Degradation of Y2SiO5:Ce phosphor powders

Cathodoluminescence of Ce-doped Gd2SiO5 and Gd9.33(SiO4)6O2 phosphor under continuous electron irradiation

“…[12], rather than Refs. [9][10][11]. So, the reduction of CL intensity observed in this study may also be related to the carbon overlayer than the oxide layer formed during the irradiation.…”

“…Kim et al have reported that the darkening occurred in the irradiation because the carbon overlayer was formed on the phosphor surface under current density of 160 A/cm 2 electron beam irradiation at the vacuum level of 10 −6 Pa [12]. Coetsee et al have reported the formation of the new oxide layer under high current density electron irradiation (26 mA/cm 2 ) at 10 −5 Pa oxygen pressure [9][10][11]. The present electron current density (200 A/cm 2 ) and vacuum level (10 −6 to 10 −7 Pa) are almost the same as the values in Ref.…”

“…The field emission displays (FEDs) application also requires phosphors to have the high stability during continuous electron beam irradiation [3]. Many works on the degradation mechanism under the continuous electron beam irradiation (CL degradation) have been reported on sulfide and oxide phosphor materials [4][5][6][7][8][9][10][11][12].…”

“…Coetsee et al reported the CL degradation of Ce-doped Y 2 SiO 5 (YSO:Ce) particles under the continuous electron beam irradiation with high current density at 10 −5 Pa oxygen pressure [9][10][11]. X-ray photoelectron spectroscopy (XPS) showed the formation of silicon dioxide, CeO 2 and CeH 3 layer responsible for the CL degradation.…”

A Study of Synthesis of Cerium-Doped Yttrium Silicate and Yttrium Disilicate Phosphors by the Ammonia-Added Sol-Gel Method

“…In addition, yttrium silicate is itself also used as high-temperature protective coatings for silicon carbide composites reinforced with carbon fibres, used in aerospace application [4]. Recently, there have been a number of studies on the synthesis of yttrium silicate doped by europium or cerium [2,[5][6][7][8][9][10][11][12]. However, synthesized phosphors often contained unreacted Y 2 O 3 /SiO 2 constituents or additional silicate/disilicate phases [5][6][7][8][9], possibly creating negative effects on luminescent properties.…”