Publication date: 17th July 2025
Near-ultraviolet (NUV)-excited phosphors with near-zero thermal quenching (NZTQ) are essential for the reliable and efficient operation of white light-emitting diodes (wLEDs), as they ensure stable emission even under elevated temperatures. Rare-earth-doped molybdates are promising candidates due to their rigid crystal frameworks, relatively low phonon energies, and compositional flexibility [1-3].
In this work, a series of Dy³⁺-doped LiCaLa(MoO₄)₃ phosphors (0.0–5.0 mol%) were synthesized using a conventional solid-state reaction method in air. XRD patterns confirmed the formation of a pure LiCaLa(MoO₄)₃ tetragonal phase. Raman and FTIR spectra revealed characteristic Mo–O stretching and bending vibrations at 870 cm⁻¹ and 470 cm⁻¹ respectively, while Dy³⁺ incorporation led to slight peak shifts and band broadening, suggesting local structural distortion without phase transformation [4]. SEM/EDX analyses showed a homogeneous microstructure with uniform elemental distribution, while XPS confirmed the Dy³⁺, Mo⁶⁺, and O²⁻ oxidation states, indicating a stable chemical environment. The phosphor samples exhibited intense yellowish emission under commercial mercury lamp with the excitation wavelength of 365 nm, demonstrating the potential of Dy³⁺ as an efficient activator ion in this host lattice. These findings suggest the use of LiCaLa(MoO₄)₃:Dy³⁺ as promising phosphors in NUV-converted wLEDs.
This research was supported by the Early Stage Researcher Grant at FunGlass, Recovery Plan (Project No. 09I03-03-V05-00010, Internal Project No. D10_2024), and by the VEGA project VEGA 1/0045/24.
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