Er3+，Er3+/Yb3+掺杂氟化镧超微材料的光谱特性与上转换发光

采用共沉淀法制备了Er³⁺掺杂和Er³⁺/Yb³⁺共掺杂LaF₃超微材料，所制备的样品的颗粒呈球形，尺寸为250nm左右.计算得到Er³⁺单掺杂样品中对应着⁴S_3/2和⁴F_9/2能级的发光量子效率分别为67.0%和71.9%.研究发现，随着Yb³⁺离子浓度的增加关键词：3+')" href="#">Er³⁺3+')" href="#">Yb³⁺发光能量传递

Luminescence properties and upconversion of Er3+ doped and Er3+/Yb3+ co-doped LaF3 particles

Er³⁺ doped and Er³⁺/Yb³⁺ co-doped superfine LaF₃ powders are prepared using co-precipitation method. The sample shows spherical particles with size of about 250 nm. The quantum efficiencies of ⁴S_3/2 and ⁴F_9/2 levels in the prepared Er³⁺ doped LaF₃ powders are calculated to be 67.0% and 71.9%, respectively. With the enhancement of the Yb³⁺ doping concentration, The upconvertion intensity increases as a function of excitation power more slowly due to the enhancement of the sensitization of Yb³⁺ to Er³⁺. The Er³⁺-Er³⁺ interaction is also reinforced as the Yb³⁺ concentration increases. This leads to the increase of the ratio of the green emission to the red one with the enhancement of Yb³⁺ concentration.