Emergence of Flexible White Organic Light-Emitting Diodes

Luo, Dongxiang; Chen, Qizan; Liu, Baiquan; Qiu, Ying

doi:10.3390/polym11020384

Cited by 48 publications

(33 citation statements)

References 251 publications

(266 reference statements)

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“…After extensive efforts made by researchers worldwide, the performance of impurity-doped nanocrystal LEDs has been gradually improved. Given the facile solution-processed fabrication procedures, it is believed that impurity-doped nanocrystal LEDs can be well applied to low-cost flexible electronics and transparent products [ 332 , 333 , 334 ]. Additionally, the performance of impurity-doped nanocrystal LEDs is projected to be further enhanced if outcoupling technologies can be used, since only approximate 20% light is extracted from the substrate according to the classical ray optical model [ 335 ].…”

Section: Discussionmentioning

confidence: 99%

Emergence of Impurity-Doped Nanocrystal Light-Emitting Diodes

Luo

Wang

Qiu³

et al. 2020

Nanomaterials

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In recent years, impurity-doped nanocrystal light-emitting diodes (LEDs) have aroused both academic and industrial interest since they are highly promising to satisfy the increasing demand of display, lighting, and signaling technologies. Compared with undoped counterparts, impurity-doped nanocrystal LEDs have been demonstrated to possess many extraordinary characteristics including enhanced efficiency, increased luminance, reduced voltage, and prolonged stability. In this review, recent state-of-the-art concepts to achieve high-performance impurity-doped nanocrystal LEDs are summarized. Firstly, the fundamental concepts of impurity-doped nanocrystal LEDs are presented. Then, the strategies to enhance the performance of impurity-doped nanocrystal LEDs via both material design and device engineering are introduced. In particular, the emergence of three types of impurity-doped nanocrystal LEDs is comprehensively highlighted, namely impurity-doped colloidal quantum dot LEDs, impurity-doped perovskite LEDs, and impurity-doped colloidal quantum well LEDs. At last, the challenges and the opportunities to further improve the performance of impurity-doped nanocrystal LEDs are described.

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Section: Discussionmentioning

confidence: 99%

Emergence of Impurity-Doped Nanocrystal Light-Emitting Diodes

Luo

Wang

Qiu³

et al. 2020

Nanomaterials

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“…Organic Light Emitting Diodes (OLEDs) are light emitting devices that are being used as displays in smartphone, TVs, lighting etc . OLEDs are very flexible, have large color range and contrast, fuller viewing angles and consume lower power . All these features helped them to capture a huge market share for display technologies in recent years .…”

Section: Figurementioning

confidence: 99%

Carbon Quantum Dot as Electron Transporting Layer in Organic Light Emitting Diode

et al. 2019

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Carbon quantum dots derived from banana leaves by a simple hydrothermal process has been used as an electron transport layer to fabricate Organic Light Emitting Diodes. To the best of our knowledge, this is the first report of Carbon QD utilized as an electron transport layer inOLED. Devices with multilayered structureITO/PEDOT: PSS/PFO/CQD/LiF/Al are fabricated on indium tin oxide (ITO) coated glass substrates. Current-Voltage (IÀ V) curves reveal that the turn-on voltages are reduced from 8 V to 6 V as compared with pristine PFO device.Results show CQD as an ETL has enhanced the performance and efficiency of the OLEDs.[a] Md.

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“…Owing to the considerable electronegativity and small ionic radius of the fluorine (F), the PVDF–HFP exhibits a slow recombination rate but high ionic conductivity along the interface between the semiconductor photoanode and the polymer electrolyte in a DSSC [ 11 ]. As of present, the PEO-based electrolytes have been used to boost the ion exchange through two mechanisms: (a) cation complexation and (2) high-rate diffusion of the ion carriers into the amorphous region of the membrane [ 12 , 13 ]. Therefore, blending of these components will lead to higher ionic conductivity by combining the advantages of the polymers, especially in terms of the higher mechanical stability of PVDF–HFP, with the higher diffusion rate of the ion carriers in the amorphous domain of the PEO.…”

Section: Introductionmentioning

confidence: 99%

Microstructural Development and Rheological Study of a Nanocomposite Gel Polymer Electrolyte Based on Functionalized Graphene for Dye-Sensitized Solar Cells

et al. 2020

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For a liquid electrolyte-based dye-sensitized solar cell (DSSC), long-term device instability is known to negatively affect the ionic conductivity and cell performance. These issues can be resolved by using the so called quasi-solid-state electrolytes. Despite the enhanced ionic conductivity of graphene nanoplatelets (GNPs), their inherent tendency toward aggregation has limited their application in quasi-solid-state electrolytes. In the present study, the GNPs were chemically modified by polyethylene glycol (PEG) through amidation reaction to obtain a dispersible nanostructure in a poly(vinylidene fluoride-co-hexafluoro propylene) copolymer and polyethylene oxide (PVDF–HFP/PEO) polymer-blended gel electrolyte. Maximum ionic conductivity (4.11 × 10−3 S cm−1) was obtained with the optimal nanocomposite gel polymer electrolyte (GPE) containing 0.75 wt% functionalized graphene nanoplatelets (FGNPs), corresponding to a power conversion efficiency of 5.45%, which was 1.42% and 0.67% higher than those of the nanoparticle-free and optimized-GPE (containing 1 wt% GNP) DSSCs, respectively. Incorporating an optimum dosage of FGNP, a homogenous particle network was fabricated that could effectively mobilize the redox-active species in the amorphous region of the matrix. Surface morphology assessments were further performed through scanning electron microscopy (SEM). The results of rheological measurements revealed the plasticizing effect of the ionic liquid (IL), offering a proper insight into the polymer–particle interactions within the polymeric nanocomposite. Based on differential scanning calorimetry (DSC) investigations, the decrease in the glass transition temperature (and the resultant increase in flexibility) highlighted the influence of IL and polymer–nanoparticle interactions. The obtained results shed light on the effectiveness of the FGNPs for the DSSCs.

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Emergence of Flexible White Organic Light-Emitting Diodes

Cited by 48 publications

References 251 publications

Emergence of Impurity-Doped Nanocrystal Light-Emitting Diodes

Emergence of Impurity-Doped Nanocrystal Light-Emitting Diodes

Carbon Quantum Dot as Electron Transporting Layer in Organic Light Emitting Diode

Microstructural Development and Rheological Study of a Nanocomposite Gel Polymer Electrolyte Based on Functionalized Graphene for Dye-Sensitized Solar Cells

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