Structural control of InP/ZnS core/shell quantum dots enables high-quality white LEDs

Kumar, Baskaran Ganesh; Sadeghi, Sadra; Melikov, Rustamzhon; Aria, Mohammad Mohammadi; Jalali, Houman Bahmani; Ow‐Yang, Cleva W.; Nizamoğlu, Sedat

doi:10.1088/1361-6528/aac8c9

Cited by 33 publications

(21 citation statements)

References 60 publications

(69 reference statements)

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“…To fabricate LEDs capable of incorporating proteins in liquid‐state, we used an encapsulation method, which holds the proteins solution on top of the blue LED chips. [ 11,30,31 ] For that, we designed and cured a hemispherical polydimethylsiloxane (PDMS) polymeric lens with the inner and outer diameters of 7 and 9 mm (Figure 3e‐inset). At the next stage, the cured PDMS lens was placed on top of the LED (Figure 3e), and was fixed by using the UV curable resin and subsequent UV illumination (Figure 3f).…”

Section: Resultsmentioning

confidence: 99%

Ultra‐Efficient and High‐Quality White Light‐Emitting Devices using Fluorescent Proteins in Aqueous Medium

Sadeghi

Melikov

Conkar

et al. 2020

Adv Materials Technologies

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The transformation of electronics toward “green” and efficient devices is critical for the environmental sustainability and energy future. So far, majority of efficient lighting devices have been realized by artificial optical materials such as rare‐earth‐elements‐doped phosphors, colloidal quantum dots (QDs) and dyes. In this study, red‐emitting mScarlet and green‐emitting eGFP fluorescent proteins are determined for high‐performance white LEDs, expressed in living Escherichia coli and the purified proteins are integrated in their natural aqueous environment onto blue LED chips. The aqueous integration preserved quantum yield levels of the proteins above 70% in the device architecture and facilitated a high luminous efficiency (LE) of 81 lm W−1 with a color rendering index (CRI) of 83, which is the most efficient eco‐friendly white LED reported to date. Moreover, the concentration ratio are also optimized of red‐ and green‐emitting proteins and white protein‐based LEDs with a maximum CRI of 92 are demonstrated. This study shows that fluorescent proteins hold great promise for the next generation eco‐friendly, efficient and high‐quality white light sources.

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Section: Resultsmentioning

confidence: 99%

Ultra‐Efficient and High‐Quality White Light‐Emitting Devices using Fluorescent Proteins in Aqueous Medium

Sadeghi

Melikov

Conkar

et al. 2020

Adv Materials Technologies

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“…Quantum dots (QDs) are widely used semiconductor nanomaterials because they have excellent optical properties, including high quantum yield, size-controlled fluorescence, narrow emission spectra, strong emission, and low sensitivity to photobleaching. QDs are extensively applied in lighting, solar energy, optical sensing, and biomedical labeling and imaging 1–3. Thus far, mainly group II–VI or IV–VI QDs have been applied, including, for example, CdTe, CdSe, and CdS 4,5.…”

Section: Introductionmentioning

confidence: 99%

<p>InP/ZnS Quantum Dots Cause Inflammatory Response in Macrophages Through Endoplasmic Reticulum Stress and Oxidative stress</p>

Chen¹,

Chen²,

Chen³

et al. 2019

IJN

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PurposeQuantum dots (QDs) are widely used semiconductor nanomaterials. Indium phosphide/zinc sulfide (InP/ZnS) QDs are becoming potential alternatives to toxic heavy metal-containing QDs. However, the potential toxicity and, in particular, the immunotoxicity of InP/ZnS QDs are unknown. This study aimed to investigate the impacts of InP/ZnS QDs on inflammatory responses both in vivo and in vitro.MethodsMice and mouse bone marrow-derived macrophages (BMMs) were exposed to polyethylene glycol (PEG) coated InP/ZnS QDs. The infiltration of neutrophils and the release of interleukin-6 (IL-6) were measured using a hematology analyzer and an enzyme-linked immunosorbent assay (ELISA) for the in vivo test. Cytotoxicity, IL-6 secretion, oxidative stress and endoplasmic reticulum (ER) stress were studied in the BMMs, and then, inhibitors of oxidative stress and ER stress were used to explore the mechanism of the InP/ZnS QDs.ResultsWe found that 20 mg/kg PEG-InP/ZnS QDs increased the number of neutrophils and the levels of IL-6 in both peritoneal lavage fluids and blood, which indicated acute phase inflammation in the mice. PEG-InP/ZnS QDs also activated the BMMs and increased the production of IL-6. In addition, PEG-InP/ZnS QDs triggered oxidative stress and the ER stress-related PERK-ATF4 pathway in the BMMs. Moreover, the inflammatory response caused by the PEG-InP/ZnS QDs could be attenuated in the macrophages by blocking the oxidative stress or the ER stress with inhibitors.ConclusionInP/ZnS QDs can activate macrophages and induce acute phase inflammation both in vivo and in vitro, which may be regulated by oxidative stress and ER stress. Our present work is expected to help clarify the biosafety of InP/ZnS QDs and promote their safe application in biomedical and engineering fields.

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“…As the construction blocks of the graded-gap nanoassembly, we synthesized InP core quantum dots surrounded by a ZnS shell (see the Electronic Supplementary Material (ESM)) for the detailed synthesis procedure). We initially formed InP cores using hot-injection method as we reported previously [16,[28][29][30][31], and potential traps due to surface dangling bonds of the InP core were partially passivated with zinc carboxylate [32]. 0.6 nm ZnS shell [28,30,31] was grown via thermal decomposition of zinc diethyldithiocarbamate to increase the quantum yield and confine the photogenerated excitons inside the core, since higher PLQY leads to more efficient nonradiative energy transfer due to the increase of the Förster radius (see Eqs.…”

Section: Resultsmentioning

confidence: 99%

Exciton recycling via InP quantum dot funnels for luminescent solar concentrators

et al. 2020

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Luminescent solar concentrators (LSC) absorb large-area solar radiation and guide down-converted emission to solar cells for electricity production. Quantum dots (QDs) have been widely engineered at device and quantum dot levels for LSCs. Here, we demonstrate cascaded energy transfer and exciton recycling at nanoassembly level for LSCs. The graded structure composed of different sized toxic-heavy-metal-free InP/ZnS core/shell QDs incorporated on copper doped InP QDs, facilitating exciton routing toward narrow band gap QDs at a high nonradiative energy transfer efficiency of 66%. At the final stage of non-radiative energy transfer, the photogenerated holes make ultrafast electronic transitions to copper-induced mid-gap states for radiative recombination in the near-infrared. The exciton recycling facilitates a photoluminescence quantum yield increase of 34% and 61% in comparison with semi-graded and ungraded energy profiles, respectively. Thanks to the suppressed reabsorption and enhanced photoluminescence quantum yield, the graded LSC achieved an optical quantum efficiency of 22.2%. Hence, engineering at nanoassembly level combined with nonradiative energy transfer and exciton funneling offer promise for efficient solar energy harvesting.

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Structural control of InP/ZnS core/shell quantum dots enables high-quality white LEDs

Cited by 33 publications

References 60 publications

Ultra‐Efficient and High‐Quality White Light‐Emitting Devices using Fluorescent Proteins in Aqueous Medium

Ultra‐Efficient and High‐Quality White Light‐Emitting Devices using Fluorescent Proteins in Aqueous Medium

<p>InP/ZnS Quantum Dots Cause Inflammatory Response in Macrophages Through Endoplasmic Reticulum Stress and Oxidative stress</p>

Exciton recycling via InP quantum dot funnels for luminescent solar concentrators

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