Effect of Eu3+ and Tb3+ ions concentration on the mechanical, structural, and photoluminescence properties of phosphate glass fibers

Abstract

Two series of phosphate glasses belonging to the (65-x) P 2 O 5 -35CaO-xRE 2 O 3 system (RE = Eu or Tb; 0 ≤ x ≤ 6 mol%) were prepared by the melt-quenching technique. All compositions were successfully drawn as continuous monofilaments fibers. The effect of Eu 3+ and Tb 3+ ions concentration on their mechanical, structural, and photoluminescence properties was investigated. The results revealed that the highest tensile strength was 1031 ± 34 MPa for fibers doped with 6 mol% of Eu 2 O 3 and 1014 ± 65 MPa for fibers doped with 6 mol% of Tb 2 O 3 . The addition of RE 2 O 3 showed an increase in density and Tg. A structural investigation was carried out using FTIR spectroscopy. The photoluminescence properties in terms of excitation and emission spectra were investigated in detail. The most intense emission band at 611 nm corresponds to the 5 D 0 → 7 F 2 transition of Eu 3+ ions under 392 nm excitation was observed for fibers doped with 6 mol% of Eu 2 O 3 . The most intense emission band at 543 nm corresponds to the 5 D 4 → 7 F 5 transition of Tb 3+ ions under 374 nm excitation was observed for fibers doped with 6 mol% of Tb 2 O 3 . These two compositions exhibited the highest absolute quantum yield, reaching 20.25% and 4.81%, respectively.

The coupling of blue emitting carbon dots with Eu3+/Tb3+ co-doped luminescent glasses for utilization in white light emitting diodes

“…For the Eu 3+ ion, the excitation transitions are 7 F 0 -5 H 3-7 (319 nm), 7 F 0 -5 D 4 (361 nm), 7 F 0 -5 G 3 (378 nm) and 7 F 0 -5 L 6 (393 nm). [46][47][48] Almost independent of the glass thickness, 7 F 6 -5 G 6 (376 nm) and 7 F 0 -5 L 6 (393 nm) are identified as the most intense bands for Tb 3+ and Eu 3+ ions, respectively. Consequently, the common excitation wavelength for both excitation bands of Tb 3+ and Eu 3+ ions is determined as 375 nm by considering the PLE spectra of all luminescent glasses.…”

Optical and scintillation properties of Lumilass-G and -R glasses

“…58,59) PL QYs of Lumilass-G9 and -R7 glasses were 90 (integration from 470 to 630 nm upon 350 nm excitation) and 91% (integration from 580 to 720 nm upon 400 nm excitation), respectively. Up to now, QYs of some Tbdoped glasses have been reported, and examples are 50∼60% in Li and 20% in 65P 2 O 5 −35CaO 61) have been reported. Since the aim of Lumilass glasses is mainly a PL phosphor, the PL QYs of them are relatively higher than any other glasses in basic research.…”