Mahalingam Venkataramanan, Naccache Rafik, Vetrone Fiorenzo, Capobianco John A
Indian Institute of Science Education and Research Kolkata, Mohanpur Campus, Mohanpur 741 252, India.
Opt Express. 2012 Jan 2;20(1):111-9. doi: 10.1364/OE.20.000111.
The white light emission of Tm3+/Yb3+/Ho3+-doped GdVO4 nanocrystals, following excitation with near-infrared light (λexc = 980 nm), via a multiphoton upconversion process is presented. Upconverted blue emission from the Tm3+ ions as well as green/red emissions from the Ho3+ ions contributes to the observed white light. The calculated Commission internationale de l'éclairage (CIE) color coordinates were calculated to be x = 0.34; y = 0.32 and lie at the center of the white region. Furthermore, the intensity of the upconverted white light was enhanced by the incorporation of monovalent Li+ ions into the GdVO4 matrix. An explanation for this enhancement is proposed based on X-ray diffraction and fluorescence lifetime measurements.
本文介绍了在近红外光（λexc = 980 nm）激发下，通过多光子上转换过程，掺Tm3+/Yb3+/Ho3+的GdVO4纳米晶体发出的白光。Tm3+离子的上转换蓝光发射以及Ho3+离子的绿/红光发射共同构成了观察到的白光。计算得到的国际照明委员会（CIE）颜色坐标为x = 0.34；y = 0.32，位于白色区域的中心。此外，通过将单价Li+离子掺入GdVO4基质中，上转换白光的强度得到了增强。基于X射线衍射和荧光寿命测量，对这种增强现象提出了一种解释。
