Quaternary Alloy Quantum Dots: Toward Low‐Threshold Stimulated Emission and All‐Solution‐Processed Lasers in the Green Region

Wang, Yue; Yang, Shancheng; Yang, Heesun; Sun, Handong

doi:10.1002/adom.201400528

Cited by 36 publications

(28 citation statements)

References 38 publications

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“…The ASE threshold of 2 μJ cm 2 (with 100 fs pulses, Figure 3 b) is one of the lowest values reported for solution-processed NC films. 14 , 38 − 41 …”

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confidence: 99%

Colloidal CsPbX₃ (X = Cl, Br, I) Nanocrystals 2.0: Zwitterionic Capping Ligands for Improved Durability and Stability

et al. 2018

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Colloidal lead halide perovskite nanocrystals (NCs) have recently emerged as versatile photonic sources. Their processing and optoelectronic applications are hampered by the loss of colloidal stability and structural integrity due to the facile desorption of surface capping molecules during isolation and purification. To address this issue, herein, we propose a new ligand capping strategy utilizing common and inexpensive long-chain zwitterionic molecules such as 3-(N,N-dimethyloctadecylammonio)propanesulfonate, resulting in much improved chemical durability. In particular, this class of ligands allows for the isolation of clean NCs with high photoluminescence quantum yields (PL QYs) of above 90% after four rounds of precipitation/redispersion along with much higher overall reaction yields of uniform and colloidal dispersible NCs. Densely packed films of these NCs exhibit high PL QY values and effective charge transport. Consequently, they exhibit photoconductivity and low thresholds for amplified spontaneous emission of 2 μJ cm–2 under femtosecond optical excitation and are suited for efficient light-emitting diodes.

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“…The ASE threshold of 2 μJ cm 2 (with 100 fs pulses, Figure 3 b) is one of the lowest values reported for solution-processed NC films. 14 , 38 − 41 …”

mentioning

confidence: 99%

Colloidal CsPbX₃ (X = Cl, Br, I) Nanocrystals 2.0: Zwitterionic Capping Ligands for Improved Durability and Stability

et al. 2018

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“…The four binary compounds made up by the four elements have different kinetic properties (see Scheme 1 a for K sp of four binary compounds), and the order of formation speeds of the four compounds (CdSe, CdS, ZnSe and ZnS) should be coincident with the sequence of radial distribution of the four compounds in the CdZnSeS QDs. Since the four compounds have similar chemical properties, well-defined interfaces between layers of different compounds are replaced by gradually varied alloy phases [ 21 , 22 , 23 ]. Scheme 1 b shows the core–shell structure of CdZnSeS QDs with the chemical composition gradient, which treats CdSe and CdS as core, ZnSe as middle shell and ZnS as outer shell.…”

Section: Resultsmentioning

confidence: 99%

Quaternary Alloy Quantum Dots as Fluorescence Probes for Total Acidity Detection of Paper-Based Relics

Wang

Cheng

et al. 2021

Nanomaterials

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Traditionally, the acidity of paper-based relics was determined by an extraction method and using a pH meter. This method could not obtain the total acidity of the paper-based relics because it only detected the concentration of free protons in the aqueous soaking solution. To overcome this defect, a new method for determining the total acidity of paper-based relics has been established by using quaternary alloy quantum dots. The quantum dots, CdZnSeS, modified by p-Aminothiophenol (pATP) were prepared, and their composition and structure were characterized. The fluorescence behavior of prepared quantum dots with acidity was investigated. The following results were obtained. The fluorescence of CdZnSeS-pATP quantum dots could decrease with increases in acidity because pATP dissociated from the surfaces of the quantum dots due to protons or undissociated weak acids. Based on this feature, a method for determining the acidity of paper-based relics was constructed, and this method was used to evaluate the acidity of actual paper-based relics. Obviously, for a given paper sample, since both free protons and bound protons can be determined by this method, the acidity measured by this method is more reasonable than that by pH meter.

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“…The use of an alloyed compositiont op roduce NCs exhibiting opticalg ain was also adopted by Wang et al,w ho showed that quarternarya lloyedC d (1-x) Zn x Se (1-y) S y /ZnS core-shell NCs could exhibit ASE at green wavelengths with remarkably low thresholds of approximately 80 mJcm À2 . [31] In their approach, the core is kept large ( % 10 nm diameter) and the wavelengths of emission are varied by tuning the composition of the alloy. Given the large size of the core, the absorption cross-section is increased, quantumc onfinement is weak and Auger decay processes are inefficient compared with CdSe NCs emitting at the same wavelength.…”

Section: García-santamaría Et Al Demonstrated That Cdse Ncs Withmentioning

confidence: 99%

Wet‐Chemically Synthesized Colloidal Semiconductor Nanostructures as Optical Gain Media

et al. 2016

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An overview on the development of wet-chemically synthesized semiconductor nanostructures as optical gain materials is presented in this Review, beginning with the first demonstration of amplified spontaneous emission in zero-dimensional quantum dots and evolving to more sophisticated heterostructures such as one-dimensional core-seeded nanorods, branched core-seeded tetrapods and two-dimensional nanoplatelets. The advantages and challenges of utilizing strongly quantum-confined colloidal semiconductor materials as gain media are discussed, and a concerted effort is made to elaborate on how the progression towards more structurally complex architectures has allowed for dramatic improvements in performance and stability over the archetypal quantum dot.

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Quaternary Alloy Quantum Dots: Toward Low‐Threshold Stimulated Emission and All‐Solution‐Processed Lasers in the Green Region

Cited by 36 publications

References 38 publications

Colloidal CsPbX₃ (X = Cl, Br, I) Nanocrystals 2.0: Zwitterionic Capping Ligands for Improved Durability and Stability

Colloidal CsPbX₃ (X = Cl, Br, I) Nanocrystals 2.0: Zwitterionic Capping Ligands for Improved Durability and Stability

Quaternary Alloy Quantum Dots as Fluorescence Probes for Total Acidity Detection of Paper-Based Relics

Wet‐Chemically Synthesized Colloidal Semiconductor Nanostructures as Optical Gain Media

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Quaternary Alloy Quantum Dots: Toward Low‐Threshold Stimulated Emission and All‐Solution‐Processed Lasers in the Green Region

Cited by 36 publications

References 38 publications

Colloidal CsPbX3 (X = Cl, Br, I) Nanocrystals 2.0: Zwitterionic Capping Ligands for Improved Durability and Stability

Colloidal CsPbX3 (X = Cl, Br, I) Nanocrystals 2.0: Zwitterionic Capping Ligands for Improved Durability and Stability

Quaternary Alloy Quantum Dots as Fluorescence Probes for Total Acidity Detection of Paper-Based Relics

Wet‐Chemically Synthesized Colloidal Semiconductor Nanostructures as Optical Gain Media

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Product

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Colloidal CsPbX₃ (X = Cl, Br, I) Nanocrystals 2.0: Zwitterionic Capping Ligands for Improved Durability and Stability

Colloidal CsPbX₃ (X = Cl, Br, I) Nanocrystals 2.0: Zwitterionic Capping Ligands for Improved Durability and Stability