Structural and optical properties of Ce-doped strontium borophosphate glasses
- PDF / 1,832,021 Bytes
- 8 Pages / 595.276 x 790.866 pts Page_size
- 82 Downloads / 306 Views
ORIGINAL PAPER
Structural and optical properties of Ce-doped strontium borophosphate glasses P Ramakrishna1,2, Sitakanta Panda1,4, P Vinod Kumar1,4, D K Mohapatra2, H Jena1,3* and B S Panigrahi1,4* 1
Homi Bhaba National Institute, Mumbai, India
2
Safety Research Institute, Atomic Energy Regulatory Board, Mumbai, India 3
Material Chemistry and Metal Fuel Cycle Group, Chennai, India
4
Safety Quality & Resource Management Group, Indira Gandhi Centre for Atomic Research, Kalpakkam, Tamil Nadu 603102, India Received: 31 December 2019 / Accepted: 25 August 2020
Abstract: In the present study, cerium-doped (0–1 mol%) strontium borophosphate (SBP) glasses were prepared through the melt quenching method. The structural and thermal properties of the glasses were investigated using XRD, FT-IR and TG–DTA. The elemental mapping of Ce-doped glasses was carried out using energy-dispersive X-ray (EDX). The photoluminescence (PL) excitation spectrum of Ce-doped SBP glass exhibited two peaks at 264 and 315 nm, and the emission spectrum exhibited a broad peak around 360 nm. PL lifetime measurements of Ce3? indicated two lifetimes (\ 25 ns) suggesting its presence at two different sites. The PL intensity and lifetime of Ce3? increased with the increase in Ce-concentration up to 0.3 mol% and beyond that it decreased due to concentration quenching. Thermally stimulated luminescence (TSL) of c-irradiated (40 Gy) SBP: Ce glasses showed a broad glow peak around 629 K. TSL intensity increased with the increase in Ce-concentration up to 0.5 mol% and beyond that it decreased. TSL trap parameters such as trap depth, frequency, symmetry and the order of kinetics were determined to explore the dosimetric properties of the material. Keywords: Ce-doped strontium borophosphate glass; Photoluminescence; Thermally stimulated luminescence; Trap parameters
1. Introduction Rare earth (RE)-doped glasses are used as light-emitting diodes (LEDs), optical waveguides, high-energy radiation scintillators and radiation-resistant fibers due to their unique optical properties [1–5]. The Ce3?-doped glasses have superior light yields due to the Laporte allowed 5d ? 4f transitions and wide separation of energy levels [2]. The absence of a cross-relaxation mechanism and negligible multi-phonon relaxation of the excited population of Ce3? in suitable hosts render better optical properties [3]. Unlike other trivalent lanthanides, Ce3?-doped glasses show fast luminescence decay in nanoseconds regime (\ 50 ns) due to allowed 5d ? 4f transitions. Hence, it is used as an activator in scintillating materials
*Corresponding author, E-mail: [email protected]; [email protected]
for fast event detection [1]. The phosphate-based glasses have poor chemical durability and thermal stability. The addition of mixed-alkali oxides and trivalent metal oxides to phosphate glasses improves the chemical durability and thermal stability of the glass as well [4]. The addition of B2O3 to phosphate glasses is well known for enhancing the chemical durability as well as thermal and me
Data Loading...
