Luminescence and optical absorption studies of submicro-dimensional cerium ortho- and metaphosphates doped with Eu3+ ions

Luminescent properties of Na3Gd1−xEux(PO4)2 and energy transfer in these phosphors

“…The radius of Eu 3+ ion (∼106.6 pm) is similar to that of Gd 3+ ion (∼105.3 pm) with coordination number eight [37]; therefore, Eu 3+ there are six different R 3+ sites with two six-fold, three seven-fold and one eight-fold coordination to oxygen ions [19,24]. The positions for the R 3+ give C 1 as the site symmetry for all the sites [24,35]. At room temperature, the 7 F 1 level is thermally populated due to the small energy gap of 7 F 1 and 7 F 0 (∼370 cm −1 ), so the transition of 7 F 1 → 5 D 1 was observed at 533 nm.…”

“…The structural and spectroscopic properties of the alkali metal lanthanide double phosphates, M 3 R(PO 4 ) 2 (R = trivalent lanthanide ions), doped with different lanthanide ions have been subject to considerable interest in the past [19][20][21][22][23][24][25][26][27][28][29][30][31][32][33][34][35][36]. However, there are no detailed reports on the photo-luminescent properties of Na 3 Gd(PO 4 ) 2 :Eu 3+ under NUV excitation, i.e., little research on potential application in phosphor-converted WLEDs has been report.…”

Optical and thermal characterization of microcrystalline Na3RE(PO4)2:Yb orthophosphates synthesized by Pechini method (RE= Y, La, Gd)

“…The structural and optical properties of the double phosphates have been extensively studied for the last decade [17][18][19][20][21][22][23][24][25][26][27][28][29][30][31]. However, sodium orthophosphates Na 3 RE(PO 4 ) 2 have been optically characterized [7, 19-21, 25, 31] mainly in its orthorhombic form.…”

Synthesis, Structure, and Optical Properties of LiEu(PO3)4Nanoparticles

“…Figure presents the representative results of the measurements for the LiEu(PO 3 ) 4 nanocrystalline sample sintered at 800 °C. In the region of 200−300 nm, the spectra consist of high intensity bands corresponding to the charge transfer (C-T) transitions between Eu 3+ and O 2 and overlapping 4f → 5d transitions of Eu 3+ . Above 350 nm, one may observe absorption ascribed to the f−f optical transitions from the 7 F 0 and 7 F 1 levels to the excited states of Eu 3+ .…”