Ions In Tellurite Glasses Research Articles

The effect of Er3+-ion concentration on the Er3+ : 4I13/2 → 4I15/2 transition in tellurite glasses

The effect of Er3+ concentration on the Er3+ : 4I13/2 → 4I15/2 emission in tellurite glasses has been investigated. The full width at half-maximum increased with the increasing concentration of Er2O3 in tellurite glasses. The effect of local structure of Er3+ ions and related spectroscopic changes are taken into account to explain the line broadening. Inhomogeneous broadening due to the distribution of crystal field around the Er3+ ion has little effect on the absorption spectra. Highly efficient energy trapping between the ions was identified from the time-resolved analysis of the fluorescence decay and is found to be responsible for the extended lifetime at intermediate concentrations of Er3+ ions in tellurite glasses. The effect of temperature on spectral line shape has been determined for analysing the contribution of Boltzmann population on line broadening. The increased population of the overlying Stark sublevels at the 4I13/2 energy level via direct pumping and/or interaction between Er3+ ions were also found to be significant for enhancement in spectral line shape at higher concentrations of Er3+ ions in tellurite glasses. It was observed that at higher concentrations of Er3+ ions in glass also enhance the local symmetry of ions, which is apparent from the absorption band of the Er3+ : 4I15/2 → 2H11/2 hypersensitive transition.

Study of luminescence properties of Er3+-ions in new tellurite glasses

Abstract The effects of concentration of Er3+ ions in tellurite glasses on the decay time, spectral width and weighted spectral peak are studied. A broad emission spectrum of width 121 nm peaked at wavelength of 1.5 μm is obtained in 2.5 mol% Er doped glasses. The maximum decay time of 4I13/2 → 4I15/2 transition (at wavelength 1.5 μm) is about 4.5 ms for 1.0 mol% Er doped glasses. Strong green and red upconversion emission at emission 550 nm (4S3/2 → 4I15/2) and 670 nm (4F9/2 → 4I15/2) are observed from Er3+-doped tellurite glasses upon continuous wave excitation at 975 nm. It is found that the upconversion efficiency goes up with the increasing concentration of the Er3+ ions.

Red–green–blue upconversion emission and energy-transfer between Tm3+ and Er3+ ions in tellurite glasses excited at 1.064 μm

Red, green, and blue emission through frequency upconversion and energy-transfer processes in tellurite glasses doped with Tm3+ and Er3+ excited at 1.064μm is investigated. The Tm3+/Er3+-codoped samples produced intense upconversion emission signals at around 480, 530, 550 and 660nm. The 480nm blue emission was originated from the 1G4→3H6 transition of the Tm3+ ions excited by a multiphoton stepwise phonon-assisted excited-state absorption process. The 530, 550nm green and 660nm red upconversion luminescences were identified as originating from the 2H11/2, 4S3/2→4I15/2 and 4F9/2→4I15/2 transitions of the Er3+ ions, respectively, populated via efficient cross-relaxation processes and excited-state absorption. White light generation employing a single infrared excitation source is also examined.

Characteristic Features of Photoluminescence of the Opal–Tellurite Glass–Er 3+ Nanocomposite

We carried out a comparative investigation of the photoluminescence of Er3+ ions in tellurite glasses on melted quartz substrates and when introduced into the matrices of artificial opal. We have discovered an increase in the photoluminescence of the opal–tellurite glass–Er3+ nanocomposite in comparison with the specimens of the same glass on melted quartz substrates.