Effect of hydroxyl groups on Er3+-doped bismuth-borate glass and fiber

Role of Al coordination in barium phosphate glasses on the emission features of Ho3+ ion in the visible and IR spectral ranges

“…However, a reversal trend of these bands is observed when the concentration of Al 2 O 3 is raised from 3.0 to 4.0 mol%. Additionally, the spectra of these glasses have also exhibited the bands due to stretching vibration of OH À groups at about 3720 (identified due to free OH À groups), 2374 and 2345 cm À 1 (identified due to strongly hydrogen-bonded OH À groups) [27]. With increase in the concentration of Al 2 O 3 , the bands appeared to become gradually narrowed; this observation indicates that the vibration absorption of OH À groups is gradually getting weakened with increase in the concentration of Al 2 O 3 .…”

“…The OH À groups in the glass are associated through hydrogen bonding with the network former cations viz., aluminium and phosphorous. For the free OH À groups, the distance between OH À and another O ion is quite long, whereas the distance between the strongly hydrogenbonded OH À and another O ion is much short [46,47,27]. The shorter the distance, the stronger will be the strength of the association.…”

Role of MnO in manganese–borate binary glass systems: a study on structure and thermal properties

“…Borate glasses doped with alkali metals are useful in UV range optics owing to their high transparency. Moreover, such glasses possess specific properties for use in sensors and glass fibres [2,3]. Introduction of magnetically active elements gives the possibility of applications in spintronics and magneto-optics [4,5].…”