Abstract
A novel multicolor-tunable lanthanide doped 12CaO·7Al2O3 (Ln3+:C12A7; Ln3+ = Yb3+, Tm3+ and Er3+) synthesized by solid-state reaction method would greatly enhance the scope of its applications ranging from infrared solar cells to field emission display. The scanning electron microscopy (SEM) was used to characterize the morphology of Ln3+:C12A7. Under 980 nm excitation, the emission color was tuned from green-yellow to red region through adjusting the concentrations of Ln3+ ions. The obtained near infrared upconversion (UC) emissions in Ln3+:C12A7 was corresponded to “window of optical transparency”. All blue, green and red UC emissions were populated by one-photon process, and the proposed UC mechanisms were studied in Ln3+:C12A7.
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