Energy transfer from rhodamine 6G to thionine in an anionic microemulsion

Mackay, Raymond A.; Lai, Wen-Chao

doi:10.1016/j.colsurfa.2004.04.062

Cited by 5 publications

(3 citation statements)

References 32 publications

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“…Fluorescence lifetimes were measured using a time-correlated single photon counting (TCSPC) technique (Horiba Jobin Yvon), with a pulsed laser diode as excitation source at 560 nm (NanoLed, Horiba) and a pulse rate of 1 MHz in a 90° arrangement to a TBX-4 detector. The detector was set to 636 nm, and the aperture of the band-pass was set to its maximum value (24.9 nm) due to the well-known weak fluorescence intensity of thionine samples. , The instrument was set in the Reverse TAC mode, where the first detected photon represented the start signal for the time-to-amplitude converter (TAC), and the excitation pulse triggered the stop signal. DAS6 decay analysis software was used for lifetime calculation.…”

Section: Methodsmentioning

confidence: 99%

“…The detector was set to 636 nm, and the aperture of the band-pass was set to its maximum value (24.9 nm) due to the well-known weak fluorescence intensity of thionine samples. 45,46 The instrument was set in the Reverse TAC mode, where the first detected photon represented the start signal for the time-to-amplitude converter (TAC), and the excitation pulse triggered the stop signal. DAS6 decay analysis software was used for lifetime calculation.…”

Section: Introductionmentioning

confidence: 99%

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Thionine Dye Confined in Zeolite L: Synthesis Location and Optical Properties

et al. 2015

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The process of light conversion is at present deeply investigated to develop more efficient devices for artificial photosynthesis, water splitting, photovoltaic applications, and targeting therapeutic agents. This process is induced by nanostructured functional materials, such as zeolites light sensitized by dye molecules adsorbed into their pores. Here a detailed study of the organization of the cationic dye thionine (Th) inserted into the linear 12MR channels of zeolite L is carried out by XRPD, FT-IR spectroscopyfor the determination of the host−guest interactionsand UV−vis absorption and photoluminescence spectroscopies for the investigation of the electronic states of the guest. Two composites with different Th loading (labeled ZL/0.15Th and ZL/0.27Th) were obtained through ion exchange. TGA spectra and IR-ATR spectroscopy clearly indicated penetration of Th molecules into the ZL channels. Rietveld structural refinement showed that Th molecules in both composites are aligned parallel to the 12MR channel axis and located on the mirror planes parallel to the c-axis. Water molecules interact strongly with the dye and form a kind of solvent−matrix tube shaped around the Th molecule, favoring the upright arrangement of the molecules. DR−UV−vis spectra of the ZL/Th composites indicated that Th molecules are hosted in the ZL channels in a monomeric form. Photoluminescence spectroscopy demonstrated that photoluminescent dyes correspond to ca. 5% of the total amount of Th molecules in the zeolite porosities. While most of the photoluminescent Th molecules exhibit a lifetime equivalent to Th in solutions, the complementary fraction of photoluminescent Th exhibit significantly longer lifetimes, resulting from an entrapment in defects of the zeolite structure, inducing strong rotational constraints to the molecules.

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Section: Methodsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Thionine Dye Confined in Zeolite L: Synthesis Location and Optical Properties

et al. 2015

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“…limitation, we combine multiple dyes in a single laser to extend the emission to near-infrared wavelengths and achieve multi-wavelength random laser operation through energy transfer. E cient energy transfer between two dyes occurs when their spectral pro les overlap effectively [3,4]. When the donor dye is excited, it transfers its excitation energy to the acceptor dye through a non-radiative process.…”

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confidence: 99%

Tuning Multi-wavelength Lasing in Rhodamine 640/Methylene Blue/Ag NWs Random Lasers

Jassim,

al-samak,

Ejbarah

et al. 2023

Preprint

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This research investigates a type of random laser with coherent properties, designed and studied to understand how fluorescence resonance energy transfer affects the emission spectra and threshold of Rhodamine 640/methylene blue/Ag NWs lasers. We demonstrate that Rhodamine 640 enhances the laser output of methylene blue beyond 700 nm. Additionally, by adjusting the mixing ratio of the two dyes, we achieved multi-wavelength lasing with linewidths as narrow as 1 nm. Ag NWs serve as scatterers in this system, both enhancing light extraction efficiency in the visible range and lowering the operating threshold for multi-wavelength lasing.

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