【摘要】 采用双掺杂(Yb3+/Ho3+)和多掺杂(Ho3+/Yb3+/Tm3+)方式,研究了氟化物中Yb3+对Ho3+,Tm3+的直接敏化上转换作用,并对它们在980nm激光激发下的上转换光谱特性进行了比较,对它们的上转换机理作了详细的讨论分析。观测到两处很强的上转换发光,分别是Yb3+/Ho3+共掺杂体系中5F45S2(Ho3+)→5I8(Ho3+)的荧光跃迁和Ho3+/Yb3+/Tm3+共掺杂体系中3H4(Tm3+)→3H6(Tm3+)的荧光跃迁。还发现由于添加了Tm3+,减弱了Yb3+/Ho3+共掺杂体系中Ho3+在可见光范围的上转换发光强度。更多还原

【Abstract】 The direct sensitization up-conversion processes from Yb³⁺ to Ho³⁺ and Tm³⁺ in fluoride were studied. The properties of the up-converted spectra of Yb³⁺/Ho³⁺ and Ho³⁺/Yb³⁺/Tm³⁺ co-doped fluorides pumped by a 980 nm laser were compared. Their （up-conversion） mechanism has been analyzed and discussed. Two strong up-conversion luminescence bands have been observed, which were the transitions of （）⁵F_<sub>4（）⁵S₂(Ho³⁺)→（）⁵I₈(Ho³⁺)in the Yb³⁺/Ho³⁺ co-doped fluoride system and （）³H₄(Tm³⁺)→（）³H₆(Tm³⁺) in the Ho³⁺/Yb³⁺/Tm³⁺ co-doped fluoride system. The addition of Tm³⁺ into Yb³⁺/Ho³⁺ co-doped fluoride decreases the up-converted emission intensities of Ho³⁺ in the visible region.更多还原