Photoluminescence Study of Up-Conversion Phosphor La2(MoO4)3 Yb3+, Er3+ Prepared by Precipitation Method

Abstract

Up-conversion phosphors of La₂(MoO₄)₃: Yb³⁺, Er³⁺ with different concentration of Erbium were prepared by a simple precipitation method. The crystal structure, surface morphology, elemental composition, and photoluminescence properties were characterized by X-ray powder diffraction (XRD), Scanning electron microscopy (SEM), Energy-dispersive X-ray Spectroscopy (EDAX) and Photoluminescence spectroscopy respectively. XRD spectra show a high degree of crystallinity in all samples. SEM images show rod-like structures present in the samples. EDAX analysis confirms the presence of dopants (Yb³⁺ and Er³⁺) in the host matrix (La₂(MoO₄)₃). Upon excitation by 980 nm infrared radiation, all the samples give emission peaks between 524 – 533 nm in the bluish-green region, 546 – 555 nm in the green region and 659 – 672 nm in the red region which are attributed to the ²H_11/2 → ⁴I_15/2, ⁴S_3/2 → ⁴I_15/2 and ⁴F_9/2 → ⁴I_15/2 transitions of Er³⁺ ions respectively.