The visible fluorescence spectra of Er3+/GeO2/SiO2 and Er3+/Al2O3/GeO2/SiO2 optical fibers were measured. Two-photon absorption and excited-state-absorption of Er3+ ions are proposed to account for the experimental observation.
The absorption and fluorescence spectra of Tm: YAG crystals doped with Cr3+ and Er3+ sensitization ions have been studied. The average lifetime of 2E, 4I13/2, 3F4 levels of Cr3+, Er3+, Tm3+ ions, energy transfer efficiencies and rates have been calculated.
Cr3+→Tm3+ transfer efficiency is 80%, transfer rates is 2. 1 ×103s-1. The fluorescence spectrum of (Er, Tm): YAG crystal shows that Er3+→Tm3+ energy transfer is efficient one. It was discussed that the sensitization mechanisms are difference between Cr3+ to Tin3+ and Er3+ to Tm3+.
The UV-vis absorption and fluorescence spectra, thermal stability of spectral property, phase transition behavior and morphology of the synthesized polymers were investigated.
With increasing the length of the alkyl side chain, the UV and fluorescence spectra exhibit an obvious blue shift compared with those of the unsubstituted polymer.
Specific fluorescence peaks of chlorophyll forms in individual complexes have been determined from the absorption and fluorescence spectra of the chloroplast chlorophyll and their second derivatives at 23 and -196°C.
As greening proceeds, the 727-nm band in low-temperature fluorescence spectra (77 K) gradually shifts to longer wavelength (740-742 nm), which clearly demonstrates the light-driven biogenesis of LHC I and its assembly with CC I.
Concurrently, in the fluorescence spectra the emission maximum shifted from 508 to 575 nm.
The band shift from 740 to 720 nm in the low-temperature fluorescence spectrum (77 K) suggests a disturbance of energy transfer from LHC to the Chl a form at 710-712 nm.
The absorption and fluorescence spectra of dimethyloxyluciferin (DMOL) and monomethyloxyluciferin (MMOL) were studied at pH 3.0-12.0 In the range of pH 3.0-8.0, the fluorescence spectrum of DMOL exhibits a maximum at λem = 639 nm.
However, the fluorescence spectrum appears to be shifted, thus indicating the occurrence of an energy transfer process from Cr3+ to Nd3+ excited states, which is observed even at room temperature.
Addition of 7AAMD-caffeine complexes to DNA leads to a long-wavelength shift in the excitation spectrum and an increase in the fluorescence intensity along with a shift of the fluorescence spectrum to the short-wavelength area.
The resonance fluorescence spectrum of a Λ-system excited by two resonant light fields is calculated using a Markov analysis.
Study and application on fluorescent spectrum of the inclusion complex of β-cyclodextrin and medroxyprogesterone acetate
The inclusion complex reaction condition and the mechanism of β-cyclodextrin with hymecromone have been studied by fluorescent spectrum.
The fluorescent spectrum and collective effects in absorptive bistability
The fluorescent spectrum for absorptive bistability is calculated in the bad-cavity limit and found to be dominated by a component corresponding to single-atom resonance fluorescence in the net cavity field.
For steady-state resonance fluorescence, the ACF's carry information similar to that carried by the correlation function that yields the fluorescent spectrum.
Photoluminescence spectra suggest the enhanced separation of electron and hole pairs for the obtained composite titania film over the corresponding titania nanorod film.
The photoluminescence spectra of various fruits (apple, pear, kiwi, and strawberry) were measured in vivo using a number of fluorometric methods.
The photoluminescence spectra of sulfur-doped silica glass upon excitation into the absorption band at 203 nm and a temperature of 10 K are investigated.
The optical absorption edge and the photoluminescence spectra of amorphous hydrogenated diamond-like carbon (a-C:H) films are investigated in the temperature range 4.2-900 K.
Analysis of the photoluminescence spectra and the optical absorption edge of the a-Si:H films shows that the structures a-C:H/a-Si:H have a sharp interface and that charge carriers in the a-Si:H film undergo quantization.