A Novel Optical Oxygen Sensing Based on Quenching of Photoexcited Triplet State of C70in Polystyrene Film by Oxygen Using Time-resolved Spectroscopy

1999 ◽  
Vol 28 (2) ◽  
pp. 183-184 ◽  
Author(s):  
Yutaka Amao ◽  
Keisuke Asai ◽  
Ichiro Okura
Keyword(s):  
Triplet State ◽  
Oxygen Sensing ◽  
Polystyrene Film ◽  
Time Resolved ◽  
Time Resolved Spectroscopy

Oxygen sensing based on lifetime of photoexcited triplet state of platinum porphyrin-polystyrene film using time-resolved spectroscopy

2000 ◽  
Vol 04 (03) ◽  
pp. 292-299 ◽  
Author(s):  
YUTAKA AMAO ◽  
KEISUKE ASAI ◽  
ICHIRO OKURA
Keyword(s):  
Triplet State ◽  
Flash Photolysis ◽  
Laser Flash Photolysis ◽  
Oxygen Sensing ◽  
Laser Flash ◽  
Quenching Rate ◽  
Time Resolved ◽  
Quenching Rate Constant ◽  
Volmer Plot ◽  
Platinum Porphyrin

Optical oxygen-sensing systems based on the quenching of the photoexcited triplet state of platinum porphyrins—platinum octaethylporphyrin (PtOEP) and platinum tetrakis(pentafluorophenyl)porphyrin (PtTFPP)—in polystyrene (PS) using two different time-resolved spectroscopies (luminescence lifetime measurement and diffuse reflectance laser flash photolysis) have been developed. Using both spectroscopies, the same values of Stern-Volmer constant KSV and quenching rate constant kq (KSV = kqτ0) are obtained. The decays of the luminescence and triplet-triplet reflectance of the platinum porphyrins in PS consisted of two components (faster and slower lifetimes) in the absence and presence of oxygen. For both faster and slower components the lifetime decreases with increasing oxygen concentration. For both components a Stern-Volmer plot of the platinum porphyrin-PS films exhibits linearity. However, kq of the faster component is larger than that of the slower component (for PtOEP, three times larger; for PtTFPP, 40 times larger), indicating that two different oxygen-accessible sites exist in the platinum porphyrin-PS films. The faster and slower components are related to oxygen-accessible sites on the surface and in the bulk of the platinum porphyrin films respectively. Concerning the fractional contributions of each lifetime component, the contribution of the faster component is greater than that of the slower component, indicating that the sensing site on the surface is important for optical sensing. The contribution of different oxygen-accessible sites in platinum porphyrin-PS films for oxygen sensing is clarified by these techniques.

Time-resolved spectroscopy study of the triplet state of 4-diethylaminobenzonitrile (DEABN)

2003 ◽  
Vol 5 (17) ◽  
pp. 3643 ◽  
Author(s):  
W. M. Kwok ◽  
C. Ma ◽  
P. Matousek ◽  
A. W. Parker ◽  
D. Phillips ◽  
...  
Keyword(s):  
Triplet State ◽  
Spectroscopy Study ◽  
Time Resolved ◽  
Time Resolved Spectroscopy

scholarly journals Photophysical properties and fluorosolvatochromism of D–π–A thiophene based derivatives

RSC Advances ◽  
2020 ◽  
Vol 10 (71) ◽  
pp. 43459-43471
Author(s):  
Hussain A. Z. Sabek ◽  
Ahmed M. M. Alazaly ◽  
Dina Salah ◽  
Hesham S. Abdel-Samad ◽  
Mohamed A. Ismail ◽  
...  
Keyword(s):  
Photophysical Properties ◽  
Fluorescence Emission ◽  
Time Resolved ◽  
Time Resolved Spectroscopy ◽  
Solvation Models

Solvation-dependent photophysical properties of two push–pull thiophene-based compounds with donor–π–acceptor (D–π–A) structures were investigated using absorption, fluorescence emission and time resolved spectroscopy, and supported by different solvation models.

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