Temperature-dependent fluorescence decay and energy transfer in Nd/Cr:YAG ceramics

2019 ◽  
Vol 90 ◽  
pp. 215-219 ◽  
Author(s):  
Yoshiyuki Honda ◽  
Shinji Motokoshi ◽  
Takahisa Jitsuno ◽  
Kana Fujioka ◽  
Masahiro Nakatsuka ◽  
...  
Keyword(s):  
Energy Transfer ◽  
Fluorescence Decay ◽  
Temperature Dependent

Synthesis and Photophysical Properties of a Conformationally Flexible Mixed Porphyrin Star-Pentamer

2009 ◽  
Vol 62 (7) ◽  
pp. 692 ◽  
Author(s):  
Toby D. M. Bell ◽  
Sheshanath V. Bhosale ◽  
Kenneth P. Ghiggino ◽  
Steven J. Langford ◽  
Clint P. Woodward
Keyword(s):  
Energy Transfer ◽  
Photophysical Properties ◽  
Fluorescence Decay ◽  
High Yield ◽  
Free Base ◽  
Time Resolved ◽  
Zinc Porphyrin ◽  
Relative Contribution ◽  
Synthetic Strategy ◽  
Decay Times

The synthesis of a porphyrin star-pentamer bearing a free-base porphyrin core and four zinc(ii) metalloporphyrins, which are tethered by a conformationally flexible linker about the central porphyrin’s antipody, is described. The synthetic strategy is highlighted by the use of olefin cross metathesis to link the five chromophores together in a directed fashion in high yield. Photoexcitation into the Soret absorption band of the zinc porphyrin chromophores at 425 nm leads to a substantial enhancement of central free-base porphyrin fluorescence, indicating energy transfer from the photoexcited zinc porphyrin (outer periphery) to central free-base porphyrin. Time-resolved fluorescence decay profiles required three exponential decay components for satisfactory fitting. These are attributed to emission from the central free-base porphyrin and to two different rates of energy transfer from the zinc porphyrins to the free-base porphyrin. The faster of these decay components equates to an energy-transfer rate constant of 3.7 × 109 s–1 and an efficiency of 83%, whereas the other is essentially unquenched with respect to reported values for zinc porphyrin fluorescence decay times. The relative contribution of these two components to the initial fluorescence decay is ~3:2, similar to the 5:4 ratio of cis and trans geometric isomers present in the pentamer.

scholarly journals Donor fluorescence decay analysis for energy transfer in double-helical DNA with various acceptor concentrations

Biopolymers ◽  
2000 ◽  
Vol 57 (5) ◽  
pp. 306-315 ◽  
Author(s):  
Shin-Ichi Murata ◽  
Józef Kuśba ◽  
Grzegorz Piszczek ◽  
Ignacy Gryczynski ◽  
Joseph R. Lakowicz
Keyword(s):  
Energy Transfer ◽  
Fluorescence Decay

Fluorescence energy transfer studies in a cross-linked polyurethane network

1995 ◽  
Vol 73 (11) ◽  
pp. 1823-1830 ◽  
Author(s):  
Jie Yang ◽  
Mitchell A. Winnik
Keyword(s):  
Energy Transfer ◽  
Fluorescence Quenching ◽  
Fluorescence Decay ◽  
Critical Distance ◽  
Nonradiative Energy Transfer ◽  
Fluorescence Energy Transfer ◽  
Distribution Analysis ◽  
Analysis Method ◽  
Acceptor Concentration ◽  
Fluorescence Energy

A series of cross-linked polyurethane samples, labeled with dyes suitable for fluorescence energy transfer experiments, were prepared (donor, phenanthrene; acceptor, anthracene). Fluorescence decay profiles for these samples were measured as a function of acceptor concentration. These decays obey Förster nonradiative energy transfer kinetics, with an energy transfer critical distance (R0) of 26.7 Å. Fluorescence intensities, calculated from the decays by integrating the decay profiles, also fit the Perrin model, with a quenching radius (Rs) of 25.6 Å. The fluorescence decay profiles were further examined with a distribution analysis method, which also revealed uniformly distributed donors and acceptors in the polymer matrices. Keywords: fluorescence quenching, fluorescence decay, phenanthrene, anthracene, polyurethane.

Temperature-dependent luminescence and energy transfer in Europium and rare-earth-codoped nanostructured sol-gel SiO 2 glasses

1999 ◽  
Author(s):  
Srinivasa Buddhudu ◽  
Makoto Morita ◽  
Hong X. Zhang ◽  
Chan Hin Kam ◽  
Yee Loy Lam ◽  
...  
Keyword(s):  
Energy Transfer ◽  
Rare Earth ◽  
Sol Gel ◽  
Temperature Dependent

Temperature-dependent luminescence and energy transfer properties of Tb3+ and Eu3+ doped barium borate glasses

2017 ◽  
Vol 181 ◽  
pp. 31-35 ◽  
Author(s):  
Sebastian Loos ◽  
Franziska Steudel ◽  
Bernd Ahrens ◽  
Stefan Schweizer
Keyword(s):  
Energy Transfer ◽  
Borate Glasses ◽  
Barium Borate ◽  
Temperature Dependent ◽  
Transfer Properties

Concentration-dependent fluorescence decay and energy transfer in Cr3+ and Nd3+ co-doped Y3Al5O12 ceramic powder

2021 ◽  
Vol 60 (3) ◽  
pp. 032001
Author(s):  
Yoshiyuki Honda ◽  
Shinji Motokoshi ◽  
Takahisa Jitsuno ◽  
Kana Fujioka ◽  
Toshihiro Yamada ◽  
...  
Keyword(s):  
Energy Transfer ◽  
Ceramic Powder ◽  
Fluorescence Decay ◽  
Co Doped

Temperature Dependent Charge/Energy Transfer Studies of PEDOT:PSS-TiO2 Composites

2019 ◽  
pp. 387-390
Author(s):  
Jyoti Bansal ◽  
Tarnija Sarao ◽  
Reena Kumari ◽  
Ritu Srivastav ◽  
A. K. Hafiz ◽  
...  
Keyword(s):  
Energy Transfer ◽  
Temperature Dependent ◽  
Charge Energy
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