer with a green dye (BG), and the white‐emitting polymer with both a green and red dye (BGR) 36, 37. The structure of the white‐emitting copolymer BGR is shown in Figure .…”

Section: Introductionmentioning

confidence: 99%

Device Physics of White Polymer Light‐Emitting Diodes

Nicolai

Hof

Blom

2012

Adv Funct Materials

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The charge transport and recombination in white‐emitting polymer light‐ emitting diodes (PLEDs) are studied. The PLED investigated has a single emissive layer consisting of a copolymer in which a green and red dye are incorporated in a blue backbone. From single‐carrier devices the effect of the green‐ and red‐emitting dyes on the hole and electron transport is determined. The red dye acts as a deep electron trap thereby strongly reducing the electron transport. By incorporating trap‐assisted recombination for the red emission and bimolecular Langevin recombination for the blue emission, the current and light output of the white PLED can be consistently described. The color shift of single‐layer white‐emitting PLEDs can be explained by the different voltage dependencies of trap‐assisted and bimolecular recombination.

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“…One way to avoid this problem is to copolymerize the different components into a statistic copolymer. [11,[15][16][17] In this work we followed a similar approach by using a white-emitting statistical copolymer (PW) consisting mainly of a wide band-gap poly-spirofluorene backbone (BB, 79 mol%) that has an electron mobility of 10 -3 cm 2 /Vs. [18] The other components are a hole-transporting unit (HT, 10 mol%), a blue-emitting chromophore (BC, 11 mol%), and small quantities of red-(RC, 0.04 mol%) and green-(GC, 0.05 mol%) emitting chromophores.…”

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confidence: 99%

On the Origin of the Color Shift in White‐Emitting OLEDs

et al. 2007

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White‐emitting organic light‐emitting diodes (OLEDs) notoriously suffer from brightness‐dependent color shifts. Based on experimental data and fundamental considerations about charge‐transport and trapping, a quantitative model is developed which gives insight into the origin of this shift and describes the experimental data extremely well. Having understood the major contribution to the spectral instability, a device architecture is designed that shows excellent color stability over a wide range of brightness levels.

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Characterization of white-emitting copolymers for PLED displays

Cited by 11 publications

References 0 publications

White Organic Light‐Emitting Diodes

White Organic Light‐Emitting Diodes

Device Physics of White Polymer Light‐Emitting Diodes

On the Origin of the Color Shift in White‐Emitting OLEDs

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