Doped copper phthalocyanine via an aqueous solution process for high-performance organic light-emitting diodes

Ma, Yuechao; Hua, Xiao-Chen; Zhai, Tianyu; Li, Yi-Huan; Duhm, Steffen; Fung, Man‐Keung

doi:10.1016/j.orgel.2019.02.019

Cited by 22 publications

(15 citation statements)

References 28 publications

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“…Phthalocyanines and their metal complexes have been considered versatile molecules, with remarkable optical and lasing properties, thermal and chemical stabilities [8], with maximum light absorption occurring in the visible region as well as being capable of producing singlet oxygen with high quantum yields [9]. Moreover, they have shown several extents of applicability in the fields of solar cells [10], liquid crystals [11] and as systems for fabrication of organic light-emitting diodes (OLED) [12]. Phthalocyanines consist of an aromatic macrocycle with an extensive conjugated π-electron system that can be readily modified by central coordination of metal atoms and peripheral substitution on the phthalocyanine ring, either by electron-donating or withdrawing groups [13,14].…”

Section: Introductionmentioning

confidence: 99%

Nanomaterials Based on Fe3O4 and Phthalocyanines Derived from Cashew Nut Shell Liquid

et al. 2019

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In this work we report the synthesis of new hybrid nanomaterials in the core/shell/shell morphology, consisting of a magnetite core (Fe3O4) and two consecutive layers of oleic acid (OA) and phthalocyanine molecules, the latter derived from cashew nut shell liquid (CNSL). The synthesis of Fe3O4 nanoparticle was performed via co-precipitation procedure, followed by the nanoparticle coating with OA by hydrothermal method. The phthalocyanines anchorage on the Fe3O4/OA core/shell nanomaterial was performed by facile and effective sonication method. The as obtained Fe3O4/OA/phthalocyanine hybrids were investigated by Fourier transform infrared spectroscopy, X-ray diffraction, UV-visible spectroscopy, transmission electron microscopy (TEM), thermogravimetric analysis and magnetic measurements. TEM showed round-shaped nanomaterials with sizes in the range of 12–15 nm. Nanomaterials presented saturation magnetization (Ms) in the 1–16 emu/g and superparamagnetic behavior. Furthermore, it was observed that the thermal stability of the samples was directly affected by the insertion of different transition metals in the ring cavity of the phthalocyanine molecule.

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Section: Introductionmentioning

confidence: 99%

Nanomaterials Based on Fe3O4 and Phthalocyanines Derived from Cashew Nut Shell Liquid

et al. 2019

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“…Although the doped polymer anode induced luminescence and current density levels comparable to those induced by the ITO-based anode, it exhibited comparably lower external quantum efficiency values, which might have been caused by the unbalanced charge carrier injection resulting from the injection of too many holes from the highly conductive polymer due to the well-matched energy levels. Despite the aforementioned issue, these results also showed that 10-wt%-MR doping could effectively improve the work function of PEDOT:PSS, leading to enhanced and stable hole injection, which has a crucial role in the performance of blue PhOLEDs [12].…”

Section: Resultsmentioning

confidence: 87%

“…Furthermore, the poor chemical stability of ITO [3,7] has also led to an increased interest in other suitable materials, such as graphene, metal nanowires and nanoparticles, carbon nanotubes (CNTs), and conductive polymers [7,9,11]. In addition, there is an energy disparity between the work function of ITO and the highest occupied molecular orbital (HOMO) of the organic hole-transporting materials, which leads to a large barrier impeding hole injection from ITO and eventually adversely affects the device performance and lifetime [3,12]. Several approaches have been reported to facilitate hole injection in ITO-based OLEDs, including surface treatment methods and insertion of an additional layer to alleviate the energy barrier between the anode and organic layers [12,13].…”

Section: Introductionmentioning

confidence: 99%

“…In addition, there is an energy disparity between the work function of ITO and the highest occupied molecular orbital (HOMO) of the organic hole-transporting materials, which leads to a large barrier impeding hole injection from ITO and eventually adversely affects the device performance and lifetime [3,12]. Several approaches have been reported to facilitate hole injection in ITO-based OLEDs, including surface treatment methods and insertion of an additional layer to alleviate the energy barrier between the anode and organic layers [12,13]. These, however, all lead to higher production costs and more complex device structures, which demand more construction time [3,4,14].…”

Section: Introductionmentioning

confidence: 99%

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Solution-processed colored electrodes for ITO-free blue phosphorescent organic light-emitting diodes

Huseynova

Lim

Gasonoo

et al. 2020

Journal of Information Display

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Reported herein are solution-processed polymer anode electrodes for blue phosphorescent organic light-emitting diodes (PhOLEDs). The highly conductive anodes were made from 10-wt%-methylred-(MR)-doped poly(3,4-ethylenedioxythiophene):poly(styrenesulfonate) (PEDOT:PSS) (PH1000) films. The red-colored and uniform polymer films demonstrated electrical conductivity values that significantly increased from 0.25 to 50 S•cm −1 after doping. The more than 200-fold enhancement in conductivity indicates that the doped films have a lower sheet resistance and better hole injection and transport properties than the pristine films. The resultant PhOLEDs based on the doped polymer anodes exhibited stable, broad, and intense blue emission at 468 nm with a 2616 cd•m −2 maximum luminance and a 4 V turn-on voltage. The obtained study results confirmed the effectiveness of the MR dye as a dopant for the significant enhancement of the conductivity and effective hole injection of PEDOT:PSS. Efficient future flexible optoelectronic applications can be built using this highly conductive polymer electrode obtained via a simple, solution-processed, and cost-effective doping approach.

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“…The values of surface roughness (RMS) of neat PEDOT:PSS, PEDOT:PSS/10%ZnS QDs and PEDOT:PSS/10%MoS 2 QDs film are 0.57, 0.47, and 0.69 nm, respectively. The hybrid HIL films exhibit a low surface roughness, which result in more efficient hole injection and consequently affect the HTL and device performance ( Kim et al, 2019 ; Ma et al, 2019 ).…”

Section: Resultsmentioning

confidence: 99%

Use of Hybrid PEDOT:PSS/Metal Sulfide Quantum Dots for a Hole Injection Layer in Highly Efficient Green Phosphorescent Organic Light-Emitting Diodes

et al. 2021

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In this study, we have synthesized the molybdenum sulfide quantum dots (MoS2 QDs) and zinc sulfide quantum dots (ZnS QDs) and demonstrated a highly efficient green phosphorescent organic light-emitting diode (OLED) with hybrid poly (3,4-ethylenedioxythiophene)/poly (styrenesulfonate) (PEDOT:PSS)/QDs hole injection layer (HIL). The electroluminescent properties of PEDOT:PSS and hybrid HIL based devices were explored. An optimized OLED based on the PEDOT:PSS/MoS2 QDs HIL exhibited maximum current efficiency (CE) of 72.7 cd A−1, which shows a 28.2% enhancement as compared to counterpart with single PEDOT:PSS HIL. The higher device performance of OLED with hybrid HIL can be attributed to the enhanced hole injection capacity and balanced charge carrier transportation in the OLED devices. The above analysis illustrates an alternative way to fabricate the high efficiency OLEDs with sulfide quantum dots as a HIL.

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Doped copper phthalocyanine via an aqueous solution process for high-performance organic light-emitting diodes

Cited by 22 publications

References 28 publications

Nanomaterials Based on Fe3O4 and Phthalocyanines Derived from Cashew Nut Shell Liquid

Nanomaterials Based on Fe3O4 and Phthalocyanines Derived from Cashew Nut Shell Liquid

Solution-processed colored electrodes for ITO-free blue phosphorescent organic light-emitting diodes

Use of Hybrid PEDOT:PSS/Metal Sulfide Quantum Dots for a Hole Injection Layer in Highly Efficient Green Phosphorescent Organic Light-Emitting Diodes

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