A Multipulse Time-Resolved Fluorescence Method for Probing Second-Order Recombination Dynamics in Colloidal Quantum Dots

2014 ◽  
Vol 118 (26) ◽  
pp. 14692-14702 ◽  
Author(s):  
Gaurav Singh ◽  
Michael A. Guericke ◽  
Qing Song ◽  
Marcus Jones
Keyword(s):  
Quantum Dots ◽  
Second Order ◽  
Fluorescence Method ◽  
Colloidal Quantum Dots ◽  
Time Resolved Fluorescence ◽  
Time Resolved ◽  
Recombination Dynamics

FRET Study Between Carbon Quantum Dots and Malachite Green by Steady-State and Time-Resolved Fluorescence Spectroscopy

2020 ◽  
Vol 10 (3) ◽  
pp. 178-188
Author(s):  
Bipin Rooj ◽  
Ankita Dutta ◽  
Debojyoti Mukherjee ◽  
Sahidul Islam ◽  
Ujjwal Mandal
Keyword(s):  
Quantum Dots ◽  
Energy Transfer ◽  
Fluorescence Spectroscopy ◽  
Malachite Green ◽  
Dye Degradation ◽  
Fluorescence Emission ◽  
Carbon Quantum Dots ◽  
Time Resolved Fluorescence ◽  
Physical Processes ◽  
Time Resolved

Background: Understanding the interaction between different organic dyes and carbon quantum dots helps us to understand several photo physical processes like electron transfer, energy transfer, molecular sensing, drug delivery and dye degradation processes etc. Objective: The primary objective of this study is to whether the carbon quantum dots can act as an electron donor and can participate in the different photo physical processes. Methods: In this work, Carbon Quantum Dots (CQDLs) are synthesized in most economical and simple carbonization method where petals of Nelumbo nucifera L. are used as a carbon precursor. The synthesized CQDLs were characterized by using experimental techniques like UV−Vis absorption, FT-IR, Transmission Electron Microscopy (TEM), steadystate and time-resolved fluorescence spectroscopy. Results: The spectral analysis shows that the so synthesized CQDLs are spherical in shape and its diameter is around 4.2 nm. It shows the fluorescence emission maximum at 495 nm with a quantum yield of 4%. In this work the interaction between Carbon Quantum Dots (CQDLs) and an organic dye Malachite Green (MG) is studied using fluorescence spectroscopic technique under ambient pH condition (At pH 7). The quenching mechanism of CQDLs with MG was investigated using Stern-Volmer equation and time-resolved fluorescence lifetime studies. The results show that the dominant process of fluorescence quenching is attributed to Forster Resonance Energy Transfer (FRET) having a donor acceptor distance of 53 Å where CQDLs act as a donor and MG acts as an acceptor. Conclusion: This work has a consequence that CQDLs can be used as a donor species for different photo physical processes such as photovoltaic cell, dye sensitized solar cell, and also for antioxidant activity study.

Steady-state and time-resolved fluorescence studies on interactions of carbon “quantum” dots with nitrotoluenes

2017 ◽  
Vol 468 ◽  
pp. 300-307 ◽  
Author(s):  
Gregory E. LeCroy ◽  
K.A. Shiral Fernando ◽  
Christopher E. Bunker ◽  
Ping Wang ◽  
Nicholas Tomlinson ◽  
...  
Keyword(s):  
Quantum Dots ◽  
Steady State ◽  
Carbon Quantum Dots ◽  
Time Resolved Fluorescence ◽  
Time Resolved ◽  
Fluorescence Studies

scholarly journals Effect of Chloride Passivation on Recombination Dynamics in CdTe Colloidal Quantum Dots

ChemPhysChem ◽  
2015 ◽  
Vol 16 (6) ◽  
pp. 1239-1244 ◽  
Author(s):  
Daniel Espinobarro‐Velazquez ◽  
Marina A. Leontiadou ◽  
Robert C. Page ◽  
Marco Califano ◽  
Paul O'Brien ◽  
...  
Keyword(s):  
Quantum Dots ◽  
Colloidal Quantum Dots ◽  
Recombination Dynamics

scholarly journals Mechanisms of fluorescence decays of colloidal CdSe–CdS/ZnS quantum dots unraveled by time-resolved fluorescence measurement

2015 ◽  
Vol 17 (41) ◽  
pp. 27588-27595 ◽  
Author(s):  
Hao Xu ◽  
Volodymyr Chmyrov ◽  
Jerker Widengren ◽  
Hjalmar Brismar ◽  
Ying Fu
Keyword(s):  
Quantum Dots ◽  
Radiative Recombination ◽  
Energy Relaxation ◽  
Fluorescence Decay ◽  
Fluorescence Measurement ◽  
Time Resolved Fluorescence ◽  
Time Resolved ◽  
Decay Spectrum

The fluorescence decay spectrum of colloidal CdSe-based quantum dots is characterized by energy relaxation and radiative recombination of photoexcited excitons.

A sensitive sandwich structure time-resolved fluorescence method for thrombin detection

2018 ◽  
Vol 10 (34) ◽  
pp. 4178-4182 ◽  
Author(s):  
Tao Wu ◽  
Yuanfu Zhang ◽  
Tingting Hou ◽  
Yinghong Zhang ◽  
Shuhao Wang
Keyword(s):  
Sandwich Structure ◽  
Fluorescence Assay ◽  
Fluorescence Method ◽  
Specific Time ◽  
Time Resolved Fluorescence ◽  
Time Resolved ◽  
Human Thrombin

We designed a sensitive and specific time-resolved fluorescence assay for detection of human thrombin.

Manganese-Doped ZnSe Quantum Dots as a Probe for Time-Resolved Fluorescence Detection of 5-Fluorouracil

2011 ◽  
Vol 83 (23) ◽  
pp. 9076-9081 ◽  
Author(s):  
Dong Zhu ◽  
Yun Chen ◽  
Liping Jiang ◽  
Jun Geng ◽  
Jianrong Zhang ◽  
...  
Keyword(s):  
Quantum Dots ◽  
Fluorescence Detection ◽  
Time Resolved Fluorescence ◽  
Time Resolved
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