fig5
From: Energy transfer process, luminescence optimizing and various applications of lanthanide complexes
Figure 5. Mechanism of [YbEu] assembly for DL (λex = 365 nm) and UCL (λex = 980 nm). This figure is used with permission from Wiley-VCH GmbH[24]. ISC: Intersystem crossing; DL: downshifting luminescence; UCL: upconversion luminescence.
