钨酸盐基白光LED红色荧光粉的制备及发光性能研究

摘要：白光LED具有节能、环保、寿命长等优点，而被视为是下一代的照明光源。目前，由蓝光芯片+YAG:Ce3+实现白光发射的LED已经实现商业化。然而，这种组合由于缺少红光组分，导致色温偏高，显色指数偏低。因此高稳定、高效率的红色荧光粉亟待开发。本论文通过固相反应合成法，制备了Eu3+离子掺杂的NaLaMgWO6钨酸盐复合钙钛矿结构荧光粉，并通过X射线衍射（XRD）、扫描电镜（SEM）、光致发光图谱、热稳定性测试、量子效率等表征收段，对其物相结构、微观形貌及发光性能进行了研究及分析。主要的研究内容有：74957

（1）研究Eu3+离子掺杂浓度对NaLaMgWO6:Eu3+系列荧光粉的发光强度的影响。发现随着Eu3+离子掺杂浓度的逐渐增加，NaLaMgWO6:Eu3+系列荧光粉的红光发光强度（465nm激发下的616nm处的发射）逐渐增强。当Eu3+离子的掺杂浓度达到40%时，NaLaMgWO6:Eu3+系列荧光粉的红光发光强度达到最高，表明Eu3+离子的最佳掺杂浓度为40%。

（2）研究反应时间对NaLaMgWO6:Eu3+系列荧光粉的发光强度的影响。发现随着煅烧时间增加，NaLa0。6MgWO6:0。4Eu3+系列荧光粉在激发波长465nm下，616nm位置处红光的发光强度先显著增强，后趋于平缓。

（3）研究球磨时间对NaLaMgWO6:Eu3+系列荧光粉的发光强度的影响。发现随着球磨时间的增加，NaLa0。6MgWO6:0。4Eu3+荧光粉红光发光强度随之增强。

（4）研究Mo离子掺杂浓度对NaLa0。6MgWO6:0。4Eu3+荧光粉的发光性能的影响。发现随着Mo掺杂量的升高，杂峰出现。随着Mo掺杂浓度的逐渐增加，NaLa0。6Mg（W1-yMoy）O6:0。4Eu3+(0≤y≤1)系列荧光粉的红光发光强度逐渐降低，且CTB（电荷迁移带）部分明显展宽及红移。

通过与商用Y2O3:Eu3+、YAG:Ce3+、（Sr, Ca）AlSiN3:Eu2+荧光粉的发光性能比较（如发光强度、荧光热稳定性、量子效率等）进行比较，本论文制备的NaLaMgWO6:Eu3+荧光粉的部分性能表现优于现有商业荧光粉，实验结果表明其具有在白光LED中应用的潜在价值。

毕业论文关键词：白光发光二极管；钨酸盐；红色荧光粉；Eu3+离子掺杂；光致发光

Preparation and Luminescent Properties of Tungstate Red Phosphor for White-light-emitting LED Application

Abstract: White LED is considered as the next generation light source because of its advantages such as energy saving, environmental protection, long life and so on。 At present, white-light-emitting LED composed by the blue chip and YAG:Ce3+ has been commercialized。 However, this type of white light has poor color rendering index (CRI) because of the color deficiency in the red and green region。 Therefore, red phosphors with high stability and high efficiency urgently required。 In this paper, NaLaMgWO6 type phosphor doped by the Eu3+ ion is prepared by solid phase reaction method。 The structure, microstructure and luminescence properties of this phosphor was characterized by X-ray diffraction (XRD), scanning electron microscopy (SEM), photoluminescence (PL), thermal stability test and quantum efficiency and so on。 The main research contents are:

(1) Study the PL intensity of NaLaMgWO6:Eu3+ phosphor controlled by the optimization of Eu3+ ions doping concentration。 The PL intensity of NaLaMgWO6:xEu3+ phosphor was gradually enhanced with the increase of Eu3+ ion doping concentration (λexc = 465 nm; λem = 616 nm)。 The optimum doping concentration of Eu3+ was found to be 40% (in mol%)。

(2) Study the PL intensity influence of NaLaMgWO6:Eu3+ series phosphor optimized by the different reaction time。 With the increase of sintering time, the PL intensity of this series phosphor at the excitation wavelength of 465nm was significantly increased at 616nm。钨酸盐基白光LED红色荧光粉的制备及发光性能研究:http://www.youerw.com/cailiao/lunwen_85710.html