Yb3+敏化的Er3+/Ho3+共掺碲酸盐玻璃的上转换发光研究

用高温熔融法制备了系列Er³⁺/Yb³⁺共掺，Ho³⁺/Yb³⁺共掺，和Er³⁺/Yb³⁺/Ho³⁺三掺碲酸盐玻璃，在975nm激光抽运下三种掺杂玻璃中都出现了较强的绿光和红光上转换.研究了Yb³⁺离子对Er³⁺和Ho³⁺离子上转换发光强度的影响以及Yb³⁺→Er关键词： 3+/Yb³⁺/Ho³⁺共掺')" href="#">Er³⁺/Yb³⁺/Ho³⁺共掺 碲酸盐玻璃 光谱性质 上转换

Upconversion luminescence in Yb3+ sensitized Er3+/Yb3+-codoped tellurite glasses

A series of Er³⁺/Yb³⁺-codoped，Ho³⁺/Yb³⁺-codoped，and Er³⁺/Yb³⁺/Ho³⁺-triply doped tellurite glasses were prepared by high-temperature melting. Under 975nm laser light excitation，intense green and red upconversion luminescence was observed in all the three kinds of codoped tellurite glasses. The influence of Yb³⁺ ions on the upconversion emission properties of Er³⁺ and Ho³⁺ ions was investigated as well as the energy transfer efficiencies of Yb³⁺→Er³⁺ and Yb³⁺→Ho³⁺. Upconversion luminescence mechanisms of Er³⁺ and Ho³⁺ sensitized by Yb³⁺ in tellurite glasses were discussed. When the concentrations of Er³⁺ and Ho³⁺ ions were fixed at low values，the intensity of green and red upcoversion emission in Er³⁺/Yb³⁺/Ho³⁺-triply doped tellurite glasses increases with increasing Yb₂O₃ content, which are due to the interaction overlap of Er³⁺：⁴S_3/2→⁴I_15/2 and Ho³⁺：⁵S₂(⁵F₄)→⁵I₈ transitions，Er³⁺：⁴F_9/2→⁴I_15/2 and Ho³⁺：⁵F₅→⁵I₈ transitions，respectively. In Er³⁺/Yb³⁺/Ho³⁺-triply doped tellurite glasses，the upconversion luminescence mechanisms were affected by the interaction energy transfers of Er³⁺/Yb³⁺, Ho³⁺/Yb³⁺ and Er³⁺/Ho³⁺. The cross-relaxation between Er³⁺ and Ho³⁺ enhances the upconversion emission intensities of Ho³⁺ in the visible region.