Concentration quenching of laser dyes fluorescence in variety of solid matrices and liquid solutions

Two major reasons limit porphyrins photonic applications: (i) the difficulty of handling them in liquid solutions and (ii) their degradation with long exposure to light. This necessitates the use of appropriate solid matrices to host the porphyrin compounds such as Nafion (117), a stable and inert ion exchange polymer. The first part of this publication confirms such a possibility. In addition to their effective NLO properties, an enhancement of the Soret and Q-bands' absorbance width have been observed by blending three different porphyrin molecules in the Nafion column matrix membrane. This is an important development towards achieving efficient photon-harvesting medium for possible application in photonic devices. The second part of this contribution reports on the self-assembly/molecular recognition of a specific class of porphyrins giving rise to tubular nano-systems with potential THG nonlinear properties.

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Concentration quenching of the triplet state of Pd-tetraphenylchloride in liquid solutions

Journal of Applied Spectroscopy ◽

10.1007/bf00657381 ◽

1987 ◽

Vol 46 (5) ◽

pp. 519-522 ◽

Cited By ~ 2

Author(s):

V. V. Sapunov ◽

G. D. Egorova

Keyword(s):

Triplet State ◽

Concentration Quenching ◽

Liquid Solutions

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Improved Sol-Gel Materials for Efficient Solid State Dye Lasers

MRS Proceedings ◽

10.1557/proc-329-279 ◽

1993 ◽

Vol 329 ◽

Cited By ~ 3

Author(s):

Michael Canva ◽

Patrick Georges ◽

Jean-Fran^ois Perelgritz ◽

Alain Brun ◽

Fréddric Chaput ◽

...

Keyword(s):

Solid State ◽

Physical Properties ◽

Room Temperature ◽

Sol Gel ◽

Tunable Lasers ◽

Optical Quality ◽

Dye Lasers ◽

Laser Dyes ◽

Host Matrix ◽

Host Matrices

AbstractPhotoresistant laser dyes were trapped in silica based xerogel host matrices to obtain solid state tunable lasers. For this purpose very dense xerogel samples with improved chemical and physical properties were prepared at room temperature by the sol-gel technology. The as-prepared materials were polished to obtain optical quality surfaces and were used as new lasing media.Lasing action of such different dyes as rhodamine, perylene and pyrromethene doping dense sol-gel matrices was demonstrated. Efficiencies of 30 % or lifetimes of more than 100,000 shots were achieved with different new ≤dye dopant/host matrix≥ couples. Their different performances are reviewed and discussed.

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Luminescence Properties of Europium-Doped Yttrium Oxides Derived from Their Dodecylsulfate-Templated Mesostructure and Nanotube Forms

MRS Proceedings ◽

10.1557/proc-775-p3.2 ◽

2003 ◽

Vol 775 ◽

Cited By ~ 2

Author(s):

Tsuyoshi Kijima ◽

Kenichi Iwanaga ◽

Tomomi Hamasuna ◽

Shinji Mohri ◽

Mitsunori Yada ◽

...

Keyword(s):

Room Temperature ◽

Broad Band ◽

Concentration Quenching ◽

Precipitation Method ◽

Homogeneous Precipitation ◽

Bulk Materials ◽

Main Band ◽

Homogeneous Precipitation Method ◽

Order Of Magnitude ◽

Weak Luminescence

AbstractEuropium-doped hexagonal-mesostructured and nanotubular yttrium oxides templated by dodecylsulfate species as well as surfactant free bulk oxides were synthesized by the homogeneous precipitation method. All the as grown nanostructured or bulk materials with amorphous or poorly crystalline frameworks showed weak luminescence bands at room temperature. On calcination at 1000°C these materials were converted into highly crystalline yttrium oxides, resulting in a total increase in intensity of all the bands by one order of magnitude. In the hexagonal-mesostructured system, the main band due to the 5D0-7F2 transition for the calcined phases showed a sharp but asymmetrical multiplet splitting indicating multiple Eu sites. Concentration quenching was found at a Eu content of 3 mol% or above for these phases. In contrast, the main emission for the calcined solids in the nanotubular system occurred as poorly resolved broad band and the intensity of the main band at higher Eu content was significantly enhanced compared with those for the other two systems.

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