Fikry M, Omar M M, Ismail Lotfi Z
Physics Department, Faculty of Science, Cairo University, Giza, Egypt.
J Fluoresc. 2009 Jul;19(4):741-6. doi: 10.1007/s10895-009-0470-2. Epub 2009 Feb 17.
In this work, we study the effect of concentration, host medium, PH and phase states on the fluorescence emission from the laser dye Rhodamine B pumped by UV laser as exited source. The polymethylmethacrylate PMMA is used as a host medium in case of solid phase samples while, ethanol and Tetrahydrofuran (THF) are used in case of a liquid one. Laser Induced Fluorescence (LIF) technique was used to study the fluorescence properties of both cases of liquid and thin film solid-state samples. In addition, the Dual Thermal Lens (DTL) technique was used to study the quantum yield of these samples. The concentrations of Rhodamine B in ethanol as solvent between 2 x 10(-2) M and 5 x 10(-6) M were studied. The maximum fluorescence emission is observed at concentration of Rhodamine B C = 3 x 10(-4) M. Comparison studies were investigated for different host medium such as ethanol, THF, PMMA in liquid phase state and PMMA in solid phase state. The measurements revealed that, the behavior of both phases state was analogous. Rhodamine B/PMMA thin film sample by ratio of 4:1 and thickness 0.12 mm was found to have the best photostability sample with a quantum yield about approximately 0.82.
在这项工作中，我们研究了浓度、主体介质、pH值和相态对以紫外激光作为激发源泵浦的激光染料罗丹明B荧光发射的影响。在固相样品的情况下，聚甲基丙烯酸甲酯（PMMA）用作主体介质，而在液相样品的情况下，使用乙醇和四氢呋喃（THF）。激光诱导荧光（LIF）技术用于研究液体和薄膜固态样品这两种情况下的荧光特性。此外，双热透镜（DTL）技术用于研究这些样品的量子产率。研究了罗丹明B在乙醇溶剂中的浓度范围为2×10⁻² M至5×10⁻⁶ M。在罗丹明B浓度C = 3×10⁻⁴ M时观察到最大荧光发射。对不同主体介质进行了比较研究，如液相状态下的乙醇、THF、PMMA以及固相状态下的PMMA。测量结果表明，两种相态的行为相似。发现比例为4:1且厚度为0.12 mm的罗丹明B/PMMA薄膜样品具有最佳的光稳定性，量子产率约为0.82。
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