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A blue-emitting phosphor of titanium-doped zinc spinel (ZnAl2O4:Ti; Ti=0–6.0mol% in relation to Al) nanopowders was prepared by a simple sol–gel method. On annealing at 1000°C, single-phase ZnAl2O4:Ti powders had primary particles of 25–30nm in size and most Ti ions in the form of Ti4+. Under UV excitation at 280nm, a strong and broad blue emission centered at 435nm was observed. The sources of the...