fig2
From: Energy transfer process, luminescence optimizing and various applications of lanthanide complexes
![Energy transfer process, luminescence optimizing and various applications of lanthanide complexes](https://image.oaes.cc/e008c222-3f82-40e0-903f-8258728d06ff/cs3035.fig.2.jpg)
Figure 2. Chemical structure of ion pair of Er(TTA)4(IR-806). This figure is used with permission from the American Chemical Society[18]. ET: Energy transfer.