Quantum Dot/Light-Emitting Electrochemical Cell Hybrid Device and Mechanism of Its Operation

Frohleiks, Julia; Wepfer, Svenja; Keleştemur, Yusuf; Demir, Hilmi Volkan; Bacher, G.; Nannen, Ekaterina

doi:10.1021/acsami.6b06833

Cited by 43 publications

(31 citation statements)

References 63 publications

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“…In addition, PEDOT:PSS also serves as the hole injection layer (HIL) for QD‐LECs, as is known from previous studies. [ 22,23,29 ] The entire device fabrication process is performed inside an inert glovebox filled with nitrogen. By exploiting the vertical phase separation between the QD layer and PVK layer the two critical layers of the device could be formed from a single film‐casting step, which allows simplifying the device fabrication.…”

Section: Resultsmentioning

confidence: 99%

“…[ 16–19 ] More recently, attempts have been made to use perovskite‐structured materials (e.g., CsPbBr 3 , [ 20 ] MAPbBr 3 (MA = methylammonium), and FAPbBr 3 (FA = formamidinium) [ 21 ] ) or nanocrystalline semiconductors (e.g., CdSe nanocrystals and CuInS 2 nanocrystals) as luminophores. [ 22–25 ] The latter class of materials, known as quantum dots (QDs), is an interesting category of luminophores that exhibit characteristics highly desirable for light‐emitting device applications. Such characteristics include easy control of the emission wavelength on account of the size‐dependent quantum confinement effect of the material, narrow emission linewidth because of the attainment of monodisperse nanocrystals by well‐established synthetic methods, and a high luminescence quantum yield.…”

Section: Introductionmentioning

confidence: 99%

“…Even though the simplicity of the LEC structure and the excellent optical properties of QDs have been validated separately, only a limited number of studies have been conducted on the use of QDs as the emissive materials of LECs, [ 22–25,29 ] and the resulting performance of the device, e.g., the luminescence efficiency or the maximum luminescence, requires further improvement to ensure practical utility of these devices. This is perhaps because of the challenges in introducing a balanced number of electrons and holes from the simple device structure into the QDs.…”

Section: Introductionmentioning

confidence: 99%

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Light‐Emitting Electrochemical Cells with Polymer‐Blended InP/ZnSeS Quantum Dot Active Layer

Park

Yang

Kim

et al. 2020

Advanced Optical Materials

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A light‐emitting electrochemical cell (LEC) is an innovative device with a simple structure wherein a mixture of a luminophore and an electrolyte is sandwiched between electrodes. Here, LECs are presented which contain an active layer composed of green‐emitting InP/ZnSeS quantum dots (QDs) blended with polyvinyl carbozole p‐type polymer semiconductors and 1‐butyl‐3‐methylimidazolium bis(trifluoromethylsulfonyl)imide ionic liquid (IL). The blending of QDs with polymer semiconductors increases the density of holes reaching the QDs; this, in turn, leads to luminescence from QDs, which is unachievable without the presence of polyvinyl carbazole semiconductor. Moreover, the deposition of a zinc oxide nanoparticle layer onto the QD–polymer–IL active layer increases the density of electrons reaching the QDs. The composition of these materials is varied systematically for balancing the injection rates of electron versus hole into the QDs. A luminance of ≈632 cd m−2 and an efficiency of >1.3 cd A−1 are achieved.

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Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Light‐Emitting Electrochemical Cells with Polymer‐Blended InP/ZnSeS Quantum Dot Active Layer

Park

Yang

Kim

et al. 2020

Advanced Optical Materials

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“…For the past several years, CdTe quantum dots (QDs) have been reconsidered extensively because of their potential for optoelectronic and biological nanoapplications. The unique advantage of colloidal QDs is their size-dependent physical and optical properties such as the energy band gap, narrow emission with small full width at half maximum, broad spectral photo response from ultraviolet to infrared regions, and their compatibility with solution processing [1].…”

Section: Introductionmentioning

confidence: 99%

“…QDs success more significance now a day due to their indicating of nanotechnology applications in the field of laser, bio-imaging, LED, and sensors [1,2]. QDs materials can illustrate tunable photoluminescent property by changing the particle size.…”

Section: Introductionmentioning

confidence: 99%

Applications of Cadmium Telluride (CdTe) in Nanotechnology

Kadim¹

2020

Nanomaterials - Toxicity, Human Health and Environment

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Cadmium telluride quantum dots (CdTe QDs) were prepared by chemical reaction and used to fabricate electroluminescence quantum dot hybrid junction device. QD-LED was fabricated using TPD: PMMA/CdTe/Alq 3 device which synthesized by phase segregation method. The hybrid white light-emitting devices consist of three layers deposited successively on the ITO glass substrate; the first layer was of tetra-phenyl diaminobiphenyl (TPD) polymer mixed with polymethyl methacrylate (PMMA) polymers, while the second layer was 0.5 wt% of the (CdTe) QDs for hybrid device, whereas the third layer was tris (8-hydroxyquinoline) aluminum (Alq 3). The organic light-emitting device (OLED) was considered by room temperature photoluminescence (PL) and electroluminescence (EL). Current-voltage (I-V) characteristics indicate that the output current is good compared to the few voltage (6 V) used which gives good results to generate white light. The electroluminescence (EL) spectrum of hybrid device shows a wide emission band covering the range 350-700 nm. The emissions causing this white luminescence were identified depending on the chromaticity coordinates (CIE 1931): x = 0.32, y = 0.33. The correlated color temperature (CCT) was found to be about 5886 K. Fabrication of EL devices from semiconductor material (CdTe QDs) between two layers, organic polymer (TPD) and organic molecules (Alq), was effective in white light generation. The recombination processes and I-V characteristics give rise to the output current which is good compared to the few voltages used which give good results to generate light.

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Circumventing Dedicated Electrolytes in Light‐Emitting Electrochemical Cells

Bowler

Mishra

Adams

et al. 2020

Adv Funct Materials

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Light-emitting electrochemical cells (LECs) are devices that utilize efficient ion redistribution to produce high efficiency electroluminescence in a simple device architecture. Prototypical polymer LECs utilize three components in the active layer: a luminescent conducting polymer, a salt, and an electrolyte. Similarly, many small molecule LECs also utilize an electrolyte to disperse salts. In these systems, the electrolyte is incorporated to efficiently conduct ions and to maintain phase compatibility between all components. However, certain LEC approaches and materials systems enable device operation without a dedicated electrolyte. This review describes the general methods and materials used to circumvent the use of a dedicated electrolyte in LECs. The techniques of synthetically coupling electrolytes, incorporating ionic liquids, and introducing inorganic salts are presented in view of research efforts to date. The use of these techniques in emerging classes of light emitting electrochemical cells is also discussed. These approaches have yielded some of the most efficient, long-lasting and commercially applicable LECs to date.Received: ((will be filled in by the editorial staff))Revised: ((will be filled in by the editorial staff))

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Quantum Dot/Light-Emitting Electrochemical Cell Hybrid Device and Mechanism of Its Operation

Cited by 43 publications

References 63 publications

Light‐Emitting Electrochemical Cells with Polymer‐Blended InP/ZnSeS Quantum Dot Active Layer

Light‐Emitting Electrochemical Cells with Polymer‐Blended InP/ZnSeS Quantum Dot Active Layer

Applications of Cadmium Telluride (CdTe) in Nanotechnology

Circumventing Dedicated Electrolytes in Light‐Emitting Electrochemical Cells

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