Zinc gallate (with an appropriate dopant) has received considerable attention for potential applications in low-voltage cathodoluminescent,
vacuum fluorescent displays, field emission displays and thin film electroluminescent devices [1,2]. As compared to commonly used sulfide phosphors, ZnGa2O4 is recognized as attractive candidate of phosphor host material for flat panel display (FPD) due to its good luminescent characteristics, chemical and thermal stabilities in high vacuum and absence of corrosive gas emission under electron bombardment [3,4].