Nonstoichiometry in the Rare-Earth Aluminum Borates

Abstract

Optical spectroscopy on one of a series (the europium compound) of the rare-earth aluminium borates indicates appreciable nonstoichiometry, confirmed by further x-ray studies. Detailed studies as a function of magnetic field and temperature of a particular transition (7F0—5D1) indicate that not only the Al3+ site but also other sites are being occupied by the rare-earth ions. Crystal-field splittings in 5D1 and 7F1 agree well with Judd's calculations, confirming the assignment of levels.

Synthesis and photoluminescence properties of Sm3+‐doped YAl3(BO3)4phosphor

“…In YAl (3-y) (BO 3 ) 4 :Sm y 3+ phosphor, the samarium ions tend to occupy both Y 3+ as well as Al 3+ -deficient sites to maintain the charge neutrality. For charge compensation, the presence of non-regular sites for lanthanides in borate compounds was reported by Leask et al (30). Consequently, the distance between the Sm 3+ ions and neighborhood oxygen atoms gets closer, as the size of the Al 3+ lattice site is smaller than that of Sm 3+ and Y 3+ ions.…”

Stacking Sequences of Coherent EuAl3(BO3)4 Polymorphs Define Local Eu3+ Symmetry and Control Access to Quantum Information Storage

“…Photoluminescence spectroscopy can resolve crystal field splits due to the Eu 3+ site symmetry. For the three EuAl 3 (BO 3 ) 4 polymorphs, the Eu 3+ site symmetries are D 3 for R 32, C 1 and C 2 for C 2, and C 2 for C 2/ c . For the trigonal point group D 3 , two levels are expected, and for the monoclinic C 2 and triclinic C 1 , three levels .…”

Growth of ErAl3(BO3)4 Single Crystals from a K2Mo3O10 Flux

“…Rare-earth aluminum borate crystals (RAl 3 (BO 3 ) 4 ; R = Y, La−Lu) have attracted much attention, due to their potential applications in various industrial fields because of their excellent optical properties. − These RAl 3 (BO 3 ) 4 crystals are of great interest for their luminescence and very low concentration quenching. Nowadays, there is a persistent demand for optical devices, such as self-frequency-doubling lasers and laser diode pumps. ,,, Among these RAl 3 (BO 3 ) 4 crystals, YAl 3 (BO 3 ) 4 is well-known to be a nonlinear crystal and is an excellent host for rare-earth ions such as Nd 3+ , Yb 3+ , and Er 3+ .…”

“…YAl 3 (BO 3 ) 4 doped with rare-earth ions and NdAl 3 (BO 3 ) 4 crystals have been frequently studied over the last few decades. There have been only a few reports on the crystal growth of Er-stoichiometric ErAl 3 (BO 3 ) 4 and its properties; however, detailed results such as the optimal growth conditions and crystal properties have not been described. ,, In this paper, our main aim is to find out the reproducible optimum growth conditions of ErAl 3 (BO 3 ) 4 crystals by slow cooling from a K 2 Mo 3 O 10 flux. In addition, the morphology of the resulting crystals was also examined.…”

“…Rare-earth aluminum borate crystals (RAl 3 (BO 3 ) 4 ; R ) Y, La-Lu) have attracted much attention, due to their potential applications in various industrial fields because of their excellent optical properties. [1][2][3][4][5][6][7][8][9][10][11][12][13][14][15][16][17][18][19][20] These RAl 3 (BO 3 ) 4 crystals are of great interest for their luminescence and very low concentration quenching. Nowadays, there is a persistent demand for optical devices, such as self-frequency-doubling lasers and laser diode pumps.…”