Na2CaSiO4:Eu3+-deep red-emitting phosphors with intense 5D0→7F4 transition

The influence of charge compensation defects on the spectroscopic properties of europium doped Ca9Y(PO4)7

“…13,15 The crystal lattice of b-Ca 3 (PO 4 ) 2 has ve different cation sites: seven coordinated Ca(1) positions, eight coordinated Ca (2) and Ca(3) positions, three coordinated Ca(4) positions, which are statistically half occupied by the Ca 2+ ions and half empty (cation vacancies), and the six coordinated Ca(5) positions, distorted octahedral sites, fully occupied by Ca 2+ ions. 21,22 Similar situation can be found in Ca 9 Y(PO 4 ) 7 with exception that Ca(3) site is nine coordinated, Ca (5) sites are occupied by the Y 3+ ions and all Ca(4) sites are empty (due to the charge imbalance of Ca 2+ -Y 3+ substitution in Ca (5)). The substitution of Ca 2+ by the Y 3+ ions in Ca(5) sites does not change the space group of the crystallographic structure and Ca 9 Y(PO 4 ) 7 crystallizes in the trigonal R3c (161) space group as in the case of Ca 3 (PO 4 ) 2 .…”

“…The widely studied hosts of phosphors are based on borates, phosphates, aluminates, silicates, vanadates, etc. [1][2][3][4][5][6] Among them, phosphates have been paid intense attention due to their excellent properties. 7 One of the promising materials in phosphates family is Ca 9 Y(PO 4 ) 7 , which has two different cations (Ca 2+ and Y 3+ ) that are available for lanthanides substitution.…”

Glowing Combustion Synthesis, Characterization, and Toxicity Studies of Na2CaSiO4Powders

“…Now a days, rare-earth ions doped A 2 MSiO 4 (A=Li, K & M= Sr, Ba, Mg) silicate systems are the topic of interest in the field of materials science for LED applications, since these materials satisfies the demands of promising host material properties. Na 2 CaSiO 4 also A 2 MSiO 4 type silicate system and as expected, recently much attention has paid on the development of Na 2 CaSiO 4 as efficient phosphor material by doping rare earth ions (Eu 3+ , Eu 2+ and Ce3 + ) then other sodium calcium silicates (Na 2 CaSiO 4 , Na 2 Ca 2 Si 3 O 9 , Na 2 Ca 3 Si 6 O 16 , Na 2 Ca 3 Si 3 O 10 and Na 6 Ca 3 Si 6 O 18 ) [8][9][10][11].…”

A novel red-emitting Eu 3+ -doped Na 2 MgSiO 4 phosphor with high intensity of 5 D 0 → 7 F 4 transition

“…However, most of the silicate phosphors show the dominant emission either 5 D 0 → 7 F 1 (~593 nm) or 5 D 0 → 7 F 2 (~610 nm) transition of Eu 3+ ions. The emission dominated by 5 D 0 → 7 F 4 (~703 nm) transition is infrequent [11]. However, in the field of crystalline silicon (c-Si) solar cells, it is demonstrated that the increasing of photons emitted in the wavelength range of 700-900 nm will enhance the conversion efficiency [12,13].…”

“…The mean size is 0.82 µm. [11,16]. Both references indicated that two or more different emission centers are expected to cause the unusual phenomenon.…”