Journal ArticleDOI
Size Effects on the Optical Properties of Organic Nanoparticles
Hong-Bing Fu and,Jiannian Yao +1 more
Reads0
Chats0
TLDR
In this article, an extended charge transfer (CT) state stemming from PDDP molecules closely stacking in nanoparticles and observed its shift to the high-energy side with decreasing nanoparticle size due to exciton confinement.Abstract:
Nanoparticles of 1-phenyl-3-((dimethylamino)styryl)-5-((dimethylamino)phenyl)-2-pyrazoline (PDDP) ranging from tens to hundreds of nanometers were prepared by using the reprecipitation method. Their excitonic transitions responsible for absorption and emission, as compared with those of dilute solution, have been investigated as a function of nanoparticle size. We found that PDDP nanoparticles possess a special size dependence in their optical properties. We identified an extended charge-transfer (CT) state stemming from PDDP molecules closely stacking in nanoparticles and observed its shift to the high-energy side with decreasing nanoparticle size due to exciton confinement. At the same time, the molecular π−π* absorption of the nanoparticles was also blue-shifted, accompanied by an almost unchanging n−π* absorption as a result of the reduced overlap of the pyrazoline ring π orbital and decreased intermolecular interactions. Moreover, S1 and CT states were in equilibrium in the nanoparticles, and the pro...read more
Citations
More filters
Journal ArticleDOI
Quantum dots versus organic dyes as fluorescent labels
TL;DR: This work compares and evaluates the differences in physicochemical properties of common fluorescent labels, focusing on traditional organic dyes and QDs, to provide a better understanding of the advantages and limitations of both classes of chromophores.
Journal ArticleDOI
Prospects of Nanoscience with Nanocrystals
Maksym V. Kovalenko,Liberato Manna,Liberato Manna,Andreu Cabot,Zeger Hens,Dmitri V. Talapin,Dmitri V. Talapin,Cherie R. Kagan,Victor I. Klimov,Andrey L. Rogach,Peter Reiss,Delia J. Milliron,Philippe Guyot-Sionnnest,Gerasimos Konstantatos,Wolfgang J. Parak,Taeghwan Hyeon,Brian A. Korgel,Christopher B. Murray,Wolfgang Heiss,Wolfgang Heiss +19 more
TL;DR: The state of the art in research on colloidal NCs is reviewed focusing on the most recent works published in the last 2 years, where semiconductor NCs hold unique promise for near- and mid-infrared technologies, where very few semiconductor materials are available.
Journal ArticleDOI
Chemically tailorable colloidal particles from infinite coordination polymers
Moonhyun Oh,Chad A. Mirkin +1 more
TL;DR: It is shown that simple addition of an initiation solvent to a precursor solution of metal ions and metalloligands results in the spontaneous and fully reversible formation of a new class of metal–metallolIGand particles.
Journal ArticleDOI
State of the Art and Prospects for Halide Perovskite Nanocrystals.
Amrita Dey,Junzhi Ye,Apurba De,Elke Debroye,Seung Kyun Ha,Eva Bladt,Anuraj S. Kshirsagar,Ziyu Wang,Jun Yin,Jun Yin,Yue Wang,Li Na Quan,Li Na Quan,Fei Yan,Mengyu Gao,Mengyu Gao,Xiaoming Li,Javad Shamsi,Tushar Debnath,Muhan Cao,Manuel A. Scheel,Sudhir Kumar,Julian A. Steele,Marina Gerhard,Lata Chouhan,Ke Xu,Ke Xu,Xian-Gang Wu,Yanxiu Li,Yangning Zhang,Anirban Dutta,Chuang Han,Ilka Vincon,Andrey L. Rogach,Angshuman Nag,Anunay Samanta,Brian A. Korgel,Chih-Jen Shih,Daniel R. Gamelin,Dong Hee Son,Haibo Zeng,Haizheng Zhong,Handong Sun,Hilmi Volkan Demir,Hilmi Volkan Demir,Ivan G. Scheblykin,Iván Mora-Seró,Jacek K. Stolarczyk,Jin Z. Zhang,Jochen Feldmann,Johan Hofkens,Johan Hofkens,Joseph M. Luther,Julia Pérez-Prieto,Liang Li,Liberato Manna,Maryna I. Bodnarchuk,Maryna I. Bodnarchuk,Maksym V. Kovalenko,Maksym V. Kovalenko,Maarten B. J. Roeffaers,Narayan Pradhan,Omar F. Mohammed,Osman M. Bakr,Peidong Yang,Peter Müller-Buschbaum,Prashant V. Kamat,Qiaoliang Bao,Qiao Zhang,Roman Krahne,Raquel E. Galian,Samuel D. Stranks,Sara Bals,Vasudevanpillai Biju,William A. Tisdale,Yong Yan,Robert L. Z. Hoye,Lakshminarayana Polavarapu,Lakshminarayana Polavarapu +78 more
TL;DR: A comprehensive review of metal-halide perovskite nanocrystals can be found in this article, where researchers having expertise in different fields (chemistry, physics, and device engineering) have joined together to provide a state-of-the-art overview and future prospects of metalhalide nanocrystal research.
Journal ArticleDOI
Review: biologically active pyrazole derivatives
TL;DR: In this article, the authors summarize strategies to synthesize pyrazole derivatives and demonstrate that this class of compounds can be targeted for the discovery of new drugs and can be readily prepared owing to recent advances in synthetic medicinal chemistry.
References
More filters
Journal ArticleDOI
Semiconductor Clusters, Nanocrystals, and Quantum Dots
TL;DR: In this article, the authors focus on the properties of quantum dots and their ability to join the dots into complex assemblies creates many opportunities for scientific discovery, such as the ability of joining the dots to complex assemblies.
Journal ArticleDOI
Single-Crystal Colloidal Multilayers of Controlled Thickness
TL;DR: In this article, the spontaneous crystallization of monodisperse silica spheres into close-packed arrays is exploited for optical characterization of planar materials with diffractive optical properties.
Journal ArticleDOI
Ultrathin Organic Films Grown by Organic Molecular Beam Deposition and Related Techniques.
TL;DR: This paper is a review of recent progress made in organic thin films grown in ultrahigh vacuum or using other vapor-phase deposition methods and describes the most important work which has been published in this field since the emergence of OMBD in the mid-1980s.
Journal ArticleDOI
Quantum size effects in metal particles
TL;DR: In this paper, a general review of experimental work is presented in order to permit a comprehensive evaluation of current understanding of the quantum size effect on the electronic spectrum including magnetic susceptibility, nuclear magnetic resonance, electron spin resonance, heat capacity, optical, and infrared absorption measurements.