Study on the reduction of Eu3+→Eu2+ in Sr4Al14O25: Eu prepared in air atmosphere

Eu2+luminescence in strontium aluminates

“…The larger spectral overlap is further enhanced by a large spectral shift of the high energy emission from 425 to 400 nm between 4 and 300 K. Consequently, emission from Eu(1) can be transferred to the Eu(2) center, which leads to a decrease in the short wavelength emission intensity and an intensity enhancement in the long wavelength emission. [42][43][44][45] 1 mol%, the intensity of the high energy emission measured at 4 K is weak (Fig. 11).…”

Study of Eu3+→Eu2+ reduction in BaAl2O4:Eu prepared in different gas atmospheres

“…Several gases such as N 2 /H 2 , H 2 , carbon, CO and NH 3 [1] are commonly used as reducing agents. In general, the Eu reduction can occur easily using a reducing atmosphere [13,14], but there are also cases where there is no need, for example when the Eu reduction occurs without the use of a reducing agent [15][16].…”

Eu and Dy Co-activated SrB2Si2O8 Blue Emitting Phosphor: Synthesis and Luminescence Characteristics

“…(Peng et al 2003) and SrB 4 O 7 (Liang et al 2002) were reported to exhibit such behaviour. According to Pei et al (1999) (Shannon 1976) should be close and lastly, host crystal structure should stabilize the Eu 2+ ions with three dimensional network of MO 4 tetrahedral (M = B, Si, Al, P, S).…”

“…However, it is worth mentioning that incorporation of Dy 3+ ions further reduced the Eu 3+ ions in both samples sintered in air and carbon monoxide. Eu 3+ reduction effect by co-doping was firstly reported by Pei et al (1999) and Peng et al (2003). They proposed a model in which the more electrons on negative defect were created; more Eu 3+ ions were reduced.…”