Abstract
Calcium aluminosilicate (Ca3Al2Si6O18) powders containing different doping concentrations of luminescent trivalent terbium ions (Tb3+) were prepared by combustion synthesis. Non-crystalline samples were obtained with heat treatment at 850°C for 4h. Luminescence corresponding to 4f‐4f electronic transitions originating from states 5D3 and 5D4 of Tb3+ were observed under UV excitation at λ = 355nm. Tunable green-to-white emission was obtained by adjusting the Tb3+ doping concentration. The origin of the color change phenomenon was attributed to the presence of energy transfer among Tb3+ ions. The energy transfer mechanism was found to be predominantly of exchange type. The potential use of this phosphor for solid state white lighting was carefully assessed by estimating its chromaticity coordinates, correlated color temperature and luminescence quantum yield.
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