Journal ArticleDOI
Bright, multicoloured light-emitting diodes based on quantum dots
Qingjiang Sun,Y. Andrew Wang,Lin Song Li,Daoyuan Wang,Ting Zhu,Jian Xu,Chunhe Yang,Yongfang Li +7 more
TLDR
In this paper, a solution-processable core-shell quantum dots with a CdSe core and a ZnS or CdS/ZnS shell were used as emissive layers in the devices.Abstract:
Quantum-dot-based LEDs are characterized by pure and saturated emission colours with narrow bandwidth, and their emission wavelength is easily tuned by changing the size of the quantum dots. However, the brightness, efficiency and lifetime of LEDs need to be improved to meet the requirements of commercialization in the near future. Here, we report red, orange, yellow and green LEDs with maximum luminance values of 9,064, 3,200, 4,470 and 3,700 cd m−2, respectively, the highest values reported so far. Solution-processable core–shell quantum dots with a CdSe core and a ZnS or CdS/ZnS shell were used as emissive layers in the devices. By optimizing the thicknesses of the constituent layers of the devices, we were able to develop quantum-dot-based LEDs with improved electroluminescent efficiency (1.1–2.8 cd A−1), low turn-on voltages (3–4 V) and long operation lifetimes. These findings suggest that such quantum-dot-based LEDs will be promising for use in flat-panel displays.read more
Citations
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Journal ArticleDOI
Prospects of Colloidal Nanocrystals for Electronic and Optoelectronic Applications
TL;DR: Nanocrystals (NCs) discussed in this Review are tiny crystals of metals, semiconductors, and magnetic material consisting of hundreds to a few thousand atoms each that are among the hottest research topics of the last decades.
Journal ArticleDOI
Emergence of colloidal quantum-dot light-emitting technologies
TL;DR: In this paper, the authors summarized the key advantages of using quantum dots as luminophores in light-emitting devices (LEDs) and outlined the operating mechanisms of four types of QD-LEDs.
Journal ArticleDOI
Brightly Luminescent and Color-Tunable Colloidal CH3NH3PbX3 (X = Br, I, Cl) Quantum Dots: Potential Alternatives for Display Technology.
Feng Zhang,Haizheng Zhong,Cheng Chen,Xian-gang Wu,Xiangmin Hu,Huang Hailong,Junbo Han,Bingsuo Zou,Yuping Dong +8 more
TL;DR: A ligand-assisted reprecipitation strategy is developed to fabricate brightly luminescent and color-tunable colloidal CH3NH3PbX3 quantum dots with absolute quantum yield up to 70% at room temperature and low excitation fluencies, expected to exhibit interesting nanoscale excitonic properties.
Journal ArticleDOI
Carbon and Graphene Quantum Dots for Optoelectronic and Energy Devices: A Review
TL;DR: In this article, recent exciting progresses on CD and GQD-based optoelectronic and energy devices, such as light emitting diodes (LEDs), solar cells (SCs), photodetctors (PDs), photocatalysis, batteries, and supercapacitors are highlighted.
Journal ArticleDOI
Full-colour quantum dot displays fabricated by transfer printing
Tae-Ho Kim,Kyung Sang Cho,Eun-Kyung Lee,Sang-Jin Lee,Jungseok Chae,Jung Woo Kim,Do Hwan Kim,Jang Yeon Kwon,Gehan A. J. Amaratunga,Sang Yoon Lee,Byoung Lyong Choi,Young Kuk,Jong Min Kim,Kinam Kim +13 more
TL;DR: In this paper, a size-selective quantum dot patterning technique that involves kinetically controlling the nanotransfer process without a solvent is described, which allows fabrication of a 4-inch (or larger) thin-film transistor display with high colour purity and extremely high resolution.
References
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Journal ArticleDOI
Organic Electroluminescent Diodes
Ching Wan Tang,Steven A Vanslyke +1 more
TL;DR: In this article, a double-layer structure of organic thin films was prepared by vapor deposition, and efficient injection of holes and electrons was provided from an indium-tinoxide anode and an alloyed Mg:Ag cathode.
Journal ArticleDOI
Experimental Determination of the Extinction Coefficient of CdTe, CdSe, and CdS Nanocrystals
TL;DR: In this article, the extinction coefficient per mole of nanocrystals at the first exitonic absorption peak, e.g., for high-quality CdTe, CdSe, and CdS, was found to be strongly dependent on the size of the nanocrystal, between a square and a cubic dependence.
Journal ArticleDOI
Synthesis and Characterization of Monodisperse Nanocrystals and Close-Packed Nanocrystal Assemblies
TL;DR: In this article, solution phase syntheses and size-selective separation methods to prepare semiconductor and metal nanocrystals, tunable in size from ∼1 to 20 nm and monodisperse to ≤ 5%, are presented.
Journal ArticleDOI
Light-emitting diodes made from cadmium selenide nanocrystals and a semiconducting polymer
TL;DR: In this article, a hybrid organic/inorganic electroluminescent device was constructed based on the recombination of holes injected into a layer of semiconducting p-paraphenylene vinylene (PPV) with electrons injected into the multilayer film of cadmium selenide nanocrystals.
Journal Article
Light-emitting diodes made from cadmium selenide nanocrystals and a semiconducting polymer
TL;DR: In this article, a hybrid organic/inorganic electroluminescent device was constructed based on the recombination of holes injected into a layer of semiconducting p-paraphenylene vinylene (PPV) with electrons injected into the multilayer film of cadmium selenide nanocrystals.