Journal ArticleDOI
Highly Efficient Cadmium-Free Quantum Dot Light-Emitting Diodes Enabled by the Direct Formation of Excitons within InP@ZnSeS Quantum Dots
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TLDR
Bright, efficient, and environmentally benign InP quantum dot (QD)-based light-emitting diodes (QLEDs) are demonstrated through the direct charge carrier injection into QDs and the efficient radiative exciton recombination within QDs through a comprehensive scheme in designing device architecture and structural formulation of QDs.Abstract:
We demonstrate bright, efficient, and environmentally benign InP quantum dot (QD)-based light-emitting diodes (QLEDs) through the direct charge carrier injection into QDs and the efficient radiative exciton recombination within QDs. The direct exciton formation within QDs is facilitated by an adoption of a solution-processed, thin conjugated polyelectrolyte layer, which reduces the electron injection barrier between cathode and QDs via vacuum level shift and promotes the charge carrier balance within QDs. The efficient radiative recombination of these excitons is enabled in structurally engineered InP@ZnSeS heterostructured QDs, in which excitons in the InP domain are effectively passivated by thick ZnSeS composition-gradient shells. The resulting QLEDs record 3.46% of external quantum efficiency and 3900 cd m–2 of maximum brightness, which represent 10-fold increase in device efficiency and 5-fold increase in brightness compared with previous reports. We believe that such a comprehensive scheme in design...read more
Citations
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Journal ArticleDOI
Quantum Dot Light-Emitting Diodes Based on Inorganic Perovskite Cesium Lead Halides (CsPbX3)
TL;DR: The demonstration of these novel quantum-dot light-emitting diodes based on all-inorganic perovskite CsPbX3 (X = Cl, Br, I) nanocrystals opens a new avenue toward designing optoelectronic devices, such as displays, photodetectors, solar cells, and lasers.
Journal ArticleDOI
Spectroscopic and Device Aspects of Nanocrystal Quantum Dots
Jeffrey M. Pietryga,Young-Shin Park,Young-Shin Park,Jaehoon Lim,Andrew F. Fidler,Wan Ki Bae,Sergio Brovelli,Victor I. Klimov +7 more
TL;DR: Recent advances in nanocrystal research related to applications of QD materials in lasing, light-emitting diodes (LEDs), and solar energy conversion are examined.
Journal ArticleDOI
Highly efficient and stable InP/ZnSe/ZnS quantum dot light-emitting diodes
Yu-Ho Won,Cho Oul,Kim Tae Hyung,Dae-Young Chung,Taehee Kim,Heejae Chung,Hyosook Jang,Jun-Ho Lee,Dongho Kim,Eunjoo Jang +9 more
TL;DR: A method of engineering efficient and stable InP/ZnSe/ ZnS quantum dot light-emitting diodes (QD-LEDs) has improved their performance to the level of state-of-the-art cadmium-containing QD- LEDs, removing the problem of the toxicity of cadMium in large-panel displays.
Journal ArticleDOI
Engineering triangular carbon quantum dots with unprecedented narrow bandwidth emission for multicolored LEDs
Fanglong Yuan,Ting Yuan,Laizhi Sui,Laizhi Sui,Zhibin Wang,Zifan Xi,Yunchao Li,Xiaohong Li,Louzhen Fan,Zhan'ao Tan,Zhan'ao Tan,Anmin Chen,Mingxing Jin,Shihe Yang +13 more
TL;DR: This work demonstrates multicolored narrow bandwidth emission from triangular CQDs with a quantum yield up to 54–72% and synthesizes these dots showing tunable emission color, high fluorescence and a narrow FWHM of only 30 nanometers, which will set the stage for developing next-generation high-performance C QDs-based light-emitting diodes.
Journal ArticleDOI
Quantum-Dot Light-Emitting Diodes for Large-Area Displays: Towards the Dawn of Commercialization.
TL;DR: A Progress Report, covering interdisciplinary aspects including material chemistry of quantum dots and charge-transporting layers, optimization and mechanism studies of prototype devices and processing techniques to produce large-area and high-resolution red-green-blue pixel arrays, identifies a few key challenges facing the development of active-matrix QLED displays.
References
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Journal ArticleDOI
Inkjet Printing—Process and Its Applications
TL;DR: This Progress Report provides an update on recent developments in inkjet printing technology and its applications, which include organic thin-film transistors, light-emitting diodes, solar cells, conductive structures, memory devices, sensors, and biological/pharmaceutical tasks.
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Journal ArticleDOI
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Victor I. Klimov,Alexander Mikhailovsky,Duncan W. McBranch,C. A. Leatherdale,Moungi G. Bawendi +4 more
TL;DR: It is observed that in the quantum-confined regime, the Auger constant is strongly size-dependent and decreases with decreasing the quantum dot size as the radius cubed.
Journal ArticleDOI
High-efficiency quantum-dot light-emitting devices with enhanced charge injection
Benjamin S. Mashford,Matthew Stevenson,Zoran B. Popović,Charles W. Hamilton,Zhaoqun Zhou,Craig Breen,Jonathan S. Steckel,Vladimir Bulovic,Moungi G. Bawendi,Seth Coe-Sullivan,Peter T. Kazlas +10 more
TL;DR: In this paper, a red quantum-dot light-emitting diodes with an external quantum efficiency of 18, close to the theoretical maximum of 20%, were reported, using a layer of zinc oxide nanocrystals providing highly effective electron transport.