Yuan Mao-Hui, Fan Hai-Hua, Li Hui, Lan Sheng, Tie Shao-Long, Yang Zhong-Min
Guangdong Provincial Key Laboratory of Nanophotonic Functional Materials and Devices, School of Information and Optoelectronic Science and Engineering, South China Normal University, Guangzhou 510006, China.
School of Chemistry and Environment, South China Normal University, Guangzhou 510006, China.
Sci Rep. 2016 Feb 22;6:21091. doi: 10.1038/srep21091.
We reported the first observation of the two-photon-induced quantum cutting phenomenon in a Gd(3+)/Tb(3+)-codoped glass in which two photons at ~400 nm are simultaneously absorbed, leading to the cascade emission of three photons in the visible spectral region. The two-photon absorption induced by femtosecond laser pulses allows the excitation of the energy states in Gd(3+) which are inactive for single-photon excitation and enables the observation of many new electric transitions which are invisible in the single-photon-induced luminescence. The competition between the two-photon-induced photon cascade emission and the single-photon-induced emission was manipulated to control the luminescence color of the glass. We demonstrated the change of the luminescence color from red to yellow and eventually to green by varying either the excitation wavelength or the excitation power density.
我们报道了在掺钆（Ⅲ）/铽（Ⅲ）玻璃中首次观察到双光子诱导的量子切割现象，其中在约400nm处的两个光子被同时吸收，导致在可见光谱区域级联发射三个光子。飞秒激光脉冲诱导的双光子吸收使得钆（Ⅲ）中对单光子激发无活性的能态被激发，并能够观察到许多在单光子诱导发光中不可见的新的电跃迁。通过控制双光子诱导的光子级联发射与单光子诱导发射之间的竞争来调控玻璃的发光颜色。我们通过改变激发波长或激发功率密度，证明了发光颜色从红色变为黄色并最终变为绿色。
