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Photoluminescent powders of CaAl2O4 co-doped with Eu2+ and Tm3+ ions prepared by combustion method were studied. The reaction temperature used was about 500oC. The effect of different excitation wavelength on the luminescent properties of the phosphor is discussed. The as prepared samples were compared with the samples annealed in air at the temperature of 450 oC. The annealing temperature of 450oC used was estimated from the TGA curve of the CaAl2O4:Eu2+,Tm3+ sample. Red emission peaks from the unreacted Eu3+ ions were measured. The emission spectra of the as prepared and annealed samples were compared. Wavelength selective excitations show that the 200 and 360 nm give the intense emission from Tm3+ ions. Bright emission from all emitting centers (Tm3+, Eu3+ and Eu2+ ions) was measured when the excitation wavelengths of 250, 260, 285 and 300 nm were used. The most intense red emission from Eu3+ ions was observed at the excitation wavelength of 230 nm.
Corresponding author: e-mail dhlamms@unisa.ac.za Fax: +27 12 429 2716, Tel: +27 12 429 3643
Keywords: Photoluminescence, Excitation wavelength, Phase transition, Combustion, Luminescence
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