Lattice dynamics of Bi3TeBO9 microcrystals: μ-Raman/IR spectroscopic investigation and ab initio analysis

Efficient near-infrared quantum cutting by cooperative energy transfer in Bi3TeBO9:Nd3+ phosphors

“…Moreover, the BO 3 and TeO 6 groups are arranged similarly along the x and y axis, creating the alternate rows of BO 3 and TeO 6 groups (Fig. 1) [10,13]. The structure of BTBO crystal presented in Fig.…”

“…1b, the structure projection according to the xyz orientation with some planar BO 3 groups and TeO 6 octahedra is presented. Moreover, we have already presented the detailed description of BTBO structure in our previous paper [13].…”

“…The phonon modes of A, E 1 and E 2 types are Raman active, whereas the modes of A and E 1 species are IR active. The modes of B symmetry are inactive both in the Raman and IR spectra [13,29,30]. The BTBO structure is formed by octahedral TeO 6 and trigonalplanar BO 3 molecular groups, which have their own characteristic internal vibrations.…”

“…The synthesis, crystal structure, electronic structure, some optical and spectroscopic properties of undoped BTBO were already reported [9][10][11][12]. Recently, the first complex study of vibrational properties based on experimental results of IR and Raman spectroscopy supported by the ab initio calculations for undoped BTBO microcrystalline powders were reported by us [13].…”

“…In the BTBO structure, Bi 3? ions occur in octahedral coordination BiO 6 being six-coordinated by the oxygen atoms forming BiO 6 octahedra [13]. Due to the close location of some excited states of Bi 3?…”