Operation by Eu luminescence in CaAl2O4:Eu2+ alloys by Zn substitution

Cr3+ doping optimization in CaAl2O4:Eu2+ blue phosphor

“…These defects neutralize the electron-hole recombination processes, therefore, reduces the emission intensity as well as traps responsible for the long persistence. Similar mechanism was found to be responsible for the Zn 2+ and Mg 2+ ion codoping in this aluminate phosphor which generates defect traps and results in slightly longer decay time [20]. The optimized concentration of the Eu (2 mol%) and Cr (0.1 mol%) is seems to be promising high luminescence and longer persistent time blue phosphor.…”

Doping optimization of Eu and Ho activator ions in polycrystalline CaAl2O4

“…This combination of Eu and Ho concentration also shows longer decay time compared to other concentrations. The mechanism of the long persistence is due to the holes trappedtransported-detrap process [13][14][15].…”

Design of Long Persistent White Phosphorescence in a Composite Phosphor Via Energy Transfer Mechanism

“…For example, white light is generated f bi-color mixing of blue light from InGaN blue LED and yellow light from the blue LED excited YAG:Ce [17][18][19][20][21] blue phosphor was pre according the literature [9,22]. The yellow phosphors Sr 3-x-y Zn y SiO 5 :xEu 2+ were prepared by the reaction between strontium carbonate (SrCO 3 ; Aldrich, 99.9%), oxide (ZnO; Aldrich, 99.5%), fumed silica nm, AR) and europium oxide (Eu 2 O 3 ; Aldrich, 99.99%) in a reducing atmosphere of H 2 /N 2 = 1/9 (20 ml H various temperatures (1100 -1450 ℃) for 4 were weighed according to the chemical composition x-y) SrCO 3 + 1 SiO 2 + x at% Eu + y at% Zn amounts of the starting materials according to the derived compositions were mixed thoroughly in a with the help of ethanol.…”