Photophysical Properties of Three-Dimensional Transition Metal Tris-Oxalate Network Structures

Persistent Spectral Hole-Burning in the R1 Line of Cr3+-Doped NaMg[Al(oxalate)3]·9(H2O/D2O) Induced by Resonant Energy Transfer

“…Repetitive resonant energy transfer thus results in the observed multiline pattern. The fact that the line resonant with the laser line carries only ∼15% of the total luminescence intensity indicates that the energy transfer rate constant is 5 to 10 times larger than the radiative decay rate constant of k r = 700 s −1 (τ r = 1.3 ms) …”

“…Thus, each photoinduced flip of a DHO molecules results in spectral hole-burning. 10 Excitation energy transfer or energy migration within the R 1 line of the 4 A 2 f 2 E transition of Cr 3+ has been observed in a series of chromium tris-oxalate compounds, [12][13][14] namely, in [Rh(bpy) 3 ][NaCr(ox) 3 ]ClO 4 (bpy ) 2,2′-bipyridine). In addition to the normally observed temperature-dependent phonon-assisted process, a resonant process between the zero-field split components of the 4 A 2 ground state has been identified.…”

Effect of External Pressure on the Excitation Energy Transfer from [Cr(ox)3]3− to [Cr(bpy)3]3+ in [Rh1−xCrx(bpy)3][NaM1−yCry(ox)3]ClO4

“…In Equation (1), I A and I D are the integrated acceptor and donor emission intensities, and intrinsic emission quantum efficiencies of both donor and acceptor of unity are assumed at 10 K. [13] At zero external pressure, the quantum efficiencies are 28 % for M = Al and 41 % for M = Rh. These values are in line with acceptor concentrations between 3 and 4 mole %.…”

Physical Chemistry at the University of Geneva

“…11). In addition to the well-known phonon-assisted process at elevated temperatures, two types of resonant and thus energy selective processes lead to a multi-line pattern and fast spectral diffusion, respectively, at 1.4 K. [28,29] In the complex [Ru(bpy) 2 dppz-TTF] 2+ (Fig. 12) irradiation into the metal-ligand charge transfer (MLCT) bands results in both luminescence as well as the creation of a comparatively long-lived charge separated state (τ = 2.4 µs).…”