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首页> 外文期刊>Physica, B. Condensed Matter >Cooperative energy transfer in Tb3+/Yb3+- and Nd3+/Yb3+/Tb3+-codoped oxyfluoride glasses
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Cooperative energy transfer in Tb3+/Yb3+- and Nd3+/Yb3+/Tb3+-codoped oxyfluoride glasses

机译：Tb3 + / Yb3 +-和Nd3 + / Yb3 + / Tb3 +掺杂的氟氧化物玻璃中的协同能量转移

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This paper reports on cooperative energy transfer and upconversion luminescence properties of Tb3+/Yb3+ - and Nd3+/Yb3+/Tb3+-codoped oxyfluoride glasses. Upon excitation with a 980 nm laser diode, an intense green upconversion luminescence along with weak ultraviolet (UV)-visible emissions has been observed in Yb3+/Tb3+-codoped oxyfluoride glasses. Power dependence of UV-visible upconversion luminescence intensity has been examined, revealing that a cooperative energy transfer mechanism from Yb3+ ions is responsible for the excitation of Tb3+ ions. Meanwhile, it is noticed that Tb3+ upconversion emission bands have also been clearly detected at 487, 542, 587 and 620nm in Nd3+/Yb3+/Tb3+-codoped oxyfluoride glasses upon excitation with a 808 nm laser diode. The quadratic dependence of the upconversion luminescence on the pump-laser power indicates two-photon process for the population of Tb3+:D-5(4) state via Nd3+ -> Yb3+ -> Tb3+ energy transfer. However, no emission has been observed in the oxyfluonde glasses codoped with Yb3+/Tb3+ or Nd3+/Tb3+, respectively, upon excited at a 808 nm laser diode. A proposed upconversion mechanism involving energy transfer from Nd3+ to Yb3+, and then a cooperative energy transfer process from two excited Yb3+ to Tb3+ has been presented.
机译：本文报道了掺Tb3 + / Yb3 +-和掺Nd3 + / Yb3 + / Tb3 +的氟氧化物玻璃的协同能量转移和上转换发光特性。在用980 nm激光二极管激发后，在掺Yb3 + / Tb3 +的氟氧化物玻璃中观察到了强烈的绿色上转换发光以及弱的紫外线（UV）可见光发射。已检查了紫外可见上转换发光强度的功率依赖性，揭示了来自Yb3 +离子的协同能量转移机制是Tb3 +离子激发的原因。同时，注意到在掺有Nd3 + / Yb3 + / Tb3 +的氟氧化物玻璃中，在被808nm激光二极管激发后，还可以在487、542、587和620nm处清楚地检测到Tb3 +上转换发射带。上转换发光对泵浦激光功率的二次依赖性表明，通过Nd3 +-> Yb3 +-> Tb3 +能量转移，Tb3 +：D-5（4）态的种群为双光子过程。然而，在以808nm激光二极管激发时，在分别掺有Yb3 + / Tb3 +或Nd3 + / Tb3 +的氧氟玻璃中没有观察到发射。提出了一种上转换机制，涉及从Nd3 +到Yb3 +的能量转移，然后从两个激发的Yb3 +到Tb3 +的协同能量转移过程。

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