High‐Performance All‐Polymer White‐Light‐Emitting Diodes Using Polyfluorene Containing Phosphonate Groups as an Efficient Electron‐Injection Layer

Zhang, Baohua; Qin, Chuanjiang; Ding, Junqiao; Chen, Lei; Xie, Zhiyuan; Cheng, Yanxiang; Wang, Lixiang

doi:10.1002/adfm.201000538

Cited by 90 publications

(48 citation statements)

References 54 publications

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“…The optimized device performance indicated that PDIP layer could improve electron transport effectively. As previously reported, the interaction of phosphate group in PDIP molecule with Al electrode favored reducing electroninjection barrier in polymer light-emitting diodes [28][29][30], which implies that the insertion of PDIP layer should effectively lower the work function of the cathodes as well. However, it should be noted that the optimum thickness of PDIP layer used here is much larger (around 20 nm) than that of organic interfacial materials reported before [11].…”

Section: Optimization Of Photovoltaic Devices After Incorporation Of mentioning

confidence: 63%

An alcohol-soluble perylene diimide derivative as cathode interfacial layer for PDI-based nonfullerene organic solar cells

Wang

et al. 2015

Colloids and Surfaces A: Physicochemical and Engineering Aspect

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Section: Optimization Of Photovoltaic Devices After Incorporation Of mentioning

confidence: 63%

An alcohol-soluble perylene diimide derivative as cathode interfacial layer for PDI-based nonfullerene organic solar cells

Wang

et al. 2015

Colloids and Surfaces A: Physicochemical and Engineering Aspect

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“…Tremendous advances have been achieved [2][3][4], mainly through the replacement of the fluorescent emitters by phosphorescent ones [5,6]. Indeed, in these devices, both electro-generated singlet and triplet excitons contribute to light emission, enabling to reach an internal quantum efficiency of 100% [7,8].…”

Section: Introductionmentioning

confidence: 99%

Solution-processed blue phosphorescent OLEDs with carbazole-based polymeric host materials

Dumur

Beouch

Péralta

et al. 2015

Organic Electronics

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“…Such observations of charge trapping was observed for white light emitting single polymers with covalent dopants in 15 main and side chains as well. 63 In the present case, it is clear from the band diagram (Figure 6 (c)) that the energy levels of FCP units are offset from that of poly(9,9-dihexylfluorene-2,7-diyl) and hence reduced charge trapping.…”

Section: Electroluminescence Characteristics and Decreased Charge Tramentioning

confidence: 53%

White light emitting single polymer from aggregation enhanced emission: a strategy through supramolecular assembly

et al. 2015

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Aggregation Induced Emission Enhancement (AIEE) is widely regarded as an efficient tool to offset the problem of Aggregation Caused Quenching (ACQ) in luminogens. ACQ phenomenon in small organic molecules and polymers are detrimental to the performance of OLEDs. An efficient pure white 10 electroluminescence (EL) was obtained by copolymerization of 9,9-dihexylfluorene as a blue host with (E)-2,7-dibromo-9H-fluoren-9-yl-2-cyano-3-(dimethylamino)phenyl)acrylate (FCP) as a yellow emitting covalent dopant with AIEE property on the main chain of the copolymers have been designed and synthesized. White light emission was achieved in copolymer FCP 2.5 that contained 2.5% of the AIEE luminogen. Interestingly the copolymers exhibited enhanced emission upon aggregation even in low 15 composition of FCP. The enhanced emission in the copoloymers is attributed to the supramolecular assembly of polymeric chains. A density functional (DFT) and time-dependent density functional theory (TD-DFT) investigation on the monomer and copolymers of FCP revealed that the presence of an intramolecular charge transfer (ICT) transition between dimethylamine to cyanoacrylic acid unit. OLEDs were fabricated using device with the structure of ITO/PEDOT:PSS/EML/Al. White light 20 emitting diodes were fabricated from FCP 2.5 as a Emissive layer (EML) elicited a white electroluminescence with Commission internationale de l'Eclairage (CIE) of (0.33, 0.34) and shows the maximum brightness of nearly 9332 cd m -2 , power efficiency of 4.13 lm W -1 , luminous efficiency of 6.34 cd A -1 . Interestingly, the supramolecular ordering in FCP 2.5 considerably reduces the charge trapping which results in reproducible white light emission. 25 65 effect was largely attributed to charge trapping. Charge trapping also resulted in superfluous energy cascade that could only This journal is © The Royal Society of Chemistry [year] 65 FCP 25, and FCP 50 (with higher FCP content in main chain) were observed at 373, 380, 386 and 383 nm respectively. The above polymers elicited a low energy shoulder observed at around 432 nm that is characteristic of FCP units was 70

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High‐Performance All‐Polymer White‐Light‐Emitting Diodes Using Polyfluorene Containing Phosphonate Groups as an Efficient Electron‐Injection Layer

Cited by 90 publications

References 54 publications

An alcohol-soluble perylene diimide derivative as cathode interfacial layer for PDI-based nonfullerene organic solar cells

An alcohol-soluble perylene diimide derivative as cathode interfacial layer for PDI-based nonfullerene organic solar cells

Solution-processed blue phosphorescent OLEDs with carbazole-based polymeric host materials

White light emitting single polymer from aggregation enhanced emission: a strategy through supramolecular assembly

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