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Rare earth-activated phosphors demonstrate significant application potential across various fields, including lighting, displays, anti-counterfeiting, and optical thermometry measurement. This study focuses on the development of multifunctional optical materials for lighting and temperature sensing through the synthesis of a series of Dy3+-doped Ca7NaY(PO4)6 phosphors via high-temperature solid-state reaction. The phase purity and morphological characteristics of the obtained samples were confirmed by X-ray diffraction and scanning electron microscopy. Luminescence properties and energy transfer mechanisms were systematically investigated through photoluminescence spectroscopy and fluorescence decay analysis. Under 350 nm near-ultraviolet excitation, the emission intensity of Ca7NaY(PO4)6: Dy3+ increases with rising Dy3+ concentration until reaching an optimal value at x = 0.07, beyond which concentration quenching occurs. This quenching behavior is attributed to enhanced non-radiative energy transfer at higher Dy3+ concentrations, leading to a corresponding decrease in fluorescence lifetime. The optimized Ca7NaY(PO4)6: 0.07Dy3+ phosphor displays remarkable thermal stability, retaining 86.9% of its initial emission intensity at 150 ℃. The white LED device fabricated using the obtained phosphor and near-UV LED chip shows excellent performance with a correlated color temperature of 5680 K, CIE coordinates of (0.3275, 0.3883) in the white light region and a color rendering index of 85. Furthermore, temperature-dependent fluorescence intensity ratio analysis reveals excellent optical thermometric performance, achieving a maximum relative sensitivity (Sr) of 1.72% K-1. These results indicate that the Ca7NaY(PO4)6: Dy3+ phosphor exhibits significant potential for application in single-matrix phosphor-converted white LEDs and high-precision optical optical thermometry.
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Keywords:
- Dy3+ /
- phosphor /
- LED /
- optical temperature sensing
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