Theory of interconfigurational nonradiative transitions in transition-metal ions in solids and application to theTi3+:Al

Optical properties of Ni-doped MgGa2O4 single crystals grown by floating zone method

“…The estimated Z r of 0.143 at% Ni-doped MgGa 2 O 4 of 82% is similar to the 83% of Ti 3þ : Al 2 O 3 [14,15]. The directly measured quantum efficiency (Z QE ) of the emission at 300 K was 5674 and 3172% for 0.143 and 1.43 at% Ni-doped MgGa 2 O 4 single crystal, respectively.…”

The effect of pressure on luminescence properties of Cr3+ ions in LiSc(WO4)2 crystals—Part I: Pressure dependent emission lineshape

“…Since the G 8 ( 4 A 2 ) ground state is energetically well separated, its coupling with the excited states is neglected in our present approach. To perform calculations we have used the diabatic approximation [39,40], where vibronic states related to each electronic manifold are represented by the following Born-Oppenhaimer functions:…”

The effect of pressure on luminescence properties of Cr3+ ions in LiSc(WO4)2 crystals—Part II: Pressure- and temperature-dependent luminescence kinetics

“…Since the decrease in the luminescence lifetime is accompanied by a decrease in the emission intensity, we attribute this effect to enhanced non-radiative transitions due to the 4 T 2 -4 A 2 internal conversion [7]. The decrease in the effective or total lifetime can be described by…”

“…(1) to fit the data presented in D nr and coefficient a: While fitting, the radiative decay constant t r was taken as the effective lifetime at 20 K and fixed. Coefficient a has also been fixed since the probability of non-radiative transition has been assumed to be p nr ¼ 10 12 s À1 (one can find a detailed discussion of non-radiative processes in transition metal ions in solids in paper [7]). Thus, only the quantity of barrier height has been adjusted and the fitting results are listed in Table 1.…”