Rare-earth-doped transparent yttrium silicate thin film phosphors for colour displays

Degradation of Y2SiO5:Ce phosphor powders

“…7, with XPS, it must be pointed out that reported results on the PL [19] and CL [21] of Y 2 Si 2 O 7 :Ce indicated an emission peak in the deep red region at around 642 nm, which is much stronger in intensity than the other peak at around 420 nm (deep blue). Y 2 Si 2 O 7 has a different crystal field than Y 2 SiO 5 and doping it with Ce 3+ leads to a difference in the splitting effects of the 5d energy levels.…”

“…Ce 3+ has an electron configuration of [Xe].4f 1 .5d 1 .6s 2 with the 5d and 6s electrons that shield the inner 4f electron. This results in the 5d-4f transition being very sensitive to the host lattice and crystal field [21].…”

“…This results in the main emission peak being at 642 nm due to the 5d-4f 7/2 transition. Since Y 2 Si 2 O 7 :Ce is polymorphous, it is very difficult to study its crystal structure [21]. The different crystal structures are a result of different contributing factors such as sample preparation [5,7] and annealing affects [19].…”

Spectroscopic and structural properties of polycrystalline Y 2 Si 2 O 7 doped with Er 3+

“…These hosts exhibit also a minimal effect of nuclear spins of the constituent elements which results in narrow homogeneous emission lines of the dopant RE ions [7,8,9]. Y 2 SiO 5 (YSO) doped with Ce-ions (YSO:Ce 3+ ) is one of the best low-voltage phosphors for field emission displays due to its high efficiency, colour purity and stability [2,3,[9][10][11]18], YSO:Tb 3+ is considered one of the best green emitting cathodoluminescent phosphors [1] and YSO:Eu 3+ as a promising phosphor for high resolution applications [13][14][15]19].…”

“…Yttrium silicates are among the most interesting hosts for rare-earth (RE) ions, which substitute easily Y 3+ ions [1][2][3][6][7][8][9][10][11][12][13][14][15][16][17][18][19]. These hosts exhibit also a minimal effect of nuclear spins of the constituent elements which results in narrow homogeneous emission lines of the dopant RE ions [7,8,9].…”