Effect of heat treatment on photoluminescence behavior of BaMgAl10O17:Eu phosphors

On phosphor degradation mechanism: thermal treatment effects

“…That is particularly true for the barium magnesium aluminate BaMgAl 10 PDPs [2][3][4]. This phosphor is well adapted for its used in PDPs because of its high quantum efficiency (around 80%), its good chromaticity-corresponding to a broad band around 450 nm due to the transition from 4f 6 5d 1 to 4f 7 of divalent europium ions-and its strong absorption under vacuum ultraviolet excitation [5,6].…”

On the kinetics of thermal oxidation of the thermographic phosphor BaMgAL 10 O 17 :Eu

“…However, the manufacture of these devices usually involves heat treatment in air at a relatively high temperature (about 600 °C), and the photoluminescence of the phosphor is then decreased due to thermal degradation that results in oxidation of the dopant ion from Eu 2+ to Eu 3+ and a substantial reduction in blue emission. This thermal degradation has been a common subject of study in recent years with the objective of understanding the mechanisms by which the phosphor degrades and thereby being able to fabricate a more resistant phosphor that remains efficient even after the necessary heat treatment [4][5][6][7][8][9][10]. The literature in the field, however, suggests that understanding remains incomplete and some of the mechanisms suggested are contradictory.…”

“…Oshio et al [4] suggested that oxidation of Eu 2+ results in the formation of a new magnetoplumbite phase (Eu 3+ MgAl 11 O 19 ), and Kim et al [6] used Rietveld refinement analysis to calculate the concentration of this secondary phase to be 2.5 %, 3.7 % and 12 % by weight after exposure for 1 hour at 700 °C, 900 °C and 1400 °C respectively. On the other hand, using x-ray diffraction (XRD), Yamada et al [7] could only identify the new phase after exposures to temperature in excess of 900 °C.…”

Comparative study on luminescent properties of LiLa2BO5:Eu3+ phosphors synthesized with different methods

“…As a consequence, the f-f emission spectra consist of sharp lines [15]. Among the RE ions, trivalent europium has attracted significant attention because it has tremendous potential for applications in some optical fields, such as electroluminescent devices, optical amplifiers and density optical storage [16,17].…”