In this work, we study the effect of concentration, host medium, PH, ions complex and phase states on the fluorescence emission from the laser dye, Rhodamine B, pumping by UV laser as exited source. The polymethylmethacrylate PMMA used as host medium in case of solid phase samples while, ethanol and Tetrahydrofuran (THF) are used in case of liquid one. The Laser Induced Fluorescence (LIF) technique was used to study the fluorescence properties of the both cases 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 maximum fluorescence emission observed at concentration of Rhodamine B C=3×10-4M. At this concentration of Rhodamine B, the type of solvent and polarity of the medium affect on the fluorescence emission intensity of Rhodamine B with. The measurements revile that, the behavior of both phases state was analogous and Rhodamine B/PMMA thin film sample by ratio of 4:1 and thickness 0.12 mm is the best photostability sample and its quantum yield about ≈ 0.82. Also, the fluorescence emission intensity of Rhodamine B was quenched by complex formation of Co, Al, Cu and iodide ions with Rhodamine B due to the increase of the charge density of the ions.
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