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稀土离子掺杂荧光粉在照明、显示、防伪和光学测温等领域具有广阔的应用前景。本文采用高温固相法制备了Ca7NaY(PO4)6: xDy3+ (x = 0.01-0.11)系列荧光粉。通过X射线衍射和扫描电子显微镜对样品的晶体结构和微观形貌进行了表征，并采用荧光光谱和荧光寿命衰减曲线对其发光特性和能量传递机制进行了系统研究。在350 nm近紫外光激发下，样品的发光强度随Dy3+掺杂浓度增加呈现先递增后递减的变化趋势，在x =0.07时达到最大值。Dy3+浓度增加导致非辐射跃迁增强，荧光寿命逐渐降低。Ca7NaY(PO4)6: 0.07Dy3+在150 ℃高温下发光强度仍为室温时的86.9%，展现出优异的热稳定性。利用最佳样品与近紫外LED芯片封装所得白光LED器件性能优良，其相关色温为5680 K，色坐标位于(0.3275, 0.3883)。此外，基于荧光强度比技术的温度传感特性研究表明，该材料具备良好的光学测温潜力，最大相对灵敏度达到1.72% K-1。结果表明，Ca7NaY(PO4)6: Dy3+荧光粉在固态照明及光学温度传感领域具有潜在的应用价值。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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