Abstract
Exploring green-emitting phosphors with high efficiency and thermostability is a significant issue for enhancing lighting and display quality. In this report, we adopted a facile urea-assisted combustion method to rapidly synthesize terbium-activated NaLaP4O12 (NLPO) powder with high crystallinity. The activators Tb3+ are incorporated into the NLPO lattice via equivalently replacing La3+ ions. Excited at 368 nm, it presents a bright green-emitting performance with high internal quantum efficiency, coming from the dominant 5D4→7F5 transitions of Tb3+. The green-emitting content quenching is controlled by the dipole–dipole interaction. Meanwhile, the emission in response to temperature reveals that the nearly zero-thermal-quenching is induced by the high activation energy barrier (0.31 eV) and suitable structure rigidity. Finally, the light emitting diodes are encapsulated using the studied material, manifesting that it would be a prospective green-emitting candidate. The research shows a guide for developing the terbium-activated phosphors with high luminescence efficiency and excellent thermostability.
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