Crystal structure, photoluminescence and cathodoluminescence of Sr_1-xCa_xAl₂O₄ doped with Eu²⁺

Crystal structure, photoluminescence and cathodoluminescence of Ba1-xCaxAl2O4 doped with Eu2+

“…1 as red dots, we found only C 3 A and C 12 A 7 . In the BCA series without an Al 2 O 3 excess we did not find C 2 A (grossite), which was found as a relatively large phase in the system CSA, described in [1]. The cell dimensions of the aluminates with one alkaline earth ion agree well with the data published in the literature [6,[10][11][12].…”

“…The decision on the firing temperature was made after evaluating electron microscope images and photo luminescence (PL) spectra of samples. The electron microscopes including the Gatan spectrometer for recording CL spectra with the transmission electron microscope (TEM), the XRD-equipment and the spectrometer for PL have been described in [1].…”

“…We have described in detail the three sites for the alkaline earth cations in the monoclinic BCA phase (i.e. monoclinic CaAl 2 O 4 with space group P2 1 /n) in [1] and also the two sites in hexagonal BSA (P6 3 ) [2]. The paraelectric BA phase (P6 3 22) has only one Ba site; we have used this well-known fact in analyzing the PL spectra, to be discussed in the next section.…”

“…This article is the third part of a study of alkaline earth (Ca, Sr or Ba) aluminates doped with Eu 2+ . In the first parts [1,2] we have described the crystal structure, photoluminescence (PL) and cathodoluminescence (CL) spectra of Sr 1−x Ca x Al 2 O 4 and Sr 1−x Ba x Al 2 O 4 respectively; herein we shall describe the phosphor system Ba 1−x Ca x Al 2 O 4 doped with 3 mol% Eu 2+ . For the introduction on the luminescence of alkaline earth aluminates doped with Eu 2+ we refer the reader to [1] and the literature mentioned therein.…”

“…In the first parts [1,2] we have described the crystal structure, photoluminescence (PL) and cathodoluminescence (CL) spectra of Sr 1−x Ca x Al 2 O 4 and Sr 1−x Ba x Al 2 O 4 respectively; herein we shall describe the phosphor system Ba 1−x Ca x Al 2 O 4 doped with 3 mol% Eu 2+ . For the introduction on the luminescence of alkaline earth aluminates doped with Eu 2+ we refer the reader to [1] and the literature mentioned therein. Figure 1 presents the composition diagram of the ternary system BaO-CaO-Al 2 O 3 , based on the data presented in Shuklás thesis [3], the literature mentioned therein and the work of Ptáček [4] and Ropp [5].…”