Sm2+ fluorescence and absorption in cubic BaCl2: Strong thermal crossover of fluorescence between 4f6 and 4f55d1 configurations

Crystal growth of La3+-substituted BaCl2 by the micro-pulling-down technique and their luminescence properties

“…A wide excitation band and Eu 2+ emission band at 400 nm for both (c) and (d) were observed in (III), as reported in a previous study [1]. The emission band at approximately 400 nm was assigned to Eu 2+ (4f 6 )(5d 1 2 D 5/2, 7/2 ) → (4f 7 8 S 7/2 ) transitions that are typical Eu 2+ broad peaks [9,12]. However, unidentified weak peaks appeared at approximately 450 nm.…”

“…There might be possibilities that BaCl 2 absorb moisture from the air when measuring XRD peaks. Cubic phase peaks were not identified from these patterns, as reported [9][10][11][12]. In addition, hexagonal BaCl 2 peaks were not seen at room temperature.…”

“…On the other hand, Eu 2+ -activated BaCl 2 shows a typical Eu 2+ 5d-4f spin forbidden transition and a parity allowed transition around 400 nm. This band was also assigned to two transitions (5d 1 2 D 5/2, 7/2 )(t 2g and e g ) → (4f 7 8 S 7/2 ) [9,12] and is considered extrinsic. Moreover, an unidentified weak peak was observed at approximately 450 nm, as observed in the PL spectra in Fig.…”

“…was fabricated by substituting nominal 10-12.5 at% La at Ba sites, heating up the starting materials to above the melting point [9][10][11][12], and a special cooling program to room temperature [9][10][11][12]. Through these processes, the cubic phase (high temperature phase) was maintained at room temperature [9][10][11][12]. However, the actual La concentration required to maintain the cubic structure was not measured using energy-dispersive X-ray spectroscopy (EDX) and/or wavelength-dispersive X-ray spectroscopy [9].…”

Samarium‐Doped Oxyfluoride Glass‐Ceramic as a New Fast Erasable Dosimetric Detector Material for Microbeam Radiation Cancer Therapy Applications at the Canadian Synchrotron

“…The aim of this work was the synthesis, characterization, and dosimetric testing of an oxyfluoride glass‐ceramic containing CaF 2 :Sm 3+ nanocrystals as a new potential dosimeter material to be used for MRT applications. It should be emphasized that Sm‐doped glasses and glass‐ceramics in this work are not necessarily limited to applications in MRT, inasmuch as Sm‐doped materials have, in recent years, been widely studied for a variety of optoelectronic applications such as X‐ray imaging phosphors, optical waveguides, three‐dimensional optical memories, pressure sensors, white LEDs, and solar cells …”