【摘要】 采用共沉淀工艺合成了Yb³⁺离子和Ho³⁺离子共掺杂的Lu₂O₃纳米粉体,研究了粉体的斯托克斯（Stokes）和反斯托克斯（Anti-Stokes）发光特性以及煅烧温度对粉体发光性能的影响.在氙灯447.5nm和半导体激光器980nm激发下样品均发射出明亮的绿光,观察到了不同Ho³⁺离子浓度掺杂的纳米粉体的浓度淬灭现象.发射强度与激发功率的关系表明Anti-Stokes发光是双光子过程,能量转移是主要的上转换机制.Ho³⁺离子的⁵F₄,⁵S₂能级在不同波长激发下的衰减时间也证实了浓度淬灭及能量转移现象.更多还原

【Abstract】 A series of Lu₂O₃ nanopowders co-doped with Yb³⁺and Ho³⁺were synthesized by co- precipitation method.The Yb³⁺concentration is 1mol% and the Ho³⁺concentration ranges from 0.5mol% to 10mol%.The Stokes and Anti-Stokes spectroscopic properties of the prepared nanopowders were investigated,together with the relative intensities of Stokes and Anti-Stokes PL spectra dependence on the powders calcined at different temperatures.Strong green emissions were observed under the excitation of 447.5nm（Xenon Lamp）and 980nm（Laser Diode）,respectively.Concentration quenching occurrs with the increase of Ho³⁺concentration.Power studies reveal that a two-photon process is involved in the Anti-Stokes emissions and the possible upconversion mechanisms are energy transfer from Yb³⁺to Ho₃₊.Concentration quenching and energy transfer process are confirmed by the decay time of the ⁵F₄,⁵S₂ level under the excitation of different pump wavelength.更多还原