UV-IR spectra of new tellurite glasses

Impact of Stoichiometry on Structural and Optical Properties of Sputter Deposited Multicomponent Tellurite Glass Films

“…Previous reports on tellurite glasses assert that glass modifiers in TeO 2 ‐based glass deform the TeO 4 structural units into TeO 3 with lower coordination number . This deformation which easily occur along the axial‐equatorial bonding of TeO 4 changes the Te ax –O eq –Te angle along the c‐axis causing creation of defects, oxygen vacancies, and increases non‐bridging oxygen concentration, which is also confirmed by our Raman measurements to be discussed in the next section . Oxygen vacancies result in creation of cation–cation bonds such as Te–Te and low coordinated Te …”

A comprehensive phononics of phonon assisted energy transfer in the Yb3+ aided upconversion luminescence of Tm3+ and Ho3+ in solids

“…4a and b). The result indicates that the incorporated Yb 3 þ , Tm 3 þ and Ho 3 þ ions in the glass occupy a position similar to that of La 3 þ and face similar electrostatic interactions from the surrounding nonbridging oxygens [19,20]. Under such a condition, it is most likely that the Te-O À stretching vibration states of the neighboring non-bridging oxygens remain coupled with the electronic states of the incorporated Yb 3 þ , Ho 3 þ , and Tm 3 þ ions of the respective glasses.…”

“…In the case of a high barium tellurite glass (4 15 mol%), the modifier Ba 2 þ ion is known [17,18] to remain in a state of strong electrostatic interaction with the nearest Te-O À non-bridging oxygens of the glass because of its large ionic size. Since Ba 2 þ and La 3 þ have similar ionic sizes and La 3 þ like Ba 2 þ acts as a modifier cation in a tellurite glass, La 3 þ ion in this glass should also experience strong electrostatic interaction [19,20] with the nearest Te-O À non-bridging oxygens. On substituting La 3 þ either with Yb 3 þ , Tm 3 þ or Ho 3 þ the FTIR spectra of the glasses remain more or less the same (Fig.…”

Thermal, structural, optical, and photon shielding studies of cerium‐doped barium tellurite glasses

“…The amorphous nature of prepared glasses can also be confirmed by the absence of any sharp absorption edge. [ 10,31,32 ] The optical bandgap ( E opt ) has been obtained using Mott and Davis's theory. This theory suggests the relationship between photon energy ( ) and optical absorption coefficient ( ) is given by [ 33 ] : where A is constant, and the values of depend on the interband transitions as =1/2 and 2 for allowed direct and indirect transitions, respectively.…”

“…The amorphous nature of prepared glasses can also be confirmed by the absence of any sharp absorption edge. [10,31,32] The optical bandgap (E opt ) has been obtained using Mott and Davis's theory. This theory suggests the relationship between photon energy (ℏν) and optical absorption coefficient (α ν ð Þ) is given by [33] :…”