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A detailed characterization of BaMgAl10O17:Eu phosphor as a thermal history sensor for harsh environments<sub/>

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Figure

Figure 1. The samples were excited by using the third and fourth harmonics (355 nm and 266 nm respectively) of a pulsed Nd:YAG laser (Quanta-Ray LAB-150, Spectra Physics)
Figure 2 for a sample heat treated at 1000 °C for 20 minutes, consists of a broad band emission centred at 445 nm (due to 4f65d→4f7 transitions of Eu2+) and a series of peaks between 550 nm and 750 nm (due to 5D0 to 7F0,1,2,3,4 transitions of Eu3+)
Figure 2). However, the absolute emission intensity obtained using 355 nm excitation is lower (by about 20 % according to the excitation spectra in [23]) and the relative intensity of the peaks due to emission of Eu3+ and Eu2+ ions is about 50 % lower as s
Figure 2, for samples heat treated for 20 minutes. The absolute value of ρ is higher when the phosphor is excited with 266 nm light as a result of the higher relative intensity of the 611 nm peak to the 445 nm band
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