Effects of temperature on the solid-surface luminescence properties of p-aminobenzoic acid adsorbed on sodium acetate

1987 ◽  
Vol 59 (3) ◽  
pp. 432-436 ◽  
Author(s):  
S. M. Ramasamy ◽  
R. J. Hurtubise
Keyword(s):  
Solid Surface ◽  
Sodium Acetate ◽  
Luminescence Properties ◽  
Aminobenzoic Acid ◽  
Surface Luminescence ◽  
Effects Of Temperature

Comparative Study of the Solid-Matrix Luminescence Properties of Perdeuterated Phenanthrene and Phenanthrene Adsorbed on Several Solid Matrices

1996 ◽  
Vol 50 (9) ◽  
pp. 1140-1144 ◽  
Author(s):  
Savakkattupalayam M. Ramasamy ◽  
Robert J. Hurtubise
Keyword(s):  
Rate Constants ◽  
Singlet State ◽  
Luminescence Properties ◽  
Solid Matrix ◽  
Deuterium Isotope Effect ◽  
Excited Singlet ◽  
Excited Triplet ◽  
Wide Range ◽  
Solid Matrices ◽  
Effects Of Temperature

Temperature was varied over a wide range to determine its effect on the luminescence properties of deuterated phenanthrene and phenanthrene adsorbed on a number of solid matrices. Not only were insights into the effects of temperature and solid matrices on the luminescence properties acquired but also the deuterium isotope effect revealed unique information about the role played by the solid matrix in the luminescence of the model compounds. In addition, comparisons of nonradiative rate constants and the efficiencies of intersystem crossing revealed important differences among the solid matrices in altering these parameters. The perdeuterated phenanthrene and phenanthrene proved to be useful probes for investigating the effects of solid matrices on the excited triplet state of phosphors because the excited singlet state of the lumiphor was affected very little by the solid matrices, and the rate constants of phosphorescence for the two phosphors are essentially the same.

Solid-Matrix Luminescence Polarization of p-Aminobenzoate Adsorbed on Sodium Acetate and Sodium Acetate/Sodium Chloride Mixtures

1992 ◽  
Vol 46 (3) ◽  
pp. 472-475 ◽  
Author(s):  
S. M. Ramasamy ◽  
R. J. Hurtubise
Keyword(s):  
Sodium Acetate ◽  
Three Dimensional ◽  
Solid Matrix ◽  
Quantum Yields ◽  
Rotational Relaxation ◽  
Aminobenzoic Acid ◽  
Polarization Data ◽  
Yield Data ◽  
Temperature Range ◽  
Luminescence Polarization

Luminescence polarization values for the anion of p-aminobenzoic acid adsorbed on sodium acetate were obtained over a wide temperature range. Also, luminescence polarization values were obtained for p-aminobenzoate on a variety of sodium acetate/NaCl mixtures at 296 and 93 K. For the anion of p-aminobenzoic acid adsorbed on sodium acetate, the fluorescence and phosphorescence polarization values were essentially constant with temperature. The phosphorescence polarization data indicated that the anion of p-aminobenzoic acid did not undergo rotational relaxation over the temperature range investigated; thus rotational processes did not contribute to nonradiative deactivation. Vibrational processes were primarily responsible for the decrease in phosphorescence quantum yields as the temperature increased. For the luminescence polarization data with the sodium acetate/NaCl mixtures, little change was observed for both the fluorescence polarization data and phosphorescence polarization data at the two different temperatures. These data indicated, along with earlier luminescence quantum yield data, that the three-dimensional bonding characteristics of the solid-matrix are very important in obtaining a high luminescence yield.

SOLID-SURFACE LUMINESCENCE SPECTROMETRY

1989 ◽  
Vol 61 (15) ◽  
pp. 889A-895A ◽  
Author(s):  
Robert J. Hurtubise
Keyword(s):  
Solid Surface ◽  
Surface Luminescence ◽  
Luminescence Spectrometry

The Effects of Temperature on the Solid-Surface Luminescence Properties of Benzo(f)quinoline Adsorbed on Filter Paper

1989 ◽  
Vol 43 (4) ◽  
pp. 616-621 ◽  
Author(s):  
S. M. Ramasamy ◽  
R. J. Hurtubise
Keyword(s):  
Quantum Yield ◽  
Solid Surface ◽  
Filter Paper ◽  
Rate Constants ◽  
Protonated Form ◽  
Solid Matrix ◽  
Phosphorescence Lifetime ◽  
Phosphorescence Quantum Yield ◽  
Surface Luminescence ◽  
Experimental Values

Experimental values of fluorescence quantum yield, phosphorescence quantum yield, and phosphorescence lifetime were acquired at temperatures from 23° to −180°C for the protonated form of benzo( f)quinoline adsorbed on filter paper. From the experimental values, triplet formation efficiencies, rate constants for phosphorescence, and rate constants for the radiationless transition from the triplet state were calculated. The results showed the various interrelationships of the solid-surface radiative and nonradiative processes. In addition, the results indicated that the modulus of the solid matrix is an important factor in enhancing phosphorescence quantum yield.

Determination of p-aminobenzoic acid by room temperature solid surface phosphorescence

1976 ◽  
Vol 48 (12) ◽  
pp. 1784-1788 ◽  
Author(s):  
R. M. A. Von Wandruszka ◽  
R. J. Hurtubise
Keyword(s):  
Solid Surface ◽  
Room Temperature ◽  
Aminobenzoic Acid

Room-Temperature Luminescence Properties of p-Aminobenzoic Acid and 4-Phenylphenol Adsorbed on α-Cyclodextrin/NaCl Mixtures

1988 ◽  
Vol 42 (4) ◽  
pp. 619-624 ◽  
Author(s):  
J. M. Bello ◽  
R. J. Hurtubise
Keyword(s):  
Quantum Yield ◽  
Solid Surface ◽  
Rate Constants ◽  
Room Temperature ◽  
Aminobenzoic Acid ◽  
Phosphorescence Lifetime ◽  
Phosphorescence Quantum Yield ◽  
Sample Preparation Procedure ◽  
Nonradiative Transitions ◽  
Yield Values

The solid-surface fluorescence and phosphorescence quantum yield values and phosphorescence lifetime values were obtained for p-aminobenzoic acid (PABA) and 4-phenylphenol adsorbed on α-cyclodextrin/NaCl mixtures. From the luminescence quantum yield and phosphorescence lifetime data, the triplet formation efficiency values, the phosphorescence rate constants, and the rate constants for radiationless transition from the triplet state were determined for PABA and 4-phenylphenol on α-cyclodextrin/NaCl mixtures. In addition, the percentages of radiative and nonradiative transitions were calculated for the two compounds. The various luminescence parameters obtained in this work provided important insights into the analyte/α-cyclodextrin substrate interactions responsible for the observed solid-surface room-temperature fluorescence (RTF) and phosphorescence (RTP). Furthermore, the RTF and RTP intensities of PABA and 4-phenylphenol were obtained from several α-cyclodextrin/NaCl mixtures. These data showed the importance of the initial wet chemistry in the sample preparation procedure.

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