Colloidal quantum dot light-emitting diodes employing solution-processable tin dioxide nanoparticles in an electron transport layer

Park, Myeongjin; Song, Jiyun; An, Myungchan; Lim, Jaehoon; Lee, Changhee; Roh, Jeongkyun; Lee, Donggu

doi:10.1039/d0ra00653j

Cited by 17 publications

(11 citation statements)

References 20 publications

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“…We chose SnO 2 NPs for the second electron injection layer because of their excellent solution processability, high transparency in the visible region ( Figure S1), which is similar to ZnO NPs, and decent electron-transport properties as evidenced by the previous employment in perovskite solar cells [28] and organic light-emitting diodes [29]. In addition, in our recent study [20], we have examined the use of SnO 2 NPs for the ETL in QD-LEDs, and found out SnO 2 NPs have favorable interfacial properties with QDs that do not induce spontaneous electron injection; SnO 2 NPs have lower conduction band minimum (CBM) (see Figure 1b) and lower carrier concentration compared to ZnO NPs. In order to take advantage of SnO 2 NPs while maintaining an excellent electron transporting ability of the standard ZnO-based ETL, we propose a new ETL platform comprising the stack of ZnO and SnO 2 NPs.…”

Section: Resultsmentioning

confidence: 99%

“…The efficiency of QD-based light-emitting diodes (QD-LEDs) has been improved steadily over the past two decades, and one of the most important breakthroughs was made by employing a metal oxide semiconductor in the electron transport layer (ETL). Suitable energy levels and high electron mobility of metal oxide semiconductors led to efficient charge injection and transport, thereby resulting in notable progress in the luminescence efficiency of QD-LEDs [17][18][19][20]. Various types of metal oxide semiconductors have been employed and investigated, and among those metal oxide semiconductors, 2 of 9 zinc oxide (ZnO) has been the most widely employed because of their easy processability, excellent electrical properties, and transparency [21,22].…”

Section: Introductionmentioning

confidence: 99%

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Double Metal Oxide Electron Transport Layers for Colloidal Quantum Dot Light-Emitting Diodes

et al. 2020

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The performance of colloidal quantum dot light-emitting diodes (QD-LEDs) have been rapidly improved since metal oxide semiconductors were adopted for an electron transport layer (ETL). Among metal oxide semiconductors, zinc oxide (ZnO) has been the most generally employed for the ETL because of its excellent electron transport and injection properties. However, the ZnO ETL often yields charge imbalance in QD-LEDs, which results in undesirable device performance. Here, to address this issue, we introduce double metal oxide ETLs comprising ZnO and tin dioxide (SnO2) bilayer stacks. The employment of SnO2 for the second ETL significantly improves charge balance in the QD-LEDs by preventing spontaneous electron injection from the ZnO ETL and, as a result, we demonstrate 1.6 times higher luminescence efficiency in the QD-LEDs. This result suggests that the proposed double metal oxide ETLs can be a versatile platform for QD-based optoelectronic devices.

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Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Double Metal Oxide Electron Transport Layers for Colloidal Quantum Dot Light-Emitting Diodes

et al. 2020

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“…Other factors affecting their performance include a high electron mobility, an amorphous morphology, a high glass transition temperature, and the ability to be deposited as a uniform thin film. Some of the commonly used polymers and metal oxides for ETL are PBD, PBD-PMMA, BND, ZnO, SnO 2 , and TiO 2 [69][70][71].…”

Section: Enhancing Electron Mobility: Electron Transport and Injection Layersmentioning

confidence: 99%

Assessment of the optical and electrical properties of light-emitting diodes containing carbon-based nanostructures and plasmonic nanoparticles: a review

Nagpal¹,

Rauwel²,

Ducroquet³

et al. 2021

Beilstein J. Nanotechnol.

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Light-emitting diodes (LED) are widely employed in display applications and lighting systems. Further research on LED that incorporates carbon nanostructures and metal nanoparticles exhibiting surface plasmon resonance has demonstrated a significant improvement in device performance. These devices offer lower turn-on voltages, higher external quantum efficiencies, and luminance. De facto, plasmonic nanoparticles, such as Au and Ag have boosted the luminance of red, green, and blue emissions. When combined with carbon nanostructures they additionally offer new possibilities towards lightweight and flexible devices with better thermal management. This review surveys the diverse possibilities to combine various inorganic, organic, and carbon nanostructures along with plasmonic nanoparticles. Such combinations would allow an enhancement in the overall properties of LED.

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“…II-VI semiconducting nanomaterials have attracted a lot of attention owing to their potential applications in light emitting diodes [1][2][3], solar cells [4] and optical devices [5]. Cadmium sulfide (CdS) is one of the most studied semiconductors with a direct band gap of 2.42 eV.…”

Section: Introductionmentioning

confidence: 99%

Comparative study on the effect of precursors on the morphology and electronic properties of CdS nanoparticles

et al. 2021

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Cadmium dithiocarbamate and cadmium ethyl xanthate complexes were synthesized and characterized by microanalysis, Fourier transform infrared (FT-IR) spectroscopy and thermogravimetric analyses. The complexes were employed as molecular precursors for the fabrication of CdS nanoparticles in hexadecylamine (HDA) and oleylamine (OLA) at a temperature of 250 °C. Spherical and oval shaped particles with sizes ranging from 9.93 ± 1.89 to 16.74 ± 2.78 nm were obtained in OLA while spherical, oval and rod shaped particles with sizes ranging from 9.40 ± 1.65 to 29.90 ± 5.32 nm were obtained in HDA. Optical properties of the nanoparticles showed blue shifts as compared to the bulk CdS, with the OLA capped nanoparticles slightly more blue shifted than the corresponding HDA capped nanoparticles. Results of crystallinity patterns revealed hexagonal phase of CdS.

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Colloidal quantum dot light-emitting diodes employing solution-processable tin dioxide nanoparticles in an electron transport layer

Abstract: QD-LEDs have gained tremendous attention to potentially replace current emissive display technologies. Here, we explore solution-processable SnO2 nanoparticles (NPs) as alternatives to ZnO for the electron transporting layer in QD-LEDs.

Cited by 17 publications

References 20 publications

Double Metal Oxide Electron Transport Layers for Colloidal Quantum Dot Light-Emitting Diodes

Double Metal Oxide Electron Transport Layers for Colloidal Quantum Dot Light-Emitting Diodes

Assessment of the optical and electrical properties of light-emitting diodes containing carbon-based nanostructures and plasmonic nanoparticles: a review

Comparative study on the effect of precursors on the morphology and electronic properties of CdS nanoparticles

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