CAJ | 학술논문

通过水热法成功合成了直径约为3 nm 的NaYF4∶Yb,Er 超细纳米晶.荧光光谱测试表明,其发射波长位于660 nm 的单带红光,其杂质光的含量低于1/99．6.机理研究表明超细纳米晶的尺寸效应产生的表面高能量振动声子和激发光子的高表面散射率导致4 F7/2能级上的电子通过消耗基质声子能量而向下弛豫到4 S3/2和2 H 11/2的概率大大降低,而主要通过4 F7/2＋4 I11/2-2×2 F9/2跃迁过程布居4 F9/2能级,从而实现强红光发射.
통과수열법성공합성료직경약위3 nm 적NaYF4∶Yb,Er 초세납미정.형광광보측시표명,기발사파장위우660 nm 적단대홍광,기잡질광적함량저우1/99．6.궤리연구표명초세납미정적척촌효응산생적표면고능량진동성자화격발광자적고표면산사솔도치4 F7/2능급상적전자통과소모기질성자능량이향하이예도4 S3/2화2 H 11/2적개솔대대강저,이주요통과4 F7/2＋4 I11/2-2×2 F9/2약천과정포거4 F9/2능급,종이실현강홍광발사.
NaYF4 ∶ Yb3 + ,Er3 + ultrathin nanocrystals with average diameter of about 3 nm were successfully synthesized by hydrothermal method.The fluorescent spectra indicate that the sample emits single-red band light with impurity emission lower than 1/99.6.The mechanism analysis indicates that the size-effect leads to the surface high energy oscillation phonons and high scattering probability of excitation photons,which leads to the depopulation probability of 4 F7/2 states to 4 S3/2 and 2 H 1 1/2 states decreases greatly while the4 F7/2 +4 I1 1/2 -2 ×2 F9/2 transition was remarkalbly enhanced.As a result,the intense red emission was realized.