Exciting Wavelength and Concentration Related Two-Photon Fluorescence of Single and Mixed Laser Dyes
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ORIGINAL ARTICLE
Exciting Wavelength and Concentration Related Two-Photon Fluorescence of Single and Mixed Laser Dyes Linfeng Chen 1 & Xianqiong Zhong 1
&
Jiameng Xu 1
Received: 6 August 2019 / Accepted: 6 November 2019 # Springer Science+Business Media, LLC, part of Springer Nature 2019
Abstract Two-photon nonlinear process induced fluorescence of Rhodamine 6G (R6G), Rhodamine B (RB), and their mixed aqueous solutions in mass proportion of 1:1, is experimentally observed by different exciting wavelengths. It shows that, for each sample, the exciting wavelength can influence the fluorescence intensity considerably but only slightly influence the peak wavelength of the spectrum. The optimal exciting wavelengths of R6G and the mixed dyes are around 700 nm. While for RB, the optimal exciting wavelengths can be 700 nm and 620 nm. For each dye sample, the spectral red-shift will occur as increase of the solution concentration. The mixing of the two dyes will cause the spectral red-shift with regard to the single dye under our experimental conditions. Moreover, in comparison, at lower concentrations, the mixed dye has relatively intense fluorescence. This work is of significance for determining the optimal exciting wavelength and developing the tunable two-photon dye lasers. Keywords Nonlinear optics . Two-photon fluorescence . Mixed Rhodamine dyes . Optimal exciting wavelength . Spectral red-shifts
Introduction Study on fluorescence is of significant importance for its close relation with various applications such as fluorescence probes, laser devices, biomedical imaging, fluorescence detection, and so on. Therefore, researchers usually pay attention to the organic or inorganic substances in terms of their fluorescence enhancement methods [1, 2], resonance energy transfer during fluorescence emissions [3], fluorescence up-conversion spectroscopy [4], preventing dye molecules from aggregating so as to enhance fluorescence emission at higher dye concentrations by using solid mesostructured titanium dioxide (TiO2/P123) thin films [5], theoretical study of the low-lying electronic excited states for molecular aggregates molecular aggregates [6], and etc. Various fluorescence related detection methods or technologies have also been developed [1, 7, 8]. Concretely, using Nanoscaled ZnO films as enhanced substrates can efficiently enhance and detect fluorescence of dyes [1].
* Xianqiong Zhong [email protected]; [email protected]; [email protected] 1
College of Optoelectronic Engineering, Chengdu University of Information Technology, Chengdu 610225, Sichuan, China
Moreover, one can use two-photon excitation and timedomain instrumentation to measure fluorescence lifetime [7]. In a two-photon fluorescence resonance energy transfer system where CdTe quantum dots and Rhodamine B (RB) are respectively used as the donor and the acceptor, time resolved two-photon fluorescence and fluorescence lifetime measurements have been performed using the time-resolved fluorescence test system [8]. Besides, one knows that Rhodamine dyes
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