Silicon‐Cored Anthracene Derivatives as Host Materials for Highly Efficient Blue Organic Light‐Emitting Devices

Lyu, Yi‐Yeol; Kwak, Jeonghun; Kwon, Ohyun; Lee, Soo-Hyoung; Kim, Doyun; Lee, Changhee; Char, Kookheon

doi:10.1002/adma.200602885

Cited by 167 publications

(98 citation statements)

References 40 publications

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“…However, these organic fluorescent π-conjugated compounds pose small problems, such as poor thermal stability and device failure caused by intermolecular π-stacking features. Novel silicon-cored (triphenylsilane) [29,30] or asymmetric anthracene derivatives [31][32][33] containing bulky aryl substituents at the 9,10-position that exhibit high thermal stability and good EL properties as blue host materials have recently been investigated. Furthermore, 9,10-diarylanthracene (DAA) compounds containing aryl groups such as spirobifluorene [34] and carbazole [35,36] moieties are advantageous in terms of preventing close packing of the molecular structure, thereby achieving high quantum efficiency and EL properties.…”

Section: Introductionmentioning

confidence: 99%

Synthesis and Electroluminescence Properties of 3-(Trifluoromethyl)phenyl-Substituted 9,10-Diarylanthracene Derivatives for Blue Organic Light-Emitting Diodes

Kwak

Lee

et al. 2017

Applied Sciences

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Diaryl-substituted anthracene derivatives containing 3-(trifluoromethyl)phenyl) groups, 9,10-diphenyl-2-(3-(trifluoromethyl)phenyl)anthracene (1), 9,10-di([1,1 -biphenyl]-4-yl)-2-(3-(trifluoromethyl)phenyl)anthracene (2), and 9,10-di(naphthalen-2-yl)-2-(3-(trifluoromethyl)phenyl) anthracene (3) were synthesized and characterized. The compounds 1-3 possessed high thermal stability and proper frontier-energy levels, which make them suitable as host materials for blue organic light-emitting diodes. The electroluminescent (EL) emission maximum of the three N,N-diphenylamino phenyl vinyl biphenyl (DPAVBi)-doped (8 wt %) devices for compounds 1-3 was exhibited at 488 nm (for 1) and 512 nm (for 2 and 3). Among them, the 1-based device displayed the highest device performances in terms of brightness (L max = 2153.5 cd·m −2 ), current efficiency (2.1 cd·A −1 ), and external quantum efficiency (0.8%), compared to the 2-and 3-based devices.

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Section: Introductionmentioning

confidence: 99%

Synthesis and Electroluminescence Properties of 3-(Trifluoromethyl)phenyl-Substituted 9,10-Diarylanthracene Derivatives for Blue Organic Light-Emitting Diodes

Kwak

Lee

et al. 2017

Applied Sciences

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“…They usually have a shorter lifetime than the fluorescent OLEDs, however, and the lifetime of blue phosphorescent OLEDs is particularly low. Even though their efficiency is low, all the colors (from red to blue) of fluorescence-based OLEDs have been developed over the past decades in terms of stability, efficiency, and color purity [12][13][14], owing to their high stability. Moreover, white OLEDs (WOLEDs) composed of two or three fluorescent dye colors have advantages in achieving a high color-rendering index (CRI) and high stability for display or lighting applications.…”

Section: Introductionmentioning

confidence: 99%

Fluorescent white OLEDs with a high color‐rendering index using a silicon‐cored anthracene derivative as a blue host

Kwak

Lyu²,

Lee

et al. 2010

Journal of Information Display

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Fluorescent white organic light-emitting diodes showing high color-rendering indices (CRIs) of up to 81 was demonstrated, with a silicon-cored anthracene derivative (PATSPA) doped with DPAVBi utilized as the deep-blue host and dye materials, and the commercial dyes rubrene and DCM2 utilized as the orange-and red-light-emitting dyes. The devices, consisting of three emissive layers, showed bright-white-light emission, but the ratio of the blue peak to the orange and red peaks changed with the current density and the thickness of the blue emissive layer. A high CRI was achieved with the use of a deep-blue emitter doped in a novel host and by optimizing the blue-layer thickness. The device with a blue-layer thickness of 10 nm showed the Commission Internationale de l'Eclairage (CIE) color coordinate of (0.33, 0.35), a high CRI of 81, and a moderate external quantum efficiency of 2% at a current density of 2.5 mA/cm 2 .

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“…Typically hole-transporting fragments based on carbazole 13,36 or silane 37,38 derivatives have been considered although issues related to device efficiency or lowering of device operating voltage remain. For example, the most commonly used carbazole-based material, 4,4'-bis(N-carbazolyl)-1,1'-biphenyl (CBP) with high triplet energy gaps and excellent hole transporting properties, has been widely used as host material for green and red phosphorescent emitters.…”

Section: Degradation In Host Moleculesmentioning

confidence: 99%

Theoretical investigation of the degradation mechanisms in host and guest molecules used in OLED active layers

2014

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A feature of OLEDs that has to date received little attention is the prediction of the stability of the molecules involved in the electrical and optical processes. Here, we present computational results intended to aid in the development of stable systems. We identify degradation pathways and define new strategies to guide the synthesis of stable materials for OLED applications for both phosphorescent emitters and organic host materials. The chemical reactivity of these molecules in the active layers of the devices is further complicated by the fact that, during operation, they can be either oxidized or reduced (as they localize a hole or an electron) in addition to forming both singlet and triplet excitons.

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Silicon‐Cored Anthracene Derivatives as Host Materials for Highly Efficient Blue Organic Light‐Emitting Devices

Cited by 167 publications

References 40 publications

Synthesis and Electroluminescence Properties of 3-(Trifluoromethyl)phenyl-Substituted 9,10-Diarylanthracene Derivatives for Blue Organic Light-Emitting Diodes

Synthesis and Electroluminescence Properties of 3-(Trifluoromethyl)phenyl-Substituted 9,10-Diarylanthracene Derivatives for Blue Organic Light-Emitting Diodes

Fluorescent white OLEDs with a high color‐rendering index using a silicon‐cored anthracene derivative as a blue host

Theoretical investigation of the degradation mechanisms in host and guest molecules used in OLED active layers

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