Semiconductor‐Nanocrystals‐Based White Light‐Emitting Diodes

Dai, Qiang; Duty, Chad; Hu, Michael Z.

doi:10.1002/smll.201000144

Cited by 236 publications

(171 citation statements)

References 110 publications

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“…This property has motivated the use of QDs in photovoltaics, lasers, and light emitting diodes. [143][144][145] Optically excited electron-hole pairs in a QD generate a temporary electric dipole moment. 146 It was suggested that the electric field associated with this dipole may be strong enough to generate an action potential in neuronal cells.…”

Section: Qdsmentioning

confidence: 99%

Novel interfaces for light directed neuronal stimulation: advances and challenges

Bareket¹,

Hanein²

2014

IJN

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Light activation of neurons is a growing field with applications ranging from basic investigation of neuronal systems to the development of new therapeutic methods such as artificial retina. Many recent studies currently explore novel methods for optical stimulation with temporal and spatial precision. Novel materials in particular provide an opportunity to enhance contemporary approaches. Here we review recent advances towards light directed interfaces for neuronal stimulation, focusing on state-of-the-art nanoengineered devices. In particular, we highlight challenges and prospects towards improved retinal prostheses.

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Section: Qdsmentioning

confidence: 99%

Novel interfaces for light directed neuronal stimulation: advances and challenges

Bareket¹,

Hanein²

2014

IJN

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“…Driven by the demands for lighting and display with both low power consumption and perfect visual effect, various colloidal nanocrystals (NCs) based white‐light‐emitting diodes (WLEDs) have been explored 1. Compared with traditional metal‐chalcogenide NCs, halide perovskites NCs possess unique characteristics of wide color tunability via postsynthesis anion exchange and good photochemical stability even without shell coating 2.…”

Section: Introductionmentioning

confidence: 99%

Aluminum‐Doped Cesium Lead Bromide Perovskite Nanocrystals with Stable Blue Photoluminescence Used for Display Backlight

et al. 2017

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Bright and stable blue emitters with narrow full‐width at half‐maxima are particularly desirable for applications in television displays and related technologies. Here, this study shows that doping aluminum (Al3+) ion into CsPbBr3 nanocrystals (NCs) using AlBr3 can afford lead‐halide perovskites NCs with stable blue photoluminescence. First, theoretical and experimental analyses reveal that the extended band gap and quantum confinement effect of elongated shape give rise to the desirable blueshifted emission. Second, the aluminum ion incorporation path is rationalized qualitatively by invoking fundamental considerations about binding relations in AlBr3 and its dimer. Finally, the absence of anion‐exchange effect is corroborated when green CsPbBr3 and blue Al:CsPbBr3 NCs are mixed. Combinations of the above two NCs with red‐emitting CdSe@ZnS NCs result in UV‐pumped white light‐emitting diodes (LED) with an National Television System Committee (NTSC) value of 116% and ITU‐R Recommendation B.T. 2020 (Rec. 2020) of 87%. The color coordinates of the white LED are optimized at (0.32, 0.34) in CIE 1931. The results suggest that low‐cost, earth‐abundant, solution‐processable Al‐doped perovskite NCs can be promising candidate materials for blue down‐conversion layer in backlit displays.

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“…As the next generation color converters, scattering--free/scattering-less colloidal semiconductor nanocrystals (NCs) have higher luminescence efficiency, larger molar absorptivity and color tunability in comparison with traditional phosphors [9][10][11][12], which have been proven as promising color converters for WLEDs [13][14][15]. Various NCs such as ZnCdS [16][17][18][19][20][21], CdSe [22][23][24][25][26], ZnCdSe [27], CuInS [28][29][30][31][32][33][34][35], and InP [36][37][38][39][40][41] NCs have been successfully applied in the fabrication of WLEDs to enhance the color properties of the device.…”

Section: Introductionmentioning

confidence: 99%

Large-scale synthesis of single-source, thermally stable, and dual-emissive Mn-doped Zn–Cu–In–S nanocrystals for bright white light-emitting diodes

Peng

Zhang

et al. 2015

Nano Res.

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Non-cadmium" dual emissive QDs have been directly synthesized using a one-pot hot-injection technique. A white LED was successfully fabricated using a commercial blue-LED chip combined with the optimal QDs. ABSTRACTThe global demand for resource sustainability is growing. Thus, the development of single-source environment-friendly colloidal semiconductor nanocrystal (NC) phosphors with broadband emission is highly desirable for use as color converters in white light-emitting diodes (WLEDs). We report herein the gram-scale synthesis of single-source, cadmium-free, dual-emissive Mn-doped Zn-Cu-In-S NCs (d-dots) by a simple, non-injection, and low-cost approach in one-pot fashion. This synthesis approach led to the formation of NCs with continuously varying compositions in a radial direction because the reactivity of precursors totally differed among these precursors. Consequently, d-dots exhibited two emission bands, one of which was due to Mn-related emissions and the other was due to the band edge of Zn-Cu-In-S NCs. Emission peaks assigned to band edge were tunable by simple control of particle size and composition. The prepared d-dots also exhibited the characteristic zero self-absorption, a quantum yield of 46%, and good thermal stability. A combination of a commercial blue LED chip with optimal d-dots as color converters gave a high color rending index of up to 90, Commission International de l'Eclairage color coordinates of (0.332, 0.321), and correlated color temperature of 5680 K. These results suggested that this cadmium-free, excellent thermally stable single-phase d-dot phosphor had potential applications in WLEDs. Nano Research DOI () Research Article| www.editorialmanager.com/nare/default.asp 2 Nano Res.

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Semiconductor‐Nanocrystals‐Based White Light‐Emitting Diodes

Cited by 236 publications

References 110 publications

Novel interfaces for light directed neuronal stimulation: advances and challenges

Novel interfaces for light directed neuronal stimulation: advances and challenges

Aluminum‐Doped Cesium Lead Bromide Perovskite Nanocrystals with Stable Blue Photoluminescence Used for Display Backlight

Large-scale synthesis of single-source, thermally stable, and dual-emissive Mn-doped Zn–Cu–In–S nanocrystals for bright white light-emitting diodes

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