A Wafer‐Level Integrated White‐Light‐Emitting Diode Incorporating Colloidal Quantum Dots as a Nanocomposite Luminescent Material

Dang, Cuong; Lee, Joonhee; Han, Jung; Breen, Craig; Steckel, Jonathan S.; Coe‐Sullivan, Seth; Nurmikko, A. V.

doi:10.1002/adma.201202354

Cited by 35 publications

(31 citation statements)

References 17 publications

(22 reference statements)

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“…As a matter of fact, nanocomposites have been claimed to be responsible for the longer durability of electrocatalysts in rechargeable batteries, 1,2 for the improved extraction of photogenerated current in depleted heterojunction quantum dot-based solar cells, 3,4 for the enhanced light-extraction efficiency and color tunability in quantum dot-based light emitting diodes, 5 and for the higher electrical conductivity, lower thermal conductivity and enhanced Seebeck coefficient in thermoelectric devices, to mention a few examples. [6][7][8][9][10][11][12][13] One way to fabricate such functional nanocomposites is by exploiting the bottom-up assembly of pre-made tailored nanoparticles (NPs).…”

Section: Introductionmentioning

confidence: 99%

Synthesis and Thermoelectric Properties of Noble Metal Ternary Chalcogenide Systems of Ag–Au–Se in the Forms of Alloyed Nanoparticles and Colloidal Nanoheterostructures

Dalmases¹,

Ibáñez

Torruella³

et al. 2016

Chem. Mater.

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ABSTRACT:The optimization of a material functionality requires both the rational design and precise engineering of its structural and chemical parameters. In this work, we show how colloidal chemistry is an excellent synthetic choice for the synthesis of novel ternary nanostructured chalcogenides, containing exclusively noble metals, with tailored morphology and composition and with potential application in the energy conversion field. Specifically, the Ag-Au-Se system has been explored from a synthetic point of view, leading to a set of Ag 2 Se-based hybrid and ternary nanoparticles, including the room temperature synthesis of the rare ternary Ag 3 AuSe 2 fischesserite phase. An in-depth structural and chemical characterization of all nanomaterials has been performed, which proofed especially useful for unravelling the reaction mechanism behind the formation of the ternary phase in solution. The work is complemented with the thermal and electric characterization of a ternary Ag-Au-Se nanocomposite with promising results: we found that the use of the ternary nanocomposite represents a clear improvement in terms of thermoelectric energy conversion as compared to a binary Ag-Se nanocomposite analogue.

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Section: Introductionmentioning

confidence: 99%

Synthesis and Thermoelectric Properties of Noble Metal Ternary Chalcogenide Systems of Ag–Au–Se in the Forms of Alloyed Nanoparticles and Colloidal Nanoheterostructures

Dalmases¹,

Ibáñez

Torruella³

et al. 2016

Chem. Mater.

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“…Therefore, increasing the amount of outcoupled light is very essential to realize high-efficiency light sources. This problem has been addressed for different types of LEDs including organic LEDs [30][31][32] and epitaxially grown LEDs [52][53][54][55] in addition to LEDs using QDs for color conversion [32,56] and charge injection [57][58][59]. These works in general make use of scattering structures that alter the exiting angle of the light beam leaving the device and indirectly overcomes the angular limitation imposed on the planar structures by Snell's law.…”

Section: Color-converting Colloidal Materials For Lightingmentioning

confidence: 99%

“…It was shown that patterning the GaN/InGaN surface to define a photonic crystal improves the light extraction of the QD film by 40% and also significantly increases the light intensity at off-axis. Alternatively, Dang et al prepared a nanoporous GaN layer by electrochemical etching [32]. Random texturing of the epitaxial layer was shown to improve the light-extraction efficiency and also constructed an appropriate host for the integration of QDs ( Fig.…”

Section: Color-converting Colloidal Materials For Lightingmentioning

confidence: 99%

Colloidal nanocrystals for quality lighting and displays: milestones and recent developments

Erdem

Demir

2016

Nanophotonics

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Recent advances in colloidal synthesis of nanocrystals have enabled high-quality high-efficiency light-emitting diodes, displays with significantly broader color gamut, and optically-pumped lasers spanning the whole visible regime. Here we review these colloidal platforms covering the milestone studies together with recent developments. In the review, we focus on the devices made of colloidal quantum dots (nanocrystals), colloidal quantum rods (nanorods), and colloidal quantum wells (nanoplatelets) as well as those of solution processed perovskites and phosphor nanocrystals. The review starts with an introduction to colloidal nanocrystal photonics emphasizing the importance of colloidal materials for light-emitting devices. Subsequently, we continue with the summary of important reports on light-emitting diodes, in which colloids are used as the color converters and then as the emissive layers in electroluminescent devices. Also, we review the developments in color enrichment and electroluminescent displays. Next, we present a summary of important reports on the lasing of colloidal semiconductors. Finally, we summarize and conclude the review presenting a future outlook.

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“…Nowadays, combined with ultraviolet light, high efficiency white light emission has been realized by RGBQDs [9,10]. However, most of these white LEDs based on the QDs have low LEE resulting from scattering problem [11]. Therefore, it is still a challenge to fabricate QDs white LEDs with high LEE along with their high luminescent performance.…”

Section: Introductionmentioning

confidence: 99%

Using Three-Component Hierarchical Structures to Improve the Light Extraction From White Leds Based on Red-Green-Blue Color Mixing Method

Li¹,

Li²,

Kong³

et al. 2017

PIER C

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Abstract-In this work, we present a three-component hierarchical structure to simultaneously improve the red, green, and blue (RGB) light extraction efficiency (LEE) of white light-emitting diodes (LEDs) based on color mixing method. With the help of 3D finite-difference time-domain (FDTD) simulations, the effects of the embedded photonic crystals (PhCs) the normal surface PhCs and the nano-rods on the enhancement of RGB light extraction were investigated. The results were compared with those of the conventional planar LEDs and the normal surface PhCs LEDs over the whole visible spectrum. Results from the simulations demonstrated that the maximum LEE for the hierarchical structures LEDs gave 112%, 327%, and 284% RGB LEE enhancement, respectively, compared to that of the conventional planar LEDs, and achieved 104%, 191%, and 187% RGB LEE enhancement compared to that of LEDs with normal surface PhCs. The emission characteristics of the hierarchical structures LEDs were also revealed in detail by FDTD simulations. The results shown in this paper would do a favor for the design and fabrication of high efficiency LEDs.

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A Wafer‐Level Integrated White‐Light‐Emitting Diode Incorporating Colloidal Quantum Dots as a Nanocomposite Luminescent Material

Cited by 35 publications

References 17 publications

Synthesis and Thermoelectric Properties of Noble Metal Ternary Chalcogenide Systems of Ag–Au–Se in the Forms of Alloyed Nanoparticles and Colloidal Nanoheterostructures

Synthesis and Thermoelectric Properties of Noble Metal Ternary Chalcogenide Systems of Ag–Au–Se in the Forms of Alloyed Nanoparticles and Colloidal Nanoheterostructures

Colloidal nanocrystals for quality lighting and displays: milestones and recent developments

Using Three-Component Hierarchical Structures to Improve the Light Extraction From White Leds Based on Red-Green-Blue Color Mixing Method

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