Highly luminescent polystyrene embedded CdSe quantum dots obtained through a modified colloidal synthesis route

Stan, Corneliu Sergiu; Secula, Marius Sebastian; Sibiescu, Doina

doi:10.1007/s13391-012-1108-0

Cited by 18 publications

(8 citation statements)

References 35 publications

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“…In previous reports related to colloidal nanocrystal quantum dots (QDs), the use of nonuniform CdSe (ZnS) nanocrystal QD film has led to imbalanced charge injections and low luminance efficiency of QD‐based LEDs . Stan et al dispersed nanocrystal QDs within a polymer matrix of polystyrene or poly(methyl methacrylate) (PMMA), with the nanocrystal QD:polymer composite film showing a uniform morphology with excellent properties, such as good electrical and optical properties, robust chemical resistance, good thermal stability and easy processability, leading to improved stability and performance of devices . Much effort has been made to obtain uniform nanocrystal QD film using an adequate deposition method, such as drop‐casting, dip‐ or spray‐coating, the Langmuir–Blodgett method, and the doctor‐blade method.…”

Section: Summary Of the Device Performance Of Penleds With Cspbbr3 Namentioning

confidence: 99%

Enhancing the Performance and Stability of Perovskite Nanocrystal Light‐Emitting Diodes with a Polymer Matrix

Lee

Kim

et al. 2017

Adv Materials Technologies

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efficiency (EQE) values of the devices have increased from 0.12% to 3.8% for green emission and to 5.7% for red emission. [10][11][12][13][14][15][16][17][18] Recently, bulk film-based perovskite LEDs have been reported to reach high EQEs of 8.53% for green emission and 11.7% for near-infrared emission; however, the issues of long-term device stability and photoluminescence (PL)/electroluminescence (EL) blinking emission should be resolved before the commercial application of these materials can be realized. [19][20][21][22][23][24][25][26][27][28] Fortunately, CsPbX 3 perovskite nanocrystals exhibit lower levels of PL blinking and greater device stability compared to bulk film-based perovskite. For these reasons, they hold great potential in LED applications despite their low device efficiency. [29,30] In previous reports related to colloidal nanocrystal quantum dots (QDs), the use of nonuniform CdSe (ZnS) nanocrystal QD film has led to imbalanced charge injections and low luminance efficiency of QD-based LEDs. [31] Stan et al. dispersed nanocrystal QDs within a polymer matrix of polystyrene or poly(methyl methacrylate) (PMMA), [32] with the nanocrystal QD:polymer composite film showing a uniform morphology with excellent properties, such as good electrical and optical properties, robust chemical resistance, good thermal stability and easy processability, leading to improved stability and performance of devices. [33][34][35][36] Much effort has been made to obtain uniform nanocrystal QD film using an adequate deposition method, such as drop-casting, dip-or spray-coating, the Langmuir-Blodgett method, and the doctor-blade method. These deposition methods can be used to obtain highly uniform nanocrystal film, thus increasing device performance levels. [37][38][39][40] Recently, Pan et al. reported a high efficiency CsPbBr 3 -based PeNLED with an EQE of 3.0% for green emission using a ligand exchange process to passivate CsPbBr 3 nanocrystals. [41] The passivation of the CsPbBr 3 nanocrystals through the ligand exchange also exhibited stable amplified spontaneous emission. [42] These reports demonstrate that the ligand exchange method in nanocrystals can enhance the performance and stability of perovskite nanocrystal-based optoelectronic devices through the passivation of the perovskite nanocrystals.Here, we successfully fabricate efficient CsPbBr 3 -based PeNLEDs using a monolayered CsPbBr 3 nanocrystal film with All-inorganic perovskite nanocrystal materials exhibit excellent light-emitting properties in the visible range with narrow-band emissions, relatively high stability levels, and high photoluminescence quantum efficiency. A uniform morphology of perovskite nanocrystal film is necessary to realize highly efficient light-emitting devices, but the morphology of CsPbX 3 nanocrystal films has not been intensively studied. Here, a novel method is presented to obtain uniform and stable CsPbBr 3 nanocrystal film through a drop-casting method with a poly(methyl methacrylate) (PMMA) matrix. The introduction of CsPbB...

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Section: Summary Of the Device Performance Of Penleds With Cspbbr3 Namentioning

confidence: 99%

Enhancing the Performance and Stability of Perovskite Nanocrystal Light‐Emitting Diodes with a Polymer Matrix

Lee

Kim

et al. 2017

Adv Materials Technologies

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“…27 With these precursors, many researchers were able to achieve a high fluorescence quantum yield up to 80%. 28,29 However, the high toxicity, and inflammable and explosive nature of TOPO lead to the development of phosphine-free synthesis of CdSe QDs using Cd precursor and Se powder with a quantum yield reduced to 50%. Later on, the quantum yield of Cd-based QDs was enhanced by structural modification and the introduction of core-shell QDs.…”

Section: Introductionmentioning

confidence: 99%

Gateway towards recent developments in quantum dot-based light-emitting diodes

et al. 2022

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“…2 Photoluminescent polymers are gaining interest in many applications, such as advertisement cards, playtoys, safety indicators, and luminous paints, due to the quality of emitted light and the ease of production. [3][4][5] Photoluminescent materials use photons as the energy source and can be separated into two subclasses: fluorescence and phosphorescence. Phosphorescence, focused in the present study, is a term of light emission of specific de-excitation process.…”

Section: Introductionmentioning

confidence: 99%

Mechanical, morphological, and luminescent properties of strontium phosphorescent filler-filled NR/PP/PEC blends as affected by processing design

Thitithammawong

Chuycherd

Leekharee

et al. 2019

Journal of Elastomers & Plastics

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Photoluminescent material was successfully prepared by blending europium-doped strontium aluminate phosphorescent filler (SrAl2O4:Eu2+) with terpolymer of natural rubber/polypropylene/propylene–ethylene copolymer (NR/PP/PEC). The influence of alternative processing design, that is, mixing method (simple blend (SB) or dynamic vulcanization (DV)) and mixing sequence (direct method or precompounding method) on mechanical, morphological, and photoluminescent properties of the SrAl2O4:Eu2+-filled NR/PP/PEC blends, was systematically studied. The results revealed that mechanical and photoluminescent properties can be improved by the control of rubber vulcanization and phase morphology. The dynamically vulcanized blends (DV1 and DV2), in which the NR phase was vulcanized during melt mixing under high shear and had vulcanized NR particles dispersed in the continuous PP and PEC matrices, showed superior mechanical and photoluminescent properties over the SB with co-continuous phase morphology. Controlled location of rubber additives in the NR phase by precompounding (DV2) gave the highest light emission intensity with the longest decay time.

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Highly luminescent polystyrene embedded CdSe quantum dots obtained through a modified colloidal synthesis route

Cited by 18 publications

References 35 publications

Enhancing the Performance and Stability of Perovskite Nanocrystal Light‐Emitting Diodes with a Polymer Matrix

Enhancing the Performance and Stability of Perovskite Nanocrystal Light‐Emitting Diodes with a Polymer Matrix

Gateway towards recent developments in quantum dot-based light-emitting diodes

Mechanical, morphological, and luminescent properties of strontium phosphorescent filler-filled NR/PP/PEC blends as affected by processing design

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