Enhanced luminescence intensity and color purity of the red emitting LnVO4:Eu3+@ SiO2 (Ln=Gd, Y and Gd/Y) powder phosphors

Luminescence enhancement in monoclinic CaAl2O4:Eu2+, Cr3+ nanophosphor by fuel-blend combustion synthesis

“…[1][2][3][4]. Aluminate based phosphors have been deployed in a variety of technologies such as plasma, field emission, and surface conduction electron displays [5][6][7].…”

Vanadate Phosphors for Energy Efficient Lighting

“…It could be observed that the excitation spectra of the samples annealed at 750, 850, 950, 1050, 1150, and 1250°C exhibited a broadband excitation covering from 300 nm to 375 nm, and the main peak was around 360 nm which corresponds to the 1 A 1 -1 T 1 transition of VO 4 3-group as explain above [67]. The weak absorption peaks at longer wavelength region are originated from the general f-f transitions within the Eu 3+ -4f 6 electronic confi guration [66]. The excitation spectra show a strong absorption band in the UV as discussed above.…”

“…The absorption intensity of the general f-f transitions of the Eu 3+ ions at the longer wavelength region was very weak compared to VO 4 3-group. This indicates that the excitation of the Eu 3+ ions was mainly through VO 4 3-groups, i.e., by the energy transfer from the VO 4 3-groups to Eu 3+ ions [66]. It is clear that the VO 4 3-excitation spectrum of Ba 3-3x/2 (VO 4 ) 2 :xEu (0 ≤ x ≤ 0.3) extends into the near UV, so this blue-green phosphor can be effi ciently excited by 360 nm UV-LEDs.…”

“…The transition sharp peak ~387 nm due to 7 F 0 -5 L 6 and 5 D 4 transitions between levels of the 4f 6 confi guration that are forbidden by the parity selection rule seem to occur by vibronic coupling in the Ba 3-3x/2 (VO 4 ) 2 :xEu (0 ≤ x ≤ 0.3) lattice [14]. The broad excitation band positioned is attributable to the allowed transition 1 A 1 → 1 T 1 with the charge transfer states (CTS) of VO 4 3-, i.e., According to molecular orbital theory, the broad band corresponds to the transition from the 1 A 2 ( 1 T 1 ) ground state to 1 A 1 ( 1 E) and 1 E ( 1 T 2 ) excited states of VO 4 3-ions [66]. The absorption intensity of the general f-f transitions of the Eu 3+ ions at the longer wavelength region was very weak compared to VO 4 3-group.…”

Effect of ultrasound treatment on the morpho-structural and luminescent characteristics of cerium doped yttrium silicate phosphors

“…Sonication can be also adopted in order to get fine particle size, and avoid the possible particle agglomerations [27].…”