Variable-Temperature Time-Resolved Emission Spectra Studies of Random Pyrene Urethane Methacrylate Copolymers with High Pyrene Incorporation

2013 ◽  
Vol 117 (39) ◽  
pp. 11863-11876 ◽  
Author(s):  
K. Kaushlendra ◽  
S. K. Asha
Keyword(s):  
Variable Temperature ◽  
Emission Spectra ◽  
Time Resolved ◽  
Methacrylate Copolymers ◽  
Temperature Time

Excited state dynamics of organic semi-conducting materials

2015 ◽  
Vol 177 ◽  
pp. 111-119 ◽  
Author(s):  
Kenneth P. Ghiggino ◽  
Andrew J. Tilley ◽  
Benjamin Robotham ◽  
Jonathan M. White
Keyword(s):  
Excited State ◽  
Conjugated Polymer ◽  
Variable Temperature ◽  
Emission Spectra ◽  
Time Resolved ◽  
Absorption And Emission ◽  
X Ray ◽  
X Ray Crystallography ◽  
Conducting Materials ◽  
Absorption And Emission Spectroscopy

Time-resolved absorption and emission spectroscopy has been applied to investigate the dynamics of excited state processes in oligomer models for semi-conducting organic materials. Following the photo-excitation of a pentamer oligomer that is a model for the conjugated polymer MEH-PPV, an ultrafast component of a few picoseconds is observed for the decay of the initially formed transient species. Variable temperature absorption and emission spectra combined with X-ray crystallography and calculations support the assignment of this rapid relaxation process to an excited state conformational rearrangement from non-planar to more planar molecular configurations. The implications of the results for the overall photophysics of conjugated polymers are considered.

Triplet harvesting in luminescent Cu(i) complexes by the thermally activated luminescence transition mechanism: impact of the molecular structure

2017 ◽  
Vol 5 (18) ◽  
pp. 4488-4494 ◽  
Author(s):  
Z. C. Su ◽  
C. C. Zheng ◽  
G. Cheng ◽  
C.-M. Che ◽  
S. J. Xu
Keyword(s):  
Molecular Structure ◽  
Variable Temperature ◽  
Delayed Fluorescence ◽  
Time Resolved ◽  
Thermally Induced ◽  
Thermally Activated ◽  
Transition Mechanism ◽  
Time Resolved Photoluminescence ◽  
Temperature Time ◽  
Triplet Harvesting

Thermally induced transition from ordinary phosphorescence to delayed fluorescence in two kinds of luminescent copper(i) complexes is comprehensively investigated by using variable-temperature time-integrated and time-resolved photoluminescence measurements as well as model analysis.

Optical, electrochemical and third-order nonlinear optical studies of triphenylamine substituted zinc phthalocyanine

2016 ◽  
Vol 20 (08n11) ◽  
pp. 1173-1181 ◽  
Author(s):  
Narra Vamsi Krishna ◽  
Puliparambil Thilakan Anusha ◽  
S. Venugopal Rao ◽  
L. Giribabu
Keyword(s):  
Nonlinear Optical ◽  
Emission Spectra ◽  
Optical Emission ◽  
Soret Band ◽  
Laser Pulses ◽  
Zinc Phthalocyanine ◽  
Third Order ◽  
Time Resolved ◽  
Nlo Properties ◽  
Scan Data

Zinc phthalocyanine possessing triphenylamine at its peripheral position has been synthesized and its optical, emission, electrochemical and third-order nonlinear optical (NLO) properties were investigated. Soret band was broadened due to the presence of triphenylamine moiety. Electrochemical properties indicated that both oxidation and reduction processes were ring centered. Emission spectra were recorded in different solvents and the fluorescence yields obtained were in the range of 0.02–0.17 while the time-resolved fluorescence data revealed radiative lifetimes of typically few ns. Third-order NLO properties of this molecule have been examined using the Z-scan technique with picosecond (ps) and femtoseocnd (fs) pulses. Closed and open aperture Z-scan data were recorded with 2 ps/1 50 fs laser pulses at a wavelength of 800 nm and NLO coefficients were extracted from both the data. Our data clearly suggests the potential of this molecule for photonics applications.

scholarly journals Photooxidation and Photobleaching of Single CdSe/ZnS Quantum Dots Probed by Room-Temperature Time-Resolved Spectroscopy

2001 ◽  
Vol 105 (35) ◽  
pp. 8281-8284 ◽  
Author(s):  
Wilfried G. J. H. M. van Sark ◽  
Patrick L. T. M. Frederix ◽  
Dave J. Van den Heuvel ◽  
Hans C. Gerritsen ◽  
Ageeth A. Bol ◽  
...  
Keyword(s):  
Quantum Dots ◽  
Room Temperature ◽  
Time Resolved ◽  
Time Resolved Spectroscopy ◽  
Temperature Time

Time-resolved x-ray emission spectra from optically ionized helium and neon plasmas

1998 ◽  
Vol 57 (1) ◽  
pp. 982-993 ◽  
Author(s):  
T. E. Glover ◽  
J. K. Crane ◽  
M. D. Perry ◽  
R. W. Lee ◽  
R. W. Falcone
Keyword(s):  
Emission Spectra ◽  
Time Resolved ◽  
X Ray

Energy and Charge Transfer in Electroluminescent Polymer/Porphyrin Blends

1999 ◽  
Vol 560 ◽  
Author(s):  
V. Cleave ◽  
G. Yahioglu ◽  
P. Le Barny ◽  
R.H. Friend ◽  
N. Tessler ◽  
...  
Keyword(s):  
Absorption Spectra ◽  
Charge Separation ◽  
Emission Spectra ◽  
Time Resolved ◽  
Show Evidence ◽  
Homo And Lumo ◽  
Lumo Level ◽  
Photoluminescence Efficiency ◽  
Absorption Measurements ◽  
Triplet Excitons

ABSTRACTWe present a study of the effects of blending electroluminescent polymers with platinum (II) octaethylporphyrin (PtOEP). We find that in the case of polymers which are measured to have HOMO and LUMO levels respectively below and above those of the PtOEP, and which have emission spectra overlapping the PtOEP absorption spectra, energy transfer occurs as expected. We find further evidence, in the form of steady state and time-resolved electroluminescence and photoluminescence measurements, which indicates additional transfer of triplet excitons between polymer and porphyrin. Where the polymers have emission spectra overlapping the absorption spectra of PtOEP, but which are measured to have a HOMO or LUMO level between those of the porphyrin, quenching of the photoluminescence efficiency occurs. We propose this is due to charge separation between the porphyrin and the polymer, and show evidence for this in the form of photoinduced absorption measurements.

Tuning the excited-state deactivation pathways of dinuclear ruthenium(ii) 2,2′-bipyridine complexes through bridging ligand design

2020 ◽  
Vol 49 (24) ◽  
pp. 8096-8106 ◽  
Author(s):  
Simon Cerfontaine ◽  
Ludovic Troian-Gautier ◽  
Sara A. M. Wehlin ◽  
Frédérique Loiseau ◽  
Emilie Cauët ◽  
...  
Keyword(s):  
Excited State ◽  
Steady State ◽  
Variable Temperature ◽  
Ligand Design ◽  
Binuclear Complexes ◽  
Time Resolved ◽  
Bridging Ligand ◽  
Dinuclear Ruthenium ◽  
Photophysical Study ◽  
Time Resolved Photoluminescence

A detailed photophysical study of binuclear complexes was performed using steady-state and time-resolved photoluminescence measurements at variable temperature. The results were compared with the prototypical [Ru(bpy)3]2+.

Investigation of the thermal quenching of two emission centers in Sr9MnLi(PO4)7:Eu2+ using time-resolved technique

2020 ◽  
Vol 22 (27) ◽  
pp. 15632-15639
Author(s):  
Fengfeng Chi ◽  
Wenjuan Dai ◽  
Bin Jiang ◽  
Bibo Lou ◽  
Xiantao Wei ◽  
...  
Keyword(s):  
Thermal Quenching ◽  
Emission Spectra ◽  
Time Resolved ◽  
Luminescent Centers ◽  
Schematic Diagrams

The emission spectra of two luminescent centers in Sr9MnLi(PO4)7:Eu2+ and the corresponding schematic diagrams of luminescence thermal quenching.

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