通过水热法合成了单分散的六方相NaYF4∶5％ Ce3+,x％ Mn2+(摩尔分数,x =0,5,10,15)微米六棱柱.扫描电镜(SEM)分析表明,样品尺寸均匀,平均长度和平均高度约为2.02 μm和700 nm.NaYF4:5％Ce3,x％ Mn2+发光性质的研究结果表明,在激发谱中,245 nm的激发峰来自于Ce3+的4f→5d跃迁;332 nm的激发峰对应于Mn2+的6A1(6S)→4E(4D)跃迁和自陷激子(STE)的激发.在发射谱中,302和422nm的宽带发射峰分别对应Ce3+的5d→4f跃迁和基质中自陷激子的发光;538和587 nm的宽带发射峰分别对应Mn2+的4A1 (4G) →6A1(6S)跃迁和4T1(4G)→6A1 (6S)跃迁.随着Mn2+含量的增加,Ce3+的发射强度逐渐减弱,而Mn2+的538 nm(4A1(4G)→6A1(6S))发射峰强度逐渐增强,这表明在NaYF4基质中,存在Ce3+和Mn2+之间的能量传递.
Monodispersed 5％ Ce3 +,x％ Mn2 + (x =0,5,10,15) co-doped NaYF4 micro-sized hexagonal prisms were synthesized via the hydrothermal synthesis.The average diameter and height were about 2.02 μm and 700 nm,respectively.Upon ultraviolet excitation,5％ Ce3+,x％ Mn2+ co-doped hexagonal NaYF4 showed the excitation peaks at 245 and 332 nm in the excitation spectrum,attributing to the 4f→5d transition of Ce3+,6A1 (6S) →4E (4D) of Mn2 + and the excitation of self-trapped exciton of the host lattice,respectively.The emission peaks at 302,420,538,587 nm in the emission spectrum,corresponding to the 5d→4f transition of Ce3+,the emission of self-trapped exciton of the host lattice,4A1 (4G)→6A1 (6S) and 4T1 (4G)→6A1 (6S) of Mn2+,respectively.With increasing Mn2 + concentration,the emission intensity of Ce3 + and Mn2 + gradually decreased and increased,respectively,indicating the energy transfer from Ce3 + to Mn2+.
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