Highly Bright Yellow-Green-Emitting CuInS<sub>2</sub> Colloidal Quantum Dots with Core/Shell/Shell Architecture for White Light-Emitting Diodes

Park, Sang Hyun; Hong, A-Ra; Kim, Jong Hoon; Yang, Heesun; Lee, Kwangyeol; Jang, Ho Seong

doi:10.1021/acsami.5b00166

Cited by 116 publications

(95 citation statements)

References 47 publications

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“…To increase CRI, we can mix red (R) phosphor with green (G) phosphor, but green phosphor exhibits low efficiency and entails high costs for this RG phosphor with a blue chip . RG QDs have been commonly used in LED because their emission wavelengths can be simply tuned to increase luminescence and its CRI. QDs are optimum backlight materials because of their narrow emission wavelength and superior color purity.…”

Section: Methodsmentioning

confidence: 99%

Mesoporous Silica Particles Integrated with All‐Inorganic CsPbBr₃ Perovskite Quantum‐Dot Nanocomposites (MP‐PQDs) with High Stability and Wide Color Gamut Used for Backlight Display

et al. 2016

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All‐inorganic CsPbX3 (X=I, Br, Cl) perovskite quantum dots (PQDs) have been investigated because of their optical properties, such as tunable wavelength, narrow band, and high quantum efficiency. These features have been used in light emitting diode (LED) devices. LED on‐chip fabrication uses mixed green and red quantum dots with silicone gel. However, the ion‐exchange effect widens the narrow emission spectrum. Quantum dots cannot be mixed because of anion exchange. We address this issue with a mesoporous PQD nanocomposite that can prevent ion exchange and increase stability. We mixed green quantum‐dot‐containing mesoporous silica nanocomposites with red PQDs, which can prevent the anion‐exchange effect and increase thermal and photo stability. We applied the new PQD‐based LEDs for backlight displays. We also used PQDs in an on‐chip LED device. Our white LED device for backlight display passed through a color filter with an NTSC value of 113 % and Rec. 2020 of 85 %.

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Section: Methodsmentioning

confidence: 99%

Mesoporous Silica Particles Integrated with All‐Inorganic CsPbBr₃ Perovskite Quantum‐Dot Nanocomposites (MP‐PQDs) with High Stability and Wide Color Gamut Used for Backlight Display

et al. 2016

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“…Amongst ternary chalcogenide materials, group I‐III‐VI (CuInS 2 , CuInSe 2 , AgInSe 2 , CuInTe 2 etc.) and I−V‐VI (CuSbS 2 , CuSbSe 2 , AgSbSe 2 , CuBiSe 2 , etc) semiconductor NCs are well known for their effective use in photovoltaics and optoelectronic fields . The unique properties such as high absorption coefficient (>10 4 cm −1 ), ideal band gap (1‐1.5 eV), high photoelectric corrosion efficiency, photo‐irradiation stability and low toxicity make such materials technologically valuable .…”

Section: Introductionmentioning

confidence: 99%

Reaction Tailoring for Synthesis of Phase‐Pure Nanocrystals of AgInSe₂, Cu₃SbSe₃ and CuSbSe₂

Kshirsagar

Khanna

2018

ChemistrySelect

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Present article highlights synthesis of phase pure I, III, VI2 and I, V, VI2 ternary selenides nanocrystals (NCs) using oleic acid and oleyl amine capping agents. The synthesis of AgInSe2 (AISe), Cu3SbSe3 and CuSbSe2 (CSSe) NCs was executed by employing cyclohexeno‐1,2,3‐selenadiazole (SDZ) as Se precursor. The current study is the first report describing use of thermally labile organoselenium compound for the synthesis of such technologically important ternary selenide NCs. Systematic study of the formation of AISe and CSSe NCs at different reaction time is carried out in order to confirm phase purity and stoichiometry. The spherical, stoichiometric and NIR active semiconductors showed formation of orthorhombic crystal structure as confirmed from XRD analysis. It was observed that formation of phase pure AISe NCs requires 5 hours (h) of constant heating at about 220οC irrespective of the capping agents however, CuSbSe2 was obtained within an hour in presence of oleyl amine at same reaction temperature. Nanocrystals were characterized by different analytical tools such as UV‐Visible spectroscopy, FTIR, XRD, SEM/EDS, TEM, particle size and XPS analysis. Based on the results, possible chemical reaction pathway for ternary chalcogenide is presented.

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“…As a typical example, effective heat dissipation from a white light‐emitting plate by use of a graphene coating helped the WLED to achieve long‐term reliability in emission color characteristics even at high power operating conditions . Packaging of QDs for fabricating WLED color converters can be made in solid and liquid phases . QDs can be more readily dispersed in a liquid, rather than a solid, matrix .…”

Section: Optical Properties Of Cdzns/zns Cdznses/zns and Cdse/cds/zmentioning

confidence: 99%

Highly Luminescent Quantum Dots in Remote‐Type Liquid‐Phase Color Converters for White Light‐Emitting Diodes

Choi

Han

et al. 2018

Adv Materials Technologies

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QDs. [14][15][16][17] However, they have less than optimal optical properties due to nonradiative recombination by defects. [12,18] As a result, despite the safety issues, Cdbased QDs are still attracting much attention and are seen as promising candidate materials for versatile applications in nonbiological environments owing to their outstanding performance with respect to tunable luminescence across the ultraviolet-visible-near-infrared (UV-vis-NIR) region, broad absorption bands with narrow emission bands, high quantum yields, [19] chemical stability, and photostability. [20,21] It is important to note that QDs have been passivated with higher bandgap semiconductor layers, such as ZnS and CdS, to increase the quantum yield. In the core-shell type QDs, the shell provides physical and chemical stabilities, as well as photostability to the core QDs, which is important for minimizing cytotoxicity, and also offers platforms for ligand exchange and further functionalization. [22] White light-emitting diodes (WLEDs) are commonly fabricated by combining inorganic phosphors with a blue or UV LED. [23,24] However, it is not easy to achieve a tailored and fullspectrum white light with currently available phosphors. The light spectra emitted by phosphor-based WLEDs are tuned by adjusting weight ratios of phosphors with different emission wavelengths. QDs behave like phosphors but their emissive colors are controlled by varying the size and composition. QDs have emerged as a good alternative to the phosphors in LEDs. Quantum dots (QDs) can be integrated into a solid-phase color converter (SCC) for white light-emitting diodes (WLEDs). However, the development of QD-based SCCs is prevented by the limitations of the QDs themselves, nonuniform dispersion or aggregation of the QDs, and heat accumulation by low thermal conductivity of the solid matrix. Herein, the development of new high-quality CdZnSeS/ZnS QDs in a one spot synthesis is reported that have high photoluminescence quantum yield (up to 100% for green wavelengths), narrow emission spectra (full width at half maximum< 27.3 nm), and good color tunability in the green region, 496-586 nm. Seven different color QDs are used to fabricate liquid-phase color converters (LCCs) for application in WLEDs with a remote configuration. The best LCC-based WLEDs show not only intense bright day white light (correlated color temperature = 6029 K) with a maximum luminous efficacy of 222.7 lm W −1 , but also excellent color quality (color rendering index = 95.1, as well as R9 = 94.4, and R13 = 97.1), which is very important in medical diagnostic lighting, dressing and display room lighting, painting and accent lighting. These results indicate remarkable progress both in the synthesis of high-quality QDs and in the development of WLEDs for high-performance commercial lighting devices.The ORCID identification number(s) for the author(s) of this article can be found under https://doi.org/10.1002/admt.201800235.Semiconductor nanocrystals, namely quantum dots (QDs) have created many innova...

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Highly Bright Yellow-Green-Emitting CuInS₂ Colloidal Quantum Dots with Core/Shell/Shell Architecture for White Light-Emitting Diodes

Cited by 116 publications

References 47 publications

Mesoporous Silica Particles Integrated with All‐Inorganic CsPbBr₃ Perovskite Quantum‐Dot Nanocomposites (MP‐PQDs) with High Stability and Wide Color Gamut Used for Backlight Display

Mesoporous Silica Particles Integrated with All‐Inorganic CsPbBr₃ Perovskite Quantum‐Dot Nanocomposites (MP‐PQDs) with High Stability and Wide Color Gamut Used for Backlight Display

Reaction Tailoring for Synthesis of Phase‐Pure Nanocrystals of AgInSe₂, Cu₃SbSe₃ and CuSbSe₂

Highly Luminescent Quantum Dots in Remote‐Type Liquid‐Phase Color Converters for White Light‐Emitting Diodes

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Highly Bright Yellow-Green-Emitting CuInS2 Colloidal Quantum Dots with Core/Shell/Shell Architecture for White Light-Emitting Diodes

Cited by 116 publications

References 47 publications

Mesoporous Silica Particles Integrated with All‐Inorganic CsPbBr3 Perovskite Quantum‐Dot Nanocomposites (MP‐PQDs) with High Stability and Wide Color Gamut Used for Backlight Display

Mesoporous Silica Particles Integrated with All‐Inorganic CsPbBr3 Perovskite Quantum‐Dot Nanocomposites (MP‐PQDs) with High Stability and Wide Color Gamut Used for Backlight Display

Reaction Tailoring for Synthesis of Phase‐Pure Nanocrystals of AgInSe2, Cu3SbSe3 and CuSbSe2

Highly Luminescent Quantum Dots in Remote‐Type Liquid‐Phase Color Converters for White Light‐Emitting Diodes

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Product

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Highly Bright Yellow-Green-Emitting CuInS₂ Colloidal Quantum Dots with Core/Shell/Shell Architecture for White Light-Emitting Diodes

Mesoporous Silica Particles Integrated with All‐Inorganic CsPbBr₃ Perovskite Quantum‐Dot Nanocomposites (MP‐PQDs) with High Stability and Wide Color Gamut Used for Backlight Display

Mesoporous Silica Particles Integrated with All‐Inorganic CsPbBr₃ Perovskite Quantum‐Dot Nanocomposites (MP‐PQDs) with High Stability and Wide Color Gamut Used for Backlight Display

Reaction Tailoring for Synthesis of Phase‐Pure Nanocrystals of AgInSe₂, Cu₃SbSe₃ and CuSbSe₂