Core/Shell Quantum Dots Encapsulated in Biocompatible Oil-Core Nanocarriers as Two-Photon Fluorescent Markers for Bioimaging

Langmuir ◽  
2014 ◽  
Vol 30 (49) ◽  
pp. 14931-14943 ◽  
Author(s):  
Urszula Bazylińska ◽  
Sławomir Drozdek ◽  
Marcin Nyk ◽  
Julita Kulbacka ◽  
Marek Samoć ◽  
...  
Keyword(s):  
Quantum Dots ◽  
Core Shell ◽  
Two Photon ◽  
Fluorescent Markers

Two-photon Absorption in ZnO/ZnS Core-shell Quantum Dots

2015 ◽  
Vol 36 (2) ◽  
pp. 249-255
Author(s):  
刘姝妤 LIU Shu-yu ◽  
钟绵增 ZHONG Mian-zeng ◽  
孟秀清 MENG Xiu-qing ◽  
李京波 LI Jing-bo ◽  
王沅倩 WANG Yuan-qian ◽  
...  
Keyword(s):  
Quantum Dots ◽  
Photon Absorption ◽  
Core Shell ◽  
Two Photon Absorption ◽  
Two Photon

scholarly journals Optical nonlinearities of colloidal InP@ZnS core-shell quantum dots probed by Z-scan and two-photon excited emission

APL Materials ◽  
2015 ◽  
Vol 3 (11) ◽  
pp. 116108 ◽  
Author(s):  
Dominika Wawrzynczyk ◽  
Janusz Szeremeta ◽  
Marek Samoc ◽  
Marcin Nyk
Keyword(s):  
Quantum Dots ◽  
Core Shell ◽  
Optical Nonlinearities ◽  
Two Photon

Folic acid-conjugated core/shell ZnS:Mn/ZnS quantum dots as targeted probes for two photon fluorescence imaging of cancer cells

2011 ◽  
Vol 7 (3) ◽  
pp. 1327-1338 ◽  
Author(s):  
Malgorzata Geszke ◽  
Marek Murias ◽  
Lavinia Balan ◽  
Ghouti Medjahdi ◽  
Jaroslaw Korczynski ◽  
...  
Keyword(s):  
Quantum Dots ◽  
Folic Acid ◽  
Cancer Cells ◽  
Fluorescence Imaging ◽  
Core Shell ◽  
Two Photon ◽  
Two Photon Fluorescence ◽  
Photon Fluorescence

CdSe/AsS Core−Shell Quantum Dots: Preparation and Two-Photon Fluorescence

2009 ◽  
Vol 131 (32) ◽  
pp. 11300-11301 ◽  
Author(s):  
Junzhong Wang ◽  
Ming Lin ◽  
Yongli Yan ◽  
Zhe Wang ◽  
Paul C. Ho ◽  
...  
Keyword(s):  
Quantum Dots ◽  
Core Shell ◽  
Two Photon ◽  
Two Photon Fluorescence ◽  
Photon Fluorescence

One- and two-photon pumped soft lithographed DFB laser systems based on semiconductor core-shell quantum dots

2010 ◽  
Author(s):  
F. Todescato ◽  
I. Fortunati ◽  
S. Gardin ◽  
R. Signorini ◽  
R. Bozio ◽  
...  
Keyword(s):  
Quantum Dots ◽  
Core Shell ◽  
Two Photon ◽  
Laser Systems ◽  
Dfb Laser

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>

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