Efficiency enhancement in a single emission layer yellow organic light emitting device: Contribution of CIS/ZnS quantum dot

Demir, Nuriye; Öner, Ilker; Varlıklı, Canan; Ozsoy, Cihan; Zafer, Ceylan

doi:10.1016/j.tsf.2015.05.006

Cited by 21 publications

(15 citation statements)

References 42 publications

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“…Unlike binary copper chalcogenides, ternary I–III–VI materials display tunable photoluminescence (PL) and are, therefore, promising alternatives to Cd and Pb chalcogenide NCs in several applications, such as light‐emitting diodes, photovoltaics, luminescent solar concentrators, bioimaging, and photocatalysis . Some of these potential applications will be addressed in more detail in Section 3.3.…”

Section: Ternary Copper Chalcogenidesmentioning

confidence: 99%

“…For example, green‐emitting (PL max =501 nm) AgInS 2 /ZnS and red‐emitting (PL max =606 nm) CIS/ZnS alloyed core–shell NCs have been recently used as spectral down‐converters in combination with a blue LED to produce warm white LEDs (CRI=94–97) (Figure ) . Extensive research has also been performed into ways to produce optically transparent composites of CIS NCs and polymers (including light‐emitting conducting polymers) . One important question that has not yet been addressed for CIS NCs is the thermal quenching of its PL.…”

Section: Ternary Copper Chalcogenidesmentioning

confidence: 99%

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Prospects of Colloidal Copper Chalcogenide Nanocrystals

2016

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Over the past few years, colloidal copper chalcogenide nanocrystals (NCs) have emerged as promising alternatives to conventional Cd and Pb chalcogenide NCs. Owing to their wide size, shape, and composition tunability, Cu chalcogenide NCs hold great promise for several applications, such as photovoltaics, lighting and displays, and biomedical imaging. They also offer characteristics that are unparalleled by Cd and Pb chalcogenide NCs, such as plasmonic properties. Moreover, colloidal Cu chalcogenide NCs have low toxicity, potentially lower costs, and excellent colloidal stability. This makes them attractive materials for the large-scale deployment of inexpensive, sustainable, and environmentally benign solution-processed devices. Nevertheless, the synthesis of colloidal Cu chalcogenide NCs, especially that of ternary and quaternary compositions, has yet to reach the same level of mastery as that available for the prototypical Cd chalcogenide based NCs. This review provides a concise overview of this rapidly advancing field, sketching the state of the art and highlighting the key challenges. We discuss recent developments in the synthesis of size-, shape-, and composition-controlled NCs of Cu chalcogenides, with emphasis in strategies to circumvent the limitations arising from the need to precisely balance the reactivities of multiple precursors in synthesizing ternary and quaternary compositions. In this respect, we show that topotactic cation-exchange reactions are a promising alternative route to complex multinary Cu chalcogenide NCs and hetero-NCs, which are not attainable by conventional routes. The properties and potential applications of Cu chalcogenide NCs and hetero-NCs are also addressed.

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Section: Ternary Copper Chalcogenidesmentioning

confidence: 99%

Section: Ternary Copper Chalcogenidesmentioning

confidence: 99%

Prospects of Colloidal Copper Chalcogenide Nanocrystals

2016

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“…ITO substrates were etched and cleaned by the general method [32,33]. All PEDOT:PSS-GO composites were used as the HIL of the OLED with the structure of ITO/PEDOT:PSS-GO(y40 nm)/ ADS231BE(y 60 nm)/Cs 2 CO 3 (3 nm)/Al(100 nm).…”

Section: Preparation Of Pedot:pss-go Composites and Their Utilization In Oledmentioning

confidence: 99%

Controlling the distribution of oxygen functionalities on GO and utilization of PEDOT:PSS-GO composite as hole injection layer of a solution processed blue OLED

Diker

Durmaz

Bozkurt

et al. 2017

Current Applied Physics

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Graphene oxide (GO) was synthesis by Tour method. Particle size distribution effects of raw graphite on the resulting structural, morphological, optical and electrical properties of GO samples and their poly (3,4-ethylenedioxythiophene):poly(styrenesulfonate) (PEDOT:PSS) composites are studied for the graphite particle distributions of <150, 45e75 and 25e45 mm. It is determined that particle size of raw graphite have an impact on oxidation degree, the chemical nature of oxygen functional groups on GO and it also affects the lateral size of obtained GO.PEDOT:PSS-GO composites are utilized as hole injection layer (HIL) in a solution process blue organic light emitting diode. Presence of GO caused negative differential resistance (NDR) and NDR intensity was decreased with the decrease in lateral size of GO, increase in the graphite particle size and carboxyl% of obtained GO. All PEDOT:PSS-GO composite based devices presented better performance than the bare PEDOT:PSS based reference device. The maximum luminous and external quantum efficiency values of the device that contain HIL of PEDOT:PSS-GO(150) were more than 40% and 50% higher than that of the reference, respectively. Two folds of increase in these performance values were able to be reached with the concentration optimization of GO/150 in PEDOT:PSS.

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“…This has motivated increasing research effort into compositions based on less toxic elements while possessing similar properties. Copper indium sulfide (CuInS 2 , CIS) NCs show size-dependent photoluminescence (PL) in the red to near-infrared spectral window and large absorption coefficients and are therefore a promising alternative for lead or cadmium chalcogenide NCs in applications such as light-emitting diodes, − photovoltaics, − luminescent solar concentrators, , and bioimaging. , However, the low PL quantum yields (QYs) of bare CIS NCs (typically below 5%) preclude their direct application. Improvement of the PL QYs can be achieved by overcoating the NCs with a shell of wide band gap semiconductors. ,,− To date, the best results have been reported for CIS/CdS core/shell NCs, which show PL QYs up to 86%, , while for CIS/ZnS core/shell NCs, PL QYs up to 70% have been reported. , Alternative strategies to obtain high PL QY CIS-based core/shell NCs employing exclusively cadmium-free materials are desired but have not yet been devised.…”

mentioning

confidence: 99%

Radiative and Nonradiative Recombination in CuInS₂ Nanocrystals and CuInS₂-Based Core/Shell Nanocrystals

Berends

Rabouw

Spoor

et al. 2016

J. Phys. Chem. Lett.

130

246

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Luminescent copper indium sulfide (CIS) nanocrystals are a potential solution to the toxicity issues associated with Cd- and Pb-based nanocrystals. However, the development of high-quality CIS nanocrystals has been complicated by insufficient knowledge of the electronic structure and of the factors that lead to luminescence quenching. Here we investigate the exciton decay pathways in CIS nanocrystals using time-resolved photoluminescence and transient absorption spectroscopy. Core-only CIS nanocrystals with low quantum yield are compared to core/shell nanocrystals (CIS/ZnS and CIS/CdS) with higher quantum yield. Our measurements support the model of photoluminescence by radiative recombination of a conduction band electron with a localized hole. Moreover, we find that photoluminescence quenching in low-quantum-yield nanocrystals involves initially uncoupled decay pathways for the electron and hole. The electron decay pathway determines whether the exciton recombines radiatively or nonradiatively. The development of high-quality CIS nanocrystals should therefore focus on the elimination of electron traps.

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Efficiency enhancement in a single emission layer yellow organic light emitting device: Contribution of CIS/ZnS quantum dot

Cited by 21 publications

References 42 publications

Prospects of Colloidal Copper Chalcogenide Nanocrystals

Prospects of Colloidal Copper Chalcogenide Nanocrystals

Controlling the distribution of oxygen functionalities on GO and utilization of PEDOT:PSS-GO composite as hole injection layer of a solution processed blue OLED

Radiative and Nonradiative Recombination in CuInS₂ Nanocrystals and CuInS₂-Based Core/Shell Nanocrystals

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Efficiency enhancement in a single emission layer yellow organic light emitting device: Contribution of CIS/ZnS quantum dot

Cited by 21 publications

References 42 publications

Prospects of Colloidal Copper Chalcogenide Nanocrystals

Prospects of Colloidal Copper Chalcogenide Nanocrystals

Controlling the distribution of oxygen functionalities on GO and utilization of PEDOT:PSS-GO composite as hole injection layer of a solution processed blue OLED

Radiative and Nonradiative Recombination in CuInS2 Nanocrystals and CuInS2-Based Core/Shell Nanocrystals

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Radiative and Nonradiative Recombination in CuInS₂ Nanocrystals and CuInS₂-Based Core/Shell Nanocrystals