Correlation between photophysical properties and lasing performances of Rhodamine-19 in three types of sol–gel glass hosts

Efficient lasing action from Rhodamine-110 (Rh-110) impregnated sol–gel silica samples prepared by dip method

“…In the present paper, as a continuation of our study on dye laser [24][25][26][27][28][29][30][31], we report the enhanced photophysical properties i.e. least possibility of aggregation (dimer formation) of Rh-110, efficient lasing action (166% laser efficiency) and photostability of Rh-110 impregnated sol-gel silica when pumped by nitrogen laser transversely.…”

“…The fluorescence spectra were scanned using an assembled fluorimeter with front surface excitation emission geometry [24][25][26][27][28][29][30][31]. Rh-110 in ethanol (basic) was used as the reference (in the order of 10 À 4 M/L) with fluorescence quantum yield (Q f ) equal to 0.90 [32] for the determination of the quantum yield.…”

“…The parallel sides of the sample themselves might be functioning as resonator (sample shape geometry was in the form of parralellopiped type with size 1.5 Â 0.5 Â 0.5 cm 3 approximately). The detection system consists of a 0.35 m Mc Pherson monochromator (plane holographic grating with 1200 G/mm) with resolution 0.05 nm and wavelength accuracy 0.2 nm, a UDT energy meter, and a plotter [24][25][26][27][28][29][30][31].…”

Fluorescence properties of dye doped mesoporous silica

“…[18][19][20][21][22][23][24] Starting from porous silica, the synthesis of organic-inorganic hybrids can be achieved by different methods: the post synthesis impregnation of the matrix or the introduction of dye molecules during the sol phase (pre-synthesis) [25][26][27]. Depending on the bond between the guest molecules and the host surface, the hybrids are divided into two categories: type I, where the bond is weak (van der Walls interaction or H-bond), and type II, where the bond is covalent.…”

“…If the host-guest bond is weak, the hybrids are classified as type I. However one can also choose a specific precursor of the molecules that lead to the formation of a covalent bond after chemical reaction, and the hybrids are classified as type II [25][26][27].…”