EPR, optical absorption and photoluminescence properties of Cr3+ ions in lithium borophosphate glasses

EPR, optical absorption and luminescence studies of Cr3+-doped antimony phosphate glasses

“…It is verified that the optical band gap decreases (red shift) with an increase of the Cr 3+ doped into the SbPO glasses. Our result agrees with that reported by Kesavulu et al [18] and El-Diastya et al [32]. This is attributed to the Cr 3+ doping which creates localized levels close to the conduction band of antimony phosphate glass.…”

“…The effective g value in the low magnetic field portion of the spectrum (g = 5.11) is attributed to isolated Cr 3+ ions in distorted octahedral sites [14,15,22]. The effective g value in the high magnetic field (g = 1.97) is associated with the contribution of both exchange coupled pairs of Cr 3+ ions (antiferromagnetic Cr 3+ -Cr 3+ ) which are individually sixfold coordinated and isolated Cr 3+ ions at axiallydistorted octahedral sites [11,14,18,23].…”

“…4 A 2 (F), R-line) and another intense broad band from 14,500 to 11,100 cm À1 (700-850 nm) centered at 12,790 cm À1 (782 nm) ( 4 T 2 (F) ? 4 A 2 (F)), due to Cr 3+ electronic transitions which depend on the crystal field strength of the host lattice [18,19,37], but also strongly affected by energy transfer from single Cr 3+ ions to pairs [38] and the thermal population of the 4 T 2 (F) level [12,39].…”

“…Cr 3+ -doped inorganic glasses were extensively studied in the last decade due to their potential application for tunable solid state lasers and VIS-NIR broadband luminescent materials [13][14][15][16][17][18][19]. In this context, Cr 3+ -doped antimony phosphate glasses are of great interest, being a new promising host for incorporation of Cr 3+ ions which yields favorable properties for optical absorption and broader VIS-NIR emission bands than other amorphous and crystalline systems.…”

Influence of Various Glass Compositions on Physical and Spectroscopic Properties of Cao-Pb3O4-Zno-P2O5 Glass System

“…Using Tanabe-Sugano diagrams for d 3 ions, the observed optical absorption bands are assigned to 4 A 2g (F) → 2 T 1g (F), 4 A 2g (F) → 2 T 1g (G), 4 A 2g (F) → 4 T 2g (F) and 4 A 2g (F) → 2 E g (G). The observed bands indicated that Cr 3+ ions are present mostly in distorted octahedral coordination [14]. The presence of octahedral site is assumed to be related to the strong field stabilization energy of Cr 3+ ions in sixfold coordination [15].…”