Efficient Deep‐Blue Organic Light‐Emitting Diodes: Arylamine‐Substituted Oligofluorenes

Gao, Zhi Qiang; Li, Zhong Hui; Xia, Peng; Wong, Man Shing; Cheah, Kok Wai; Chen, Chin H.

doi:10.1002/adfm.200700238

Cited by 128 publications

(68 citation statements)

References 25 publications

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“…Materials: 1 [36], 9-phenyl-9-fluorenol [52], and 2,7-dibromo-9,9-diphenylfluorene [53] were prepared by reported procedures. The solvents were dried using standard procedures.…”

Section: Methodsmentioning

confidence: 99%

A Bipolar Host Material Containing Triphenylamine and Diphenylphosphoryl‐Substituted Fluorene Units for Highly Efficient Blue Electrophosphorescence

Hsu

Chien

Shu

et al. 2009

Adv Funct Materials

197

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Highly efficient blue electrophosphorescent organic light‐emitting diodes incorporating a bipolar host, 2,7‐bis(diphenylphosphoryl)‐9‐[4‐(N,N‐diphenylamino)phenyl]‐9‐phenylfluorene (POAPF), doped with a conventional blue triplet emitter, iridium(III) bis[(4,6‐difluoro‐phenyl)pyridinato‐N,C2´]picolinate (FIrpic) are fabricated. The molecular architecture of POAPF features an electron‐donating (p‐type) triphenylamine group and an electron‐accepting (n‐type) 2,7‐bis(diphenyl‐phosphoryl)fluorene segment linked through the sp3‐hybridized C9 position of the fluorene unit. The lack of conjugation between these p‐ and n‐type groups endows POAPF with a triplet energy gap (ET) of 2.75 eV, which is sufficiently high to confine the triplet excitons on the blue‐emitting guest. In addition, the built‐in bipolar functionality facilitates both electron and hole injection. As a result, a POAPF‐based device doped with 7 wt% FIrpic exhibits a very low turn‐on voltage (2.5 V) and high electroluminescence efficiencies (20.6% and 36.7 lm W−1). Even at the practical brightnesses of 100 and 1000 cd m−2, the efficiencies remain high (20.2%/33.8 lm W−1 and 18.8%/24.3 lm W−1, respectively), making POAPF a promising material for use in low‐power‐consumption devices for next‐generation flat‐panel displays and light sources.

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“…Materials: 1 [36], 9-phenyl-9-fluorenol [52], and 2,7-dibromo-9,9-diphenylfluorene [53] were prepared by reported procedures. The solvents were dried using standard procedures.…”

Section: Methodsmentioning

confidence: 99%

A Bipolar Host Material Containing Triphenylamine and Diphenylphosphoryl‐Substituted Fluorene Units for Highly Efficient Blue Electrophosphorescence

Hsu

Chien

Shu

et al. 2009

Adv Funct Materials

197

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“…The EL efficiency of this POAnbased device is one of the highest reported for a deep-blue EL device having CIE coordinates of (y, < 0.10). [2,9,36,37] From Figure 8, we note that the degrees of efficiency roll-off are almost identical for the multilayer and bilayer devices, even at a high current density of 100 mA cm À2 , indicating that the issue of exciton-polaron (electron carrier) annihilation in the simple bilayer device may not be important and is comparable to that in the multilayer device. [38] This result also suggests that the exciton formation zone is located adjacent to HTL, because of the good electron-transporting property of POAn.…”

Section: Electroluminescence Properties Of Oledsmentioning

confidence: 91%

Multifunctional Deep‐Blue Emitter Comprising an Anthracene Core and Terminal Triphenylphosphine Oxide Groups

Chien

Chen

Hsu

et al. 2009

Adv Funct Materials

240

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A highly efficient blue‐light emitter, 2‐tert‐butyl‐9,10‐bis[4′‐(diphenyl‐phosphoryl)phenyl]anthracene (POAn) is synthesized, and comprises electron‐deficient triphenylphosphine oxide side groups appended to the 9‐ and 10‐positions of a 2‐tert‐butylanthracene core. This sophisticated anthracene compound possesses a non‐coplanar configuration that results in a decreased tendency to crystallize and weaker intermolecular interactions in the solid state, leading to its pronounced morphological stability and high quantum efficiency. In addition to serving as an electron‐transporting blue‐light‐emitting material, POAn also facilitates electron injection from the Al cathode to itself. Consequently, simple double‐layer devices incorporating POAn as the emitting, electron‐transporting, and ‐injecting material produce bright deep‐blue lights having Commission Internationale de L'Eclairage coordinates of (0.15,0.07). The peak electroluminescence performance was 4.3% (2.9 cd A−1). For a device lacking an electron‐transport layer or alkali fluoride, this device displays the best performance of any such the deep‐blue organic light‐emitting diodes reported to date.

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“…Therefore, the development of a high-performance deep-blue emitter is one of the most important issues for OLEDs. [9][10][11][12] The deepblue color is defined by the Commission Internationale d Eclairage (CIE x y coordinates of y < 0 15, where use of the deep-blue color for full-color OLEDs not only reduces the power consumption and excitons in deep-blue-emitting layers, but also transfers energy easily to green-and redemitting layers. In this paper, we introduce an efficient deep-blue OLED that uses a novel deep-blue dopant based on a double-emitting layer (D-EML) system.…”

Section: Introductionmentioning

confidence: 99%

Efficient Deep-Blue Organic Light-Emitting Diodes Using Double-Emitting Layer

Seo¹,

Seo²,

Lee³

et al. 2012

j. nanosci. nanotech.

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Efficient deep-blue organic light-emitting diodes were demonstrated using 1,4-tetranaphthalene doped in double-emitting layers (D-EMLs) consisting of 2-methyl-9,10-di(2-naphthyl)anthracene and 4'-(dinaphthalen-2-yl)-1,1'-binaphthyl as blue hosts. The device with D-EML exhibits good confinement of holes and electrons, as well as a broad recombination zone. The optimized device showed a peak current efficiency of 3.67 cd/A, a peak external quantum efficiency of 3.97%, and Commission Internationale de L'Eclairage coordinates of (0.16, 0.10).

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Efficient Deep‐Blue Organic Light‐Emitting Diodes: Arylamine‐Substituted Oligofluorenes

Cited by 128 publications

References 25 publications

A Bipolar Host Material Containing Triphenylamine and Diphenylphosphoryl‐Substituted Fluorene Units for Highly Efficient Blue Electrophosphorescence

A Bipolar Host Material Containing Triphenylamine and Diphenylphosphoryl‐Substituted Fluorene Units for Highly Efficient Blue Electrophosphorescence

Multifunctional Deep‐Blue Emitter Comprising an Anthracene Core and Terminal Triphenylphosphine Oxide Groups

Efficient Deep-Blue Organic Light-Emitting Diodes Using Double-Emitting Layer

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