Optical and EPR properties of BaAl12O19:Eu2+, Mn2+ phosphor prepared by facile solution combustion approach

Optical and Piezoelectric Study of KNN Solid Solutions Co-Doped with La-Mn and Eu-Fe

“…In Figure 3b the spectrum shows only one broad signal, this response is related with the dipole–dipole interaction induced by the dopant concentration. This response is consistent with the presence of Mn 2+ ion, which, at lower symmetries, could present the fine structure transition between the ligand field split in levels, corresponding to 5/2–3/2, 3/2–1/2, 1/2–−1/2, −1/2–−3/2 and −3/2–−5/2 transitions [28]. Besides, at lower symmetries of Mn 4+ the fine structure is split in levels corresponding to 3/2–1/2, 1/2–−1/2 and −1/2–−3/2.…”

“…The difference between these two spectra is detailed as follows [27]. In Figure 3a, the spectrum is split in six lines due to the hyperfine interaction with the 55 Mn nucleus [27,28,29,30,31,32]. In Figure 3b the spectrum shows only one broad signal, this response is related with the dipole–dipole interaction induced by the dopant concentration.…”

“…Besides, at lower symmetries of Mn 4+ the fine structure is split in levels corresponding to 3/2–1/2, 1/2–−1/2 and −1/2–−3/2. However, as a result of large anisotropy only a central signal with its six hyperfine components due to Mn 2+ was observed and this signal can be overlapped by the response of Mn 4+ , being more sensitive for Mn 2+ [27,28,29,30,31,32,33,34,35]. …”

Novel ultra-high-temperature zero-thermal quenching plant-protecting type blue-green dual-emission KAl11O17:Eu2+,Mn2+ phosphors for urban ecological lighting

“…These particles were composed of several agglomerated crystals and crystal streaks, which exhibit similar microstructure to that reported for hexaaluminate. 26,27 EDS mapping (Fig. 1) shows that elements, such as K, Al, O, Eu, and Mn, are uniformly distributed in the prepared sample, and the proportion of each element is determined to be K (1.2) : Al (10) : Eu (1) : Mn (1), which may be because EDS can only analyze the surface.…”

Color tunable Ba0.79Al10.9O17.14:xEu phosphor prepared in air via valence state control

“…The third approach pumping blue, green, and red emitting phosphors with NUV LED deserves more attention because it displays extensive spectral distribution over the whole visible range to obtain high quality white light [1][2][3][4][5]. Hexagonal aluminates have good thermal and chemical stabilities, which are widely used as tricolor phosphor host materials [6,7]. The luminescence property of Eu 2+ and Ce 3+ doped BaAl 12 O 19 was firstly studied by Verstegen and Stevels [8] in 1974.…”