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Vol. 226, Issue 10, October 2018, pp. 62-70

 

Bullet

 

Photophysics of Energy Transfer Between Rh 6G and Oxz 9 Dyes in New Solid Matrices
 

1 F. H. Alkallas, 1 T. A. AL-Rebdi and 2 V. Masilamani

1 Princess Nourah Bint Abdulrahman University, Laser Laboratory, Physics Department., Riyadh, Saudi Arabia,
2 King Saud University, Physics Department, Riyadh, Saudi Arabia
1 Tel.: + 966118236149, 2 Tel.:+ 966118236148

E-mail: fhalkhallas@pnu.edu.sa, taalrebdi@pnu.edu.sa, masila123@g.mail

 

Received: 25 June 2018 /Accepted: 31 August 2018 /Published: 31 October 2018

Digital Sensors and Sensor Sysstems

 

Abstract: In this paper, radiative and nonradiative energy transfer from laser dye Rhodamine (Rh 6G) as a donor to Oxazine 9 (Oxz 9) as an acceptor in solid polymer matrices, namely modified poly methyl methacrylate (MPMMA) and new solid polymer host media, modified poly glycidyl methacrylate (MPGMA) are investigated by using the steady-state emission measurement and energy transfer at two types of concentrations (high and low). The fluorescence intensity of the acceptor is improved due to the introduction of the donor in both solid media. Energy transfer parameters, including the radiative and nonradiative energy transfer rate constants (Kr and Knr), quenching and energy transfer rate constant (Ksv and KET), critical distance (Ro), and energy transfer efficiency are investigated using the Stern-Volmer plots. The acceptor concentration dependencies of transfer efficiencies and probabilities are also obtained. The values of Kr for D-A in high concentrations system are larger than values of Knr, in two solid media, whereas nonradiative energy transfer is predominant in low concentrations. The results indicate that the dominant mechanism responsible for the energy transfer in the dye mixture systems is of the radiative type in high concentrations, and nonradiative type in low concentrations.

 

Keywords: Radiative and nonradiative energy transfer, Fluorescence quantum yield, Energy transfer rate constants, Modified poly glycidyl methacrylate (MPGMA).

 

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