Electroluminescence from band-edge-emitting AgInS2/GaSx core/shell quantum dots

2020 ◽  
Vol 117 (9) ◽  
pp. 091101
Author(s):  
Genichi Motomura ◽  
Kei Ogura ◽  
Yukiko Iwasaki ◽  
Taro Uematsu ◽  
Susumu Kuwabata ◽  
...  
Keyword(s):  
Quantum Dots ◽  
Band Edge ◽  
Core Shell

scholarly journals [Paper] Green Electroluminescence Generated by Band-edge Transition in Ag-In-Ga-S/GaSx Core/shell Quantum Dots

2021 ◽  
Vol 9 (4) ◽  
pp. 222-227
Author(s):  
Genichi Motomura ◽  
Yukiko Iwasaki ◽  
Tatsuya Kameyama ◽  
Tsukasa Torimoto ◽  
Taro Uematsu ◽  
...  
Keyword(s):  
Quantum Dots ◽  
Band Edge ◽  
Core Shell ◽  
Band Edge Transition

Photoinduced electron transfer from quantum dots to TiO2: elucidating the involvement of excitonic and surface states

2016 ◽  
Vol 18 (30) ◽  
pp. 20466-20475 ◽  
Author(s):  
Saurabh Chauhan ◽  
David F. Watson
Keyword(s):  
Quantum Dots ◽  
Electron Transfer ◽  
Photoinduced Electron Transfer ◽  
Surface States ◽  
Band Edge ◽  
Core Shell ◽  
Edge States ◽  
Cdse Qds

CdSe QDs transfer electrons from band-edge and surface states to TiO2; core/shell CdSe/ZnS QDs transfer electrons exclusively from band-edge states.

scholarly journals The Different Nature of Band Edge Absorption and Emission in Colloidal PbSe/CdSe Core/Shell Quantum Dots

ACS Nano ◽  
2010 ◽  
Vol 5 (1) ◽  
pp. 58-66 ◽  
Author(s):  
Bram De Geyter ◽  
Yolanda Justo ◽  
Iwan Moreels ◽  
Karel Lambert ◽  
Philippe F. Smet ◽  
...  
Keyword(s):  
Quantum Dots ◽  
Band Edge ◽  
Core Shell ◽  
Cdse Core ◽  
Absorption And Emission ◽  
Edge Absorption

(Keynote) Band-Edge Emission from AgInS2/Ga2S3 Core/Shell Quantum Dots and Enhancement of Their Quantum Yield

2020 ◽  
Vol MA2020-02 (61) ◽  
pp. 3076-3076
Author(s):  
Susumu Kuwabata ◽  
Taro Uematsu ◽  
Watcharaporn Hoisang ◽  
Tsukasa Torimoto
Keyword(s):  
Quantum Dots ◽  
Quantum Yield ◽  
Band Edge ◽  
Core Shell ◽  
Band Edge Emission ◽  
Edge Emission

Green Electroluminescence Generated by Band-edge Transition in Ag–In–Ga–S/GaSx Core/shell Quantum Dots

2020 ◽  
pp. 377
Author(s):  
Genichi Motomura ◽  
Yukiko Iwasaki ◽  
Tatsuya Kameyama ◽  
Tsukasa Torimoto ◽  
Taro Uematsu ◽  
...  
Keyword(s):  
Quantum Dots ◽  
Band Edge ◽  
Core Shell ◽  
Band Edge Transition

Near-band-edge emission characteristics of ZnO-MgO core-shell quantum-dots

2016 ◽  
Vol 178 ◽  
pp. 27-30 ◽  
Author(s):  
Wen-Jian Kuang ◽  
Qing Li ◽  
Yi Sun ◽  
Jing Chen ◽  
Harm Tolner
Keyword(s):  
Quantum Dots ◽  
Band Edge ◽  
Near Band Edge Emission ◽  
Near Band Edge ◽  
Core Shell ◽  
Band Edge Emission ◽  
Emission Characteristics ◽  
Edge Emission

High-Temperature Synthesis of CdSe-Based Core/Shell, Core/Shell/Shell, and Core/Graded-Shell Nanoplatelets for Stable and Efficient Narrowband Emitters

2019 ◽  
Author(s):  
Aurelio A. Rossinelli ◽  
Henar Rojo ◽  
Aniket S. Mule ◽  
Marianne Aellen ◽  
Ario Cocina ◽  
...  
Keyword(s):  
Quantum Dots ◽  
High Temperature ◽  
Equilibrium Shape ◽  
Size Variation ◽  
Crystal Defects ◽  
Atomic Scale ◽  
Quantum Yields ◽  
Core Shell ◽  
Compositional Gradient ◽  
High Quality

<div>Colloidal semiconductor nanoplatelets exhibit exceptionally narrow photoluminescence spectra. This occurs because samples can be synthesized in which all nanoplatelets share the same atomic-scale thickness. As this dimension sets the emission wavelength, inhomogeneous linewidth broadening due to size variation, which is always present in samples of quasi-spherical nanocrystals (quantum dots), is essentially eliminated. Nanoplatelets thus offer improved, spectrally pure emitters for various applications. Unfortunately, due to their non-equilibrium shape, nanoplatelets also suffer from low photo-, chemical, and thermal stability, which limits their use. Moreover, their poor stability hampers the development of efficient synthesis protocols for adding high-quality protective inorganic shells, which are well known to improve the performance of quantum dots. <br></div><div>Herein, we report a general synthesis approach to highly emissive and stable core/shell nanoplatelets with various shell compositions, including CdSe/ZnS, CdSe/CdS/ZnS, CdSe/Cd<sub>x</sub>Zn<sub>1–x</sub>S, and CdSe/ZnSe. Motivated by previous work on quantum dots, we find that slow, high-temperature growth of shells containing a compositional gradient reduces strain-induced crystal defects and minimizes the emission linewidth while maintaining good surface passivation and nanocrystal uniformity. Indeed, our best core/shell nanoplatelets (CdSe/Cd<sub>x</sub>Zn<sub>1–x</sub>S) show photoluminescence quantum yields of 90% with linewidths as low as 56 meV (19.5 nm at 655 nm). To confirm the high quality of our different core/shell nanoplatelets for a specific application, we demonstrate their use as gain media in low-threshold ring lasers. More generally, the ability of our synthesis protocol to engineer high-quality shells can help further improve nanoplatelets for optoelectronic devices.</div>

Enhanced Photocurrent Generation in Proton‐Irradiated “Giant” CdSe/CdS Core/Shell Quantum Dots

2019 ◽  
Vol 29 (46) ◽  
pp. 1904501 ◽  
Author(s):  
Chao Wang ◽  
David Barba ◽  
Gurpreet S. Selopal ◽  
Haiguang Zhao ◽  
Jiabin Liu ◽  
...  
Keyword(s):  
Quantum Dots ◽  
Core Shell ◽  
Photocurrent Generation
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