INTENSE GREEN EMISSION PROPERTIES OF RARE-EARTH-ELEMENT-DOPED CaZrO3 PEROVSKITE PHOSPHOR

Abstract

In this work, we report the optical properties of Ho³⁺ doped CaZrO₃ perovskite phosphor synthesized using a solution combustion method. The crystal structure, morphology, and optical properties of resulting phosphors were investigated by X-ray diffreaction, field emission scanning electron microscope, and photoluminescence analysis. X-ray diffreaction result confirms that the single-phase orthorhombic CaZrO₃ was obtained. Under 975 nm excitation of the laser source, the phosphors emitted a strong green region at 523/542 nm and a weak red region at 660 nm, corresponding to the ⁵F₄–⁵I₈/⁵S₂–⁵I₈ and ⁵F₅–⁵I₈ transitions of Ho³⁺ in the host lattice. Power laser excitation-dependent emission intensity indicated that the two-photon absorption produces a green and red upconversion emission. In addition, the obtained phosphor exhibits intense green upconversion emissions and high color purity (99.66%), making it suitable for optoelectronic devices and solid-state lighting applications.