Luminescence and photometric activity of an intense green emitting ZnBiBaBFTe:Tb3+ glasses. (July 2023)

• Record Type: Journal Article
• Authors: Sumalatha, C.; Doddoji, Ramachari; Venkateswarlu, M.; Swapna, K.; Mahamuda, Sk; Rao, A.S.
• Is Part Of: Radiation physics and chemistry. Volume 208(2023)
• Publication Date: 2023-07
• Subjects: Tb3+-doped glasses -- DTA -- Absorption -- Photoluminescence -- Decay curves -- Green light emission; Radiation chemistry -- Periodicals; Radiometry -- Periodicals; Radiation -- Periodicals; Chimie sous rayonnement -- Périodiques; 539.2
• DOI: 10.1016/j.radphyschem.2023.110894
• Languages: English
• ISSNs: 0969-806X

Abstract

Abstract: Borotellurite (ZnBiBaBFTe: ZnO + Bi2 O3 + BaF2 + B2 O3 + TeO2 ) glasses were fabricated by varying Tb2 O3 concentration via the conventional melt and rapid quenching process. The glass stability (150 °C) and thermal stress (0.336) were evaluated using the differential thermal analysis. The rising value in the molar volume (39.69–43.86 cm 3 /mol) and field strengths (6.69–19.41 × 10 15 cm −2 ) was due to the decrease in the density (2.932–2.804 gm/cm 3 ) and inter-atomic distances (5.25 - 3.08 Å) of Tb 3+ ions in ZnBiBaBFTe glasses. Measured excitation (PLE) and de-excitation (PL) spectra indicated that Tb 3+ :ZnBiBaBFTe glasses can be efficiently stimulated from 377 nm of UV radiation and exhibit a dazzle of green emission (543 nm) belonging to the transition 5 D4 → 7 F5 of Tb 3+ ion. The radiative parameters of the level 5 D4 of Tb 3+ ion was predicted from the Ω2, 4, 6 intensity parameters by means of the JO (Judd-Ofelt) phenomenological formalism. Rise in Tb 3+ concentration led to the enhancement of 5 D4 emission transitions and reduction of lifetimes (2.24–1.82 ms) via dipole-dipole interaction. The detailed analysis of glasses revealed efficient lasing action parameters corresponds to branching ratio (> 60%), emission cross-section (14.61 × 10 −22 cm 2 ), gain bandwidth (15.34 × 10 −28 cm 3 ), and quantum efficiency (79%) along with photometric parameters like (x, y) color coordinates (∼0.29, 0.60), color purity (65%), and correlated color temperatures (∼6000 K) for green lasing applications. Highlights: Glass stability (150 °C) and thermal stress (0.336) are evaluated by the DTA analysis. Physical and radiative parameters of glasses are calculated. ꞵexp of (>60%) and gain band width of (15.34 × 10 −28 cm 3 ) are helpful for laser operation. Green emitting (0.29, 0.59) color coordinates with 73% of efficiency are observed.