Yao Yunhua, Xu Cheng, Zheng Ye, Yang Chengshuai, Liu Pei, Jia Tianqing, Qiu Jianrong, Sun Zhenrong, Zhang Shian
State Key Laboratory of Precision Spectroscopy, East China Normal University , Shanghai 200062, People's Republic of China.
State key Laboratory of Silicon Materials, Zhejiang University , Hangzhou, 310027, People's Republic of China.
J Phys Chem A. 2016 Jul 21;120(28):5522-6. doi: 10.1021/acs.jpca.6b04444. Epub 2016 Jul 12.
The upconversion luminescence of rare-earth ions has attracted considerable interest because of its important applications in photoelectric conversion, color display, laser device, multiplexed biolabeling, and security printing. Previous studies mainly explored the upconversion luminescence generation through excited state absorption, energy transfer upconversion, and photon avalanche under the continuous wave laser excitation. Here, we focus on the upconversion luminescence generation through a nonresonant multiphoton absorption by using the intense femtosecond pulsed laser excitation and study the upconversion luminescence intensity control by varying the femtosecond laser phase and polarization. We show that the upconversion luminescence of rare-earth ions under the intense femtosecond laser field excitation is easy to be obtained due to the nonresonant multiphoton absorption through the nonlinear interaction between light and matter, which is not available by the continuous wave laser excitation in previous works. We also show that the upconversion luminescence intensity can be effectively controlled by varying the femtosecond pulsed laser phase and polarization, which can open a new technological opportunity to generate and control the upconversion luminescence of rare-earth ions and also can be further extended to the relevant application areas.
稀土离子的上转换发光因其在光电转换、彩色显示、激光器件、多重生物标记和安全印刷等方面的重要应用而备受关注。以往的研究主要探索了在连续波激光激发下通过激发态吸收、能量转移上转换和光子雪崩产生上转换发光。在此，我们聚焦于利用强飞秒脉冲激光激发通过非共振多光子吸收产生上转换发光，并研究通过改变飞秒激光相位和偏振来控制上转换发光强度。我们表明，在强飞秒激光场激发下，由于光与物质之间的非线性相互作用导致的非共振多光子吸收，稀土离子的上转换发光很容易获得，而这在以往的连续波激光激发工作中是无法实现的。我们还表明，通过改变飞秒脉冲激光相位和偏振可以有效控制上转换发光强度，这可为产生和控制稀土离子的上转换发光开辟新的技术机遇，并且还可进一步扩展到相关应用领域。
