Novel star-shaped host materials for highly efficient solution-processed phosphorescent organic light-emitting diodes

Jiang, Wei; Duan, Lian; Qiao, Juan; Zhang, Deqiang; Dong, Guifang; Wang, Liduo; Qiu, Yong

doi:10.1039/c0jm00692k

Cited by 75 publications

(50 citation statements)

References 31 publications

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“…[32][33][34][35] The small-molecule mCP [1,3-bis(9-carbazolyl)benzene] which has a triplet energy of 2.9 eV is widely used in this context. [36][37][38][39][40][41] However, mCP tends to crystallize as a consequence of its rather low T g (glass transition temperature, 60 °C). It is a challenge to develop a polymeric host that has a higher T g than mCP while maintaining mCP's desirable optoelectronic properties.…”

Section: Introductionmentioning

confidence: 99%

Solution-Processed Blue/Deep Blue and White Phosphorescent Organic Light-Emitting Diodes (PhOLEDs) Hosted by a Polysiloxane Derivative with Pendant mCP (1,3-bis(9-carbazolyl)benzene)

Sun¹,

Zhou

Liu³

et al. 2015

ACS Appl. Mater. Interfaces

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Shouke (2015) 'Solution-processed blue/deep blue and white phosphorescent organic light emitting diodes (PhOLEDs) hosted by a polysiloxane derivative with pendant mCP (1, 3-bis(9-carbazolyl)benzene).', ACS applied materials interfaces., 7 (51). pp. 27989-27998. Further information on publisher's website:http://dx.doi.org/10.1021/am507592sPublisher's copyright statement:This document is the Accepted Manuscript version of a Published Work that appeared in nal form in ACS Applied Materials and Interfaces, copyright c 2015 American Chemical Society after peer review and technical editing by the publisher. To access the nal edited and published work see http://dx.doi.org/10.1021/am507592s. Additional information:Use policyThe full-text may be used and/or reproduced, and given to third parties in any format or medium, without prior permission or charge, for personal research or study, educational, or not-for-pro t purposes provided that:• a full bibliographic reference is made to the original source • a link is made to the metadata record in DRO • the full-text is not changed in any way The full-text must not be sold in any format or medium without the formal permission of the copyright holders.Please consult the full DRO policy for further details.

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Section: Introductionmentioning

confidence: 99%

Solution-Processed Blue/Deep Blue and White Phosphorescent Organic Light-Emitting Diodes (PhOLEDs) Hosted by a Polysiloxane Derivative with Pendant mCP (1,3-bis(9-carbazolyl)benzene)

Sun¹,

Zhou

Liu³

et al. 2015

ACS Appl. Mater. Interfaces

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“…However, most of these solution processable materials for PHOLED are based on the polymer materials, which have an inherent number of problems, including lower carrier mobility of host materials, shorter lifetime of EL devices, especially their difficult syntheses and purifications [78,79]. Recently, soluble small molecule-based PHOLEDs have been reported [78][79][80][81][82][83][84][85], which can be overcoming above problems of polymer hosts.…”

Section: Wet Processable Host Materials For Phosphorescent Oledmentioning

confidence: 98%

“…Recently, soluble small molecule-based PHOLEDs have been reported [78][79][80][81][82][83][84][85], which can be overcoming above problems of polymer hosts. On the other hand, because of their high triplet energy gap and bipolar nature of carrier transport, carbazole units frequently have been used in phosphorescence host materials.…”

Section: Wet Processable Host Materials For Phosphorescent Oledmentioning

confidence: 99%

“…In order to advance thermal stability of host materials, the m-terphenyl group attached to the CCP molecule. Since possessing of high E T and high carrier mobility, m-terphenyl group has been successfully applied to phosphorescent host designing [78,90,91]. However, combining with m-terphenyl group generally molecules become very rigid and difficult to dissolve in common organic solvents.…”

Section: Wet Processable Host Materials For Phosphorescent Oledmentioning

confidence: 99%

“…In addition, host materials and device fabrication process has been caught attentions. Because of their high quantum efficiency and low-cost processing, considerable research has been made on solution processable materials for PHOLED during the last decade [70][71][72][73][74][75][76][77][78].…”

Section: Wet Processable Host Materials For Phosphorescent Oledmentioning

confidence: 99%

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Materials for Organic Light Emitting Diode (OLED)

Karatsu

2014

Electronic Processes in Organic Electronics

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Iridium complexes have a wide range of applications such as photocatalysts to reduce carbon dioxide [1], imaging reagents for living cells [2], and oxygen sensors [3]. In particular, organic light emitting diodes (OLED) is one of important industrial application for iridium complexes, due to their high phosphorescent efficiency at ambient temperature [4,5]. OLEDs have many advantages, including self-emission (no backlight required), an almost 180 wide view angle, light weight, thin (<2 mm), quick response (1,000 times faster than LCD), high contrast, and can be fabricated on flexible plastic substrates.In 1987, Tan et al. reported the potential of OLEDs using tris (8-hydroxyquinolinato) aluminium (III) (Alq 3 ) [6]. Before them, the OLED device has simple configuration that has single organic crystal sandwiched by two electrodes. They introduced concept of OLED device configuration composed of multiple thin layers (Fig. 11.1). Here, each layer has an exact function, such as charge transporting and emitting abilities. The external efficiency of this OLED device was 1 %, which meant an internal efficiency of 5 %, because the output efficiency from the device was approximately 20 % [7]. After charge (hole and electron) injection into the emitting layer, 25 % singlet and 75 % triplet excitons are generated by charge recombination. Therefore, the only usable amount of fluorescence is 25 %. If phosphorescent materials can be used, then the 75 % triplet excitons are usable. In addition, the triplet excited state has lower energy than the singlet excited state; therefore, there is a chance that intersystem crossing of singlet excited state to the triplet excited state could occur.

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Triplet Exciton Confinement in Green Organic Light‐Emitting Diodes Containing Luminescent Charge‐Transfer Cu(I) Complexes

Zhang¹,

Komino²,

Huang³

et al. 2012

Adv Funct Materials

296

217

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The temperature dependence of luminescence from [Cu(dnbp)(DPEPhos)]BF4 (dnbp = 2,9‐di‐n‐butylphenanthroline, DPEPhos = bis[2‐(diphenylphosphino)phenyl]ether) in a poly(methyl methacrylate) (PMMA) film indicates the presence of long‐life green emission arising from two thermally equilibrated charge transfer (CT) excited states and one non‐equilibrated triplet ligand center (3LC) excited state. At room temperature, the lower triplet CT state is found to be the predominantly populated excited state, and the zero‐zero energy of this state is found to be 2.72 eV from the onset of its emission at 80 K. The tunable emission maximum of [Cu(dnbp)(DPEPhos)]BF4 in various hosts with different triplet energies is explained in terms of the multiple triplet energy levels of this complex in amorphous films. Using the high triplet energy charge transport material as a host and an exciton‐blocking layer (EBL), a [Cu(dnbp)(DPEPhos)]BF4 based organic light‐emitting diode (OLED) achieves a high external quantum efficiency (EQE) of 15.0%, which is comparable to values for similar devices based on Ir(ppy)3 and FIrpic. The photoluminescence (PL) and electroluminescence (EL) performance of green emissive [Cu(μI)dppb]2 (dppb = 1,2‐bis[diphenylphosphino]benzene) in organic semiconductor films confirmed its 3CT state with a zero‐zero energy of 2.76 eV as the predominant population excited state.

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Novel star-shaped host materials for highly efficient solution-processed phosphorescent organic light-emitting diodes

Cited by 75 publications

References 31 publications

Solution-Processed Blue/Deep Blue and White Phosphorescent Organic Light-Emitting Diodes (PhOLEDs) Hosted by a Polysiloxane Derivative with Pendant mCP (1,3-bis(9-carbazolyl)benzene)

Solution-Processed Blue/Deep Blue and White Phosphorescent Organic Light-Emitting Diodes (PhOLEDs) Hosted by a Polysiloxane Derivative with Pendant mCP (1,3-bis(9-carbazolyl)benzene)

Materials for Organic Light Emitting Diode (OLED)

Triplet Exciton Confinement in Green Organic Light‐Emitting Diodes Containing Luminescent Charge‐Transfer Cu(I) Complexes

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