Energy Transfer Enables 1.53 μm Photoluminescence from Erbium-Doped TiO<sub>2</sub>Semiconductor Nanocrystals Synthesized by Ar/O<sub>2</sub>Radio-Frequency Thermal Plasma
作者:Ji-Guang Li、Xiaohui Wang、Chengchun Tang、Takamasa Ishigaki、Shigeru Tanaka
DOI:10.1111/j.1551-2916.2008.02318.x
日期:2008.6
Highly crystalline, highly luminescent nanopowders of Er3+‐doped TiO2 have been successfully synthesized via one‐step Ar/O2 radio‐frequency thermal plasma processing. Energy transfer from the TiO2 host to Er3+ activators has been confirmed by combined means of UV‐vis, excitation, and photoluminescence spectroscopies. As a consequence, bright photoluminescence at ∼1.53 μm was observed from the nanopowders either by directly exciting the Er3+ activator or by exciting the TiO2 host lattice. A comparative study shows that the nanopowder of the same system made via coprecipitation lacks the energy transfer. The plasma‐generated nanopowders may thus find applications in optoelectronic devices.
通过一步氩/氧气射频热等离子体处理,成功合成了高结晶性和高发光性的Er³⁺掺杂TiO₂纳米粉末。结合紫外-可见吸收光谱、激发光谱和光致发光光谱等手段,证实了TiO₂基质向Er³⁺激活剂的能量传递。因此,无论是直接激发Er³⁺激活剂,还是激发TiO₂基质晶格,纳米粉末均在约1.53 μm处呈现出明亮的光致发光。对比研究表明,相同体系的纳米粉末通过共沉淀方法制备时缺乏能量传递。因此,这种等离子体产生的纳米粉末可能在光电设备中找到应用。