Cyan-emitting Ca₉NaGd_2/3(PO₄)₇:Eu²⁺ phosphors were synthesized via high temperature solid-state route. X-ray powder diffraction (XRD) and scanning electron microscopy (SEM) were used to verify the phase and morphology of the Ca₉NaGd_2/3(PO₄)₇:Eu²⁺ (CNGP:Eu²⁺) phosphors. The as-obtained phosphor exhibits a broad excitation band of 250–420 nm, which is near the ultraviolet region. An intense asymmetric cyan emission at 496 nm corresponds to the 5d-4f transition of Eu²⁺. The multiple-site luminescent properties of Eu²⁺ ions in CNGP benefit from versatile structure of β-Ca₃(PO₄)₂ compounds. The effective energy transfer distance is 5.46 nm (through the spectral overlap calculation), validating that the resonant energy migration type is via dipole–dipole interaction mechanism. Compared to the initial one at room temperature, the luminescent intensity of CNGP:Eu²⁺ phosphor can maintain 77% as it is heated up to 420 K. A white light-emitting diode (WLED) with excellent luminescent properties was successfully fabricated. Moreover, the CIE chromaticity coordinates of fabricated WLED driven by changing current just change slightly.

通过高温固相路线合成了发青色的Ca ₉ NaGd _2/3 (PO ₄ ) ₇ :Eu ^{2+荧光粉。}X射线粉末衍射(XRD)和扫描电子显微镜(SEM)用于验证Ca ₉ NaGd _2/3 (PO ₄ ) ₇ :Eu ²⁺ (CNGP:Eu ²⁺ )荧光粉的相和形态。所获得的荧光粉具有 250-420 nm 的宽激发带，接近紫外区。496 nm 处的强烈不对称青色发射对应于 Eu ²⁺的 5d-4f 跃迁。^{Eu 2+}的多点发光特性CNGP 中的离子受益于β -Ca ₃ (PO ₄ ) ₂化合物的多功能结构。有效能量转移距离为5.46 nm（通过光谱重叠计算），验证了共振能量转移类型是通过偶极-偶极相互作用机制。与最初的室温相比，CNGP:Eu ²⁺荧光粉在加热至420 K时发光强度仍可保持77%。成功制备出具有优异发光性能的白光发光二极管（WLED）。此外，通过改变电流驱动的制造的WLED的CIE色度坐标只是略有变化。