Luminescent schematic representation

Fig. 5 Schematic representation of the electronic transitions during luminescence phenomena [5]. — A absorbed energy, F fluorescence emission, P phosphorescence, S ground state. S excited singlet state, T forbidden triplet transition.

Fig. 2 Schematic representation of (a) a luminescent dendritic sensor with signal amplification and (b) a conventional luminescent sensor. The curved arrows represent interaction processes which changes the luminescence properties (from empty to filled circles). Analyte is represented by a solid hexagon, while the recognition site is by an empty hexagon...

Fig.8.1. Schematic representation of iuminescent sorter 1-funnei 2-vibrational feeder 3-frame 4-conveyer for concentrate 5-conveyer for waste 6-luminescence excitation source 7-collecting optics 8-optical filter 9-detector 10-air valve (Moskrousov and Lileev 1979)... 

Figure 2. Schematic representation of some relevant ground and excited-state properties of Ru(bpy)j. MLCT and MLCT are the spin-allowed and spin-forbidden metal-to-ligand charge transfer excited states, responsible for the high intensity absorption band with = 450 nm and the luminescence band with = 615 nm, respectively. The other quantities shown are intersystem crossing efficiency energy (E°°) and lifetime (x) of the MLCT state luminescence quantum yield ( ) quantum yield for ligand detachment (O,). The reduction potentials of couples involving the ground and the MLCT excited states are also indicated.

Figure 9. (a) Schematic representation of the five-module format of a photoactive triad which is switchable only by the simultaneous presence of a pair of ions. This design involves the multiple application of the ideas in Figure 1. The four distinct situations are shown. Note that the presence of each guest ion in its selective receptor only suppresses that particular electron transfer path. The mutually exclusive selectivity of each receptor is symbolized by the different hole sizes. All electron transfer activity ceases when both guest ions have been received by the appropriate receptors. The case is an AND logic gate at the molecular scale. While this uses only two ionic inputs, the principle established here should be extensible to accommodate three inputs or more, (b) An example illustrating the principles of part (a) from an extension of the aminomethyl aromatic family. The case shown applies to the situation (iv) in part (a) where both receptors are occupied. It is only then that luminescence is switched "on". Protons and sodium ions are the relevant ionic inputs.

Fig. 30. Schematic representation of a photo-electroswitch where the emission properties of a photosensitive centre are modulated by the electrochemical interconversion of a redox centre inducing luminescence quenching by energy or electron transfer.

Fig. 6 Schematic representation of a time-resolved measurement of pC>2. Oxygen quenches the luminescence of the sensor probe and decreases its decay time r [33]...

Fig. 9 Schematic representation of the time-domain DLR (f-DLR) scheme. The shortlived indicator fluorescence and the long-lived phosphorescence of the inert reference beads are simultaneously excited and measured in two time gates. The first (Aex) is in the excitation period where the light source is on and the signal obtained is composed of short-lived fluorescence and long-lived luminescence. The second gate (Aem) is opened in the emission period where the intensity is exclusively composed of the reference luminescence [18]...

Fig.1 Schematic representation of photoredox switching Luminescence quenched in the oxidized state of R (Rox).

The schematic representation of A-STE and M-STE and luminescence transitions in neutral centers is shown in Fig.2a. In M-STE the configuration co-ordinate, QM, is an intemuclear distance of the molecule (Fig.2b). In A-STE (Fig.2c), the configuration co-ordinate, QA, is a radius of microcavity (nearest-neighbor distance) [7]. 

Fig. 15. (a) Schematic Er excitation model, showing the electronic band structure of Si nanocrystall-doped Si02 and the Er 4f energy levels. An optically generated exciton (dotted line) confined in the nanocrystal can recombine and excite Er3+. (b) Schematic representation of SiC>2 containing Er (crosses) and nanocrystals (circles). The nanocrystals that couple to Er (filled circles) show no exciton luminescence (redraw after (Kik and Polman, 2001)). 

Fig. 5. Schematic representation of the sensitization process of lanthanide luminescence via the surroundings of the...

Fig. 2. Schematic representation of the mechanism of photostimulated luminescence in BaBrF Eu. (A) Formation of a colour centre (F) under X-ray irradiation by trapping of an electron in a bromine vacancy with trapping of the hole formed in the valence band by a hole trapping centre (HT) in the vicinity (B) Release of the trapped electron by laser irradiation and transfer of the electron-hole recombination energy to Eu2+. Relaxations after electron transfers have not been represented.

Fig. 2. Schematic representation of a luminescent probe (P ) in micellar and aqueous environments...

Figure 13 Schematic representation of the mechanism of the green luminescence ofZnS Cu,Al...

Figure 13.15 Schematic representation of synthesis and surface modification of nanoparticles [54]. (Reproduced with permission from W.J. Rieter et al., Surface modification and functionalization of nanoscale metal-organic frameworks for controlled release and luminescence sensing, Journal of the American Chemical Society, 129, 9852-9853, 2007. 2007 American Chemical Society.)...

Fig. 30. Schematic representation of luminescence quenching by electron transfer.

Pig. 40. Schematic representation of luminescent centers. Eir, electron-lattice relaxation J, band broadening. See also text. 

Figure 2.18 Schematic representation of photophysical processes in lanthanide(III) complexes (antenna effect). A = absorption, F = fluorescence, P = phosphorescence, L = lanthanide-centred luminescence, ISC = intersystem crossing, ET = energy transfer S = singlet, T = triplet. Full vertical lines radiative transitions dotted vertical lines nonradiative transitions...

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