Solid state luminescence spectrum

Therefore, this low-energy band is assigned to a metal-centered d->p transition instead of as arising from Au---Au interactions. The solid-state luminescence spectrum (Fig. 25) exhibits a phosphorescence emission band centered at 417 nm. This value compares favorably with those reported for solids K[Au(CN)2]58 and Au2(dmb)(CN)2.63... 

In line with the variation of the Cu Cu interaction in function of the temperature, the emission maximum in the solid-state luminescence spectrum (Nxcit = 350 nm) of 47 appears considerably red shifted when the temperature is decreased from 298 K (538 nm) to 77 K (599 nm). The red shift is less pronounced in the case of compound 47" Figure 53 reveals that the low-temperature spectrum is somewhat less broadened than that recorded at room temperature. 

The electroluminescence spectra of the single-layer devices are depicted in Figure 16-40. For all these OPV5s, EL spectra coincided with the solid-state photoluminescence spectra, indicating that the same excited states are involved in both PL and EL. The broad luminescence spectrum for Ooct-OPV5-CN" is attributed to excimer emission (Section 16.3.1.4). 

Poly(2,5-pyridyl) commonly know as poly(pyridine) has been the subject of considerable research effort as it luminesces in the blue region of the spectrum and may have uses in light emitting diodes (LEDs). Vaschetto and co-workers [103] reported a series of calculations on the molecule and its oligomers. The calculations included both the B3LYP and B3P88 density functions, Hartree-Fock calculations and a periodic solid-state DFT calculation using linear muffin tintype orbitals (LMTO). 

Complexes containing the 3,5-dinitrosalicylate ion, e.g. [Ln2(C2H202N2)3],- H20 (u = 7 -> 15), and methylsalicylate (MesaP ), e.g. [Ln(Mesal)2(OH)-(H2O)] (Ln = La, Pr, Nd, Sm, Gd, Dy, Er, Yb and have been reported. Tris-salicylaldehydato (said ) complexes, Ln(sald)3 (La, Pr, Nd, Sm, Eu, or Tb) form 1 1 adducts with o-phenanthroline (o-phen), aa -bipyridyl, quinoline, and pyridine. The luminescence spectrum of the Eu " complexes showed that, in the solid state, the symmetrically forbidden electric dipole transition intensity was much enhanced for the o-phen adduct when compared to its salicylate analogue. The simple said" complexes were very poor emitters. 

These materials were luminescent in the solid state, exhibiting white luminescence that became brilliant at 77 K. For example, the room temperature emission spectrum of the methyl derivative revealed, as expected from the previous comments, one emission band at 422 nm, but at 77 three emission bands were detected at 415,456 and 560 nm, with the first two being much more intense. The time-resolved measure-... 

As regards the optical properties of this complex, the absorption spectrum in chloroform solution revealed absorption maxima at 290 (e = 2.5 x 103) and 204 nm (e = 7.7 x 103). These values were similar to those found in [Au3(CH3N=COCH3)3] and were likely due to metal-to-ligand charge transfer. It was luminescent at room temperature in the solid state showing an intense band at 404 nm and shoulders at 525 and 793 nm, the third with a very low intensity. The complexity of this pattern was... 

The complex is luminescent in the solid state and in solution in pyridine. The absorption spectrum shows a maximum at 340 nm and the emission spectrum displays a band at 425 nm. The crystals are also luminescent, but the excitation and emission spectra appear at different wavelengths. Thus, the complex emits at 490 nm and the excitation spectrum is complicated, with bands in a wide range from 300 to 450 nm. This result suggests that different species are responsible for luminescence in the solid state and in solution, with the isolated trinuclear complex being the emitting species in solution, while the luminescent properties of the crystal are the result of the extended supramolecular aggregation in the solid. As before, the complex did not exhibit solvoluminescence. 

Certain compounds, whether present in solution or in solid state (as molecular or ionic crystals) emit light when they are excited by photons in the visible or near ultraviolet domain of the spectrum. This phenomenon, called luminescence, is the basis of fluorimetry, a very selective and sensitive analysis technique. The corresponding measurements are made with fluorimeters or spectrofluorimeters and, for chromatographic applications, with fluorescence detectors. 

The laser emission peak from R6G doped ORMOSIL gels occurred at 571 nm with a bandwidth of 4 nm. The laser emisison band is narrower than the FWHM fluorescence band. The doped ORMOSIL sample exhibited a luminescence peak at 565 nm with a bandwidth of 55 nm (FWHM) In contrast to the C153 gel, the solid state rhodamine doped sample did not oscillate over the FWHM range of die fluorescence emission spectrum. The R6G samples exhibited detectable oscillation over a total range of about 38 nm (559 to 587 nm). 

It is not surprising that the emission spectrum of 14 resembles that of 11. After excitation at 360 nm, it displays two emission maxima of medium intensity at 414 and 435 nm. In contrast, material 15 is strongly luminescent. In the solid state after excitation at 360 nm, it displays a broad featureless emission with max at about 550 nm (Fig. 23). 

Both polymers 18 and 20 are luminescent in the solid state. In the case of compound 18, the shape of the emission spectrum depends from excitation wavelength. Upon excitation at 320 nm, a broad featureless emission is observed at 530 nm. After excitation at 380 nm, the emission spectrum exhibits a sharp maximum at 429 and a broad hump centered at 520 nm (Fig. 36). Three maxima at 422, 505, and 542 nm are found in the emission spectrum of [(CuI)2 p-o-TolS(CH2)4STol-o 2]ra 20 (Fig. 37b) after excitation at 360 nm. The resemblance of the band at 422 nm with the emission band of solid l,4-bis(o-tolylthio)butane (Figure 37b) indicates that this emission is essentially... 

The photoluminescent behavior of a complex of the type Zn(diimine)(dtsq), where diimine = 2,2 -biquinoline, phen (44), or 4,7-diphenyl-2,9-dimethyl-phen (batho) and dtsq = dithiosquarate, have been reported by Gronlund et al (135). The phen and batho complexes display broad, featureless luminescence spectra in the solid state at room temperature. Upon cooling to 77 K, the emission spectrum of Zn(batho)(dtsq) resolves into three sharp peaks overlapping the broad emission feature these sharp peaks are assigned to a diimine localized ji-ji emission. The Zn(diimine)(dithiolate) solids degrade upon UV laser excitation, which has inhibited accurate lifetime measurements. 

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