Combustion synthesis of CaSc2O4:Ce3+ nano-phosphors in a closed system

Synthesis and luminescence properties of clew-like CaMoO4:Sm3+, Eu3+

“…[1][2][3][4][5]. Recently, rare earth doped phosphors for white-light-emitting diodes (W-LEDs) have received increasing interest because the promising applications of LED on illuminations with advantages over the existing incandescent and halogen lamps in power efficiency, reliability, long lifetime and environmental protection [6][7][8][9].…”

Effects of BaF2Flux on the Synthesis of Green Emitting Phosphor CaSc2O4:Ce3+

“…[6][7][8] The emission spectra show no significant changes in the shape and peak position under excitation wavelength at 437 and 460 nm. The broad emission band is well coincident with those reported.…”

“…4 However, this type of white LED emits little red light and therefore has a low color rendering index. 7,8 The commercial phosphors are usually synthesized with solid station reaction. 5 This type of white LED requires green and red phosphors with high quantum efficiencies under blue-light excitation.…”

Influence of Ce3+ Concentration on the Thermal Stability and Charge-Trapping Dynamics in the Green Emitting Phosphor CaSc2O4:Ce3+

“…Figure (a,b) shows the room temperature PL excitation and emission spectra as normalized to the maximum intensity for all Ce 3+ doped samples. The excitation spectra [Figure (a)] were measured at fixed emission wavelengths of 518 and 567 nm, respectively, and possess three maxima at approximately 445 nm (4 f → 5 d 1 transitions), 325 nm (4 f → 5 d 2 transitions), and 285 nm (4 f → 5 d 3 transitions), respectively. − The position and width of each excitation band do not change significantly as a function of the Ce 3+ concentration or by fixed emission wavelengths. However, for the 325 and 285 nm bands, related to the 4 f → 5 d 2 and 4 f → 5 d 3 transitions, respectively, the largest excitation intensity is observed for CSO (1.0), with a slightly lower intensity for the other compositions.…”

“…A novel and technologically promising green phosphor is calcium scandium oxide, CaSc 2 O 4 (CSO), which when doped with a small amount of Ce 3+ to substitute for Ca 2+ (CSO:Ce 3+ ), shows a broad-band absorption spectrum in the range 360–500 nm, which overlaps with the emission from a blue LED, and green-light emission in the range 450–700 nm due to electronic Ce 3+ 5 d → 4 f transitions. − The CSO crystal structure may be described in terms of a three-dimensional network of edge- and corner-sharing ScO 6 octahedra with an overall orthorhombic symmetry (space group Pnma ) . There is one Ca, two Sc, and four different O sites (Figure ).…”