White light emission phosphors are widely researched for application in lighting and display fields. However, the poor thermal stability is a real problem for the known single-phased white phosphors, which limits their further application. In this paper, Ca₁₉Na₂Mg(PO₄)₁₄: xDy³⁺, yTm³⁺ (CNMP, 0 ≤ x ≤ 0.06, y = 0, 0.01) phosphors with adjustable emission are synthesized. The X-ray diffraction and X-ray energy dispersive spectrometer measurement distinctly confirm the successful synthesis of CNMP: xDy³⁺, yTm³⁺ (CNMP, 0 ≤ x ≤ 0.06, y = 0, 0.01). The photoluminescence results reveal that CNMP: Dy³⁺ shows characteristic excitation peaks in the range of 350 to 450 nm, and mainly exhibits strong yellow emission around 575 nm ascribed to the ⁴F_9/2-⁶H_13/2 transitions of Dy³⁺. To compensate the deficiency of blue light emission of CNMP: Dy³⁺, the trivalent Tm³⁺ ion is co-doped owing to its characteristic blue emission at 450 nm due to its ¹D₂-³F₄ transitions. Therefore, the emission of CNMP: Dy³⁺, Tm³⁺ can be tuned from blue light region with CIE coordinates of (0.1649, 0.0387) to white light region with CIE coordinates of (0.3001, 0.3003) and finally moved to yellow light region with CIE coordinates of (0.3732, 0.4493) through adjusting the doping ratio of Dy³⁺ / Tm³⁺. The energy transfer efficiency and the energy transfer mechanism from Tm³⁺ to Dy³⁺ are further investigated. Moreover, CNMP: Dy³⁺, Tm³⁺ suffers a high thermal stability and the emission intensity still keeps 84 % of the initial intensity of Dy³⁺ at 230 ^oC. These outstanding properties show that Ca₁₉Na₂Mg(PO₄)₁₄: Dy³⁺, Tm³⁺ have great advantages and potentiality for applying in solid state lighting.

白光发射磷光体被广泛研究用于照明和显示领域。然而，差的热稳定性对于已知的单相白色磷光体是一个实际问题，这限制了它们的进一步应用。在本文中，钙₁₉的Na ₂的Mg（PO ₄）₁₄：X的Dy ³⁺，ÿ的Tm ³⁺（CNMP，0≤ X ≤0.06，ÿ = 0，0.01）具有可调节的发射磷光体合成。X射线衍射和X射线能谱仪的测量清楚地证明了CNMP的成功合成：x Dy ³⁺，y的Tm ³⁺（CNMP，0≤ X ≤0.06，ÿ = 0，0.01）。所述光致发光的结果表明CNMP：镝³⁺显示特性激发峰在350〜450nm的范围，并且主要表现出围绕575nm的强冲高黄色发射到⁴ ˚F _9/2 - ⁶ ħ _13/2的Dy转变^{3 +}。为了补偿的CNMP的蓝色发光的不足：镝³⁺，三价的Tm ³⁺离子是共掺杂由于在450nm其特性的蓝色发光，由于其¹ d ₂ - ³ ˚F ₄过渡。因此，可以将CNMP：Dy ³⁺，Tm ³⁺的发射从CIE坐标为（0.1649，0.0387）的蓝光区域调整为CIE坐标为（0.3001，0.3003）的白光区域，最后移至黄光区域通过调整Dy ³⁺ / Tm ³⁺的掺杂比例，使CIE坐标为（0.3732，0.4493）。进一步研究了Tm ³⁺到Dy ³⁺的能量转移效率和能量转移机理。而且，CNMP：Dy ³⁺，Tm ³⁺具有很高的热稳定性，并且发射强度在230 ^o仍保持Dy ³⁺初始强度的84％。C.这些优异的性质表明，Ca ₁₉ Na ₂ Mg（PO ₄）₁₄：Dy ³⁺，Tm ³⁺具有很大的优势和潜力，可用于固态照明。