Highly efficient blue and all-phosphorescent white polymer light-emitting devices based on polyfluorene host

Wu, Hongbin; Li, Yanhu; Wu, Hao; Lam, Ching Shan; Chen, Zhao; Wong, Wai Yeung; Cao, Yong

doi:10.1016/j.orgel.2013.04.028

Cited by 20 publications

(3 citation statements)

References 29 publications

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“…Thermally evaporated CsF as an efficient EIL has been successfully demonstrated in OLEDs. , It is suggested that CsF adjusts the cathode’s work function by doping the organic function layer with Cs ions, and the deposition of aluminum can form AlF 3 , thereby releasing metallic Cs and creating an ohmic contact for electron injection . The fluoride-based EIL also protects the organic active layer from metal deposition and stabilizes the interface .…”

Section: Discussionmentioning

confidence: 99%

Highly Efficient, Solution Processed Electrofluorescent Small Molecule White Organic Light-Emitting Diodes with a Hybrid Electron Injection Layer

Jiang

Zhong

Xue

et al. 2014

ACS Appl. Mater. Interfaces

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Highly efficient, solution-processed, and all fluorescent white organic light-emitting diodes (WOLEDs) based on fluorescent small molecules have been achieved by incorporating a low-conductivity hole injection layer and an inorganic-organic hybrid electron injection layer. The light-emission layer is created by doping a fluorescent π-conjugated blue dendrimer host (the zeroth generation dendrimer, G0) with a yellow-emitting fluorescent dopant oligo(paraphenylenevinylene) derivative CN-DPASDB with a doping ratio of 100:0.15 (G0:CN-DPASDB) by weight. To suppress excessive holes, the high-conductivity hole injection layer (PEDOT:PSS AI 4083) is replaced by the low-conductivity PEDOT:PSS CH 8000. To facilitate the electron injection, a hybrid electron injection layer is introduced by doping a methanol/water-soluble conjugated polymer poly[(9,9-bis(30-(N,N-dimethylamino)propyl)-2,7-fluorene)-alt-2,7-(9,9-dioctylfluorene)] (PFNR2) with solution-processed cesium fluoride (CsF). The device achieves a maximum luminous efficiency of 17.0 cd A(-1) and a peak power efficiency of 15.6 lm W(-1) at (0.32, 0.37) with a color rendering index of 64.

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Section: Discussionmentioning

confidence: 99%

Highly Efficient, Solution Processed Electrofluorescent Small Molecule White Organic Light-Emitting Diodes with a Hybrid Electron Injection Layer

Jiang

Zhong

Xue

et al. 2014

ACS Appl. Mater. Interfaces

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“… 3–5 The WPLEDs could be prepared from blended systems with different phosphorescent chromophores, however, serious phase separation existed that decreased the electroluminescent (EL) performance. 6–9 In order to overcome this problem, single molecular systems of white-light polymers were designed and synthesized, 10,11 and the possible approach was covalently incorporating modulated ratio of low band-gap chromophores into the blue-emitting polymers to achieve the white light emission.…”

Section: Introductionmentioning

confidence: 99%

Polyfluorene-based white light conjugated polymers incorporating orange iridium(iii) complexes: the effect of steric configuration on their photophysical and electroluminescent properties

Sun

Gao

et al. 2018

RSC Adv.

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“…There is a semiorthogonal solubility between the orthogonal and parallel relationships. For example, the high molecular weight ( M w ) poly(9-vinylcarbazole) (PVK, from Sigma-Aldrich, with an average M w of ∼1 100 000) has good solubility in chlorobenzene but poor solubility in p -xylene, which makes it one of the most popular solution-processable hole-transport layers (HTLs) and electron-blocking layers (EBLs) in PLEDs, because most light emitting polymers are processed from p -xylene solution. ,− In OPVs, by taking advantage of the solubility difference between the donor polymer and [6,6]-phenyl C 61/71 butyric acid methyl ester (PCBM), sequential processing of the donor polymer layer and the PCBM layer is possible, which results in a gradient bulk heterojunction morphology after annealing. , …”

Section: Introductionmentioning

confidence: 99%

An Alkane-Soluble Dendrimer as Electron-Transport Layer in Polymer Light-Emitting Diodes

Zhong

Zhao

Pei

et al. 2016

ACS Appl. Mater. Interfaces

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Polymer light-emitting diodes (PLEDs) have attracted broad interest due to their solution-processable properties. It is well-known that to achieve better performance, organic light-emitting diodes require multilayer device structures. However, it is difficult to realize multilayer device structures by solution processing for PLEDs. Because most semiconducting polymers have similar solubility in common organic solvents, such as toluene, xylene, chloroform, and chlorobenzene, the deposition of multilayers can cause layers to mix together and damage each layer. Herein, a novel semiorthogonal solubility relationship was developed and demonstrated. For the first time, an alkane-soluble dendrimer is utilized as the electron-transport layer (ETL) in PLEDs via a solution-based process. With the dendrimer ETL, the external quantum efficiency increases more than threefold. This improvement in the device performance is attributed to better exciton confinement, improved exciton energy transfer, and better charge carrier balance. The semiorthogonal solubility provided by alkane offers another process dimension in PLEDs. By combining them with water/alcohol-soluble polyelectrolytes, more exquisite multilayer devices can be fabricated to achieve high device performance, and new device structures can be designed and realized.

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Highly efficient blue and all-phosphorescent white polymer light-emitting devices based on polyfluorene host

Cited by 20 publications

References 29 publications

Highly Efficient, Solution Processed Electrofluorescent Small Molecule White Organic Light-Emitting Diodes with a Hybrid Electron Injection Layer

Highly Efficient, Solution Processed Electrofluorescent Small Molecule White Organic Light-Emitting Diodes with a Hybrid Electron Injection Layer

Polyfluorene-based white light conjugated polymers incorporating orange iridium(iii) complexes: the effect of steric configuration on their photophysical and electroluminescent properties

An Alkane-Soluble Dendrimer as Electron-Transport Layer in Polymer Light-Emitting Diodes

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