Y2O3:Yb3+,Tm3+纳米材料的可见及紫外上转换发光

通过燃烧法制备了Yb³⁺-Tm³⁺共掺的Y₂O₃纳米粉体,并对样品在980 nm激光照射下的上转换发光特性进行了研究.实验发现,样品在可见光区域能够产生强烈的蓝色发光(476 nm和487 nm)和较弱的红色发光(约650 nm),而且同时观察到了两个紫外发光峰¹I₆→³H₆ (~297 nm)和^{1关键词：2O₃:Yb3+')" href="#">Y₂O₃:Yb3+3+}')" href="#">Tm³⁺上转换光谱敏化紫外发光

Visable and ultraviolet upconversion luminescences of Y2O3:Yb3+,Tm3+ nanomaterials

The Y₂O₃:Yb³⁺,Tm³⁺ nanomaterials are prepared by a combustion method. The sample is excited by 980 nm, thereby producing a bright blue emission transition peak (476 nm and 487 nm) and a weak red emission peak(about 650 nm) that can be clearly observed. More important two ultraviolet emission peaks ¹I₆→³H₆ (~297 nm) and ¹D₂→³H₆ (~363 nm) are found. In addition, the change of upconversion emission intensity dependent on the Yb³⁺ concentrations was recorded and the possible eauses are discussed. Finally, the pump energy dependences of the emission intensity are investigated. The results show that blue and red emissions originate from a three-photon process and ultraviolet emission peak (363 nm) takes its source at a four-photon process.