La2O3:Sm3+纳米发光材料的燃烧法合成及其性能研究

Study on Synthesis and properties of nano luminescent materials La2O3:Sm3+ by combustion method

摘要:

通过燃烧法制备了La2O3:Sm3+纳米材料，用XRD和TEM对其形貌结构进行了表征和分析，并研究了其发光性质。结果表明：La2O3:Sm3+纳米材料为六角结构，颗粒尺寸大约为34 nm; Sm3+的掺杂引起其衍射峰的位置发生略微的右移； Sm3+的本征激发带位于411 nm左右；在近紫外光（411 nm）的激发下，观察到 4G5/2 → 6H5/2 (568 nm)、 4G5/2 → 6H7/2 (611 nm, 强度最高) 和 4G5/2 → 6H9/2 (654 nm)三个主发射峰；发射光谱表明La2O3:Sm3+中Sm3+离子的格位对称性较低；材料样品的衰减寿命约为202 us，色度坐标大约为(0.5849, 0.4143)。

Abstract:

Nanomaterials La2O3:Sm3+was prepared by combustion synthesis. The morphology and structure were characterized and analyzed by TEM and XRD. The luminescent properties were also investigated. The results were indicated that the mean particle size of La2O3:Sm3+ nanomaterials with hexagonal structure were approximately 34 nm. Because of the Sm3+ doping, the position of diffraction peaks of La2O3:Sm3+ moved to the right slightly; It was observed that intrinsic excitation band of Sm3+ was located in around 411 nm; Under the 411 nm excitation, the major emission peaks at 4G5/2 → 6H5/2 (568 nm)，4G5/2 → 6H7/2 (611 nm, the highest intensity) and 4G5/2 → 6H9/2 (654 nm) were observed. The emission spectrum indicated the location of the Sm3+ ions were asymmetric. The decay lifetime of the Sm3+ ions was about 202 μs; The chromaticity coordinate was approximately (0.5849, 0.4143).