Li(Na,K)Ba(Sr,Ca)B9O15∶Eu3+荧光粉的制备及发光性能

采用高温固相法在空气气氛下合成了一系列Eu³⁺掺杂硼酸盐基质荧光粉。用X射线衍射、荧光光谱以及色坐标等手段对荧光粉的晶相和发光性能进行表征。通过LiBaB₉O₁₅中的碱金属以及碱土金属之间的相互取代,研究了基质组成的改变对荧光粉发光性能的影响。结果表明,在Li(Na,K)Ba(Sr,Ca)B₉O₁₅∶0.07Eu³⁺系列荧光粉中,LiSrB₉O₁₅∶0.07Eu³⁺荧光粉的发光强度最强。考察了煅烧温度、保温时间和Eu³⁺掺杂量对LiSrB₉O₁₅∶Eu³⁺荧光粉晶相和发光性能的影响,煅烧温度为750 ℃,保温时间为1~5 h时,样品的结晶性均良好。Eu³⁺掺杂量为0.52时,LiSrB₉O₁₅∶Eu³⁺荧光粉的发光强度最强。当x≥0.42(x=0.42,0.47,0.52,0.57)时,LiSrB₉O₁₅∶xEu³⁺色坐标均接近标准红光(0.67,0.33)。比较了LiSrB₉O₁₅∶xEu³⁺(x=0.02~0.57)荧光粉的611 nm(⁵D₀→⁷F₂)和586 nm(⁵D₀→⁷F₁)处发射峰相对强度比值R,R值变化不大,说明多数Eu³⁺在晶格中处于非反演对称中心的格位;比较了LiSrB₉O₁₅∶0.52Eu³⁺荧光粉和商用Y₂O₃∶Eu³⁺荧光粉的发光特性,在260 nm波长激发下,LiSrB₉O₁₅∶0.52Eu³⁺荧光粉的发光强度弱于Y₂O₃∶Eu³⁺荧光粉;在362 nm和394 nm波长激发下,LiSrB₉O₁₅∶0.52Eu³⁺荧光粉的发光强度强于Y₂O₃∶Eu³⁺荧光粉。

Synthesized and Luminescent Properties of Li(Na,K)Ba(Sr,Ca)B9O15∶Eu3+ Phosphor

A series of Eu³⁺-doped borate-based phosphors were synthesized by high temperature solid-state method in air atmosphere. The crystal phase and luminescence properties of phosphors were characterized by X-ray diffraction, fluorescence spectroscopy and chromaticity coordinates. Through the mutual substitution between alkali metals and alkaline earth metals in the LiBaB₉O₁₅, the effect of the change of the matrix composition on the luminescence properties of phosphors was investigated. In the series of Li(Na, K)Ba(Sr, Ca)B₉O₁₅∶0.07Eu³⁺phosphors, LiSrB₉O₁₅∶0.07Eu³⁺phosphor has the strongest emission intensity. The effects of calcination temperature, holding time and Eu³⁺ doping concentration on the crystal phase and luminescence properties of LiSrB₉O₁₅∶Eu³⁺ phosphor were investigated. When the calcination temperature is 750 ℃ and holding time is 1~5 h, the crystallinity of all the samples is good. When the Eu³⁺ doping concentration is 0.52, LiSrB₉O₁₅∶Eu³⁺ phosphor has the strongest luminescence intensity. When x≥0.42(x=0.42, 0.47, 0.52, 0.57), the color coordinates of LiSrB₉O₁₅∶xEu³⁺ are close to the standard red light (0.67, 0.33). The relative intensity ratio R of the emission peak at 611 nm (⁵D₀→⁷F₂) and 586 nm (⁵D₀→⁷F₁) of LiSrB₉O₁₅∶xEu³⁺(x=0.02~0.57) phosphors were compared. R value is not changed obviously, the majority of Eu³⁺ in the crystal lattice locates in inversion symmetry center sites. The luminescence properties of the LiSrB₉O₁₅∶0.52Eu³⁺ phosphor and the commercial Y₂O₃∶Eu³⁺ phosphor were compared, the luminescence intensity of LiSrB₉O₁₅∶0.52Eu³⁺phosphor is weaker than Y₂O₃∶Eu³⁺ phosphor under excitation of 260 nm wavelength, stronger than Y₂O₃∶Eu³⁺ phosphor under excitation of 362 nm and 394 nm wavelength.