Such in situ PL spectrum

and mapping indicate strong localization and oscillation of photon propagation along the longitudinal axis. This behavior is a typical coupled optical multi-cavity. Figure 5 PL spectra and corresponding emission mapping images. (a) Pure ZnSe, (b) ZnSeMn, (c), , and (d) nanobelt, respectively. The insets are the corresponding bright-field optical and dark-field emission images. The red curve in (d) is the fitted PL spectrum. (e) The PL of each individual emission band in (c). (f) PL mapping images of individual emission sub-band in (d). The scale is 4 μm. The growth conditions can be adjusted to obtain PARP inhibitor another nanobelt. Figure 6a is the SEM image and EDS of the nanobelt with lower Mn concentration (0.39%). Figure 6b is the dark-field emission image of single nanobelt with 0.39% Mn content, which also shows the optical waveguide characteristic. The inset is the corresponding bright-field optical image. Figure 6c is the corresponding far-field PL spectrum. The PL spectrum contains near-band edge emission of ZnSe with weak intensity and transition emission of Mn2+ with strong intensity. Compared with Figure 5d,

the split of Mn2+ emission in Figure 6c is not evident. We can distinguish Enzalutamide cost ambiguously that the Mn2+ emission split into many narrow sub-bands with a smaller periodic span (about 2 nm). The PL mapping is carried out for individual sub-bands to see if there are integrated multi-cavities in the nanobelt (Figure 6d). We can see that the band of 552 nm distributes homogeneously

in the whole nanobelt. The sub-bands of 584, 630 and 670 nm distribute almost at two sides of the nanobelt. The excited photon emits at the side and end of the nanobelt usually after scattering at the boundary many times [33]. The optical multi-cavity phenomenon is not evident, although MTMR9 it still exists in the nanobelt due to the incontinuous emission intensity distribution at the two sides. The reduced Mn content can reduce the impurity and trapped state in the nanobelt and then affect the cavity quality greatly. Therefore, both dopant and micro-cavity play an important role in the multi-modes emission. Figure 6 Characterization of another nanobelt with low Mn 2+ concentration (0.39%). (a) SEM image and EDS. (b) Dark-field emission image. The inset is the corresponding bright-field optical image. (c) The corresponding PL spectrum. (d) The corresponding PL mapping images of individual emission sub-bands. The scale is 10 μm. Conclusions We synthesized pure and Mn-doped ZnSe nanobelts successfully using thermal evaporation method. Mn can dope effectively into ZnSe crystal when MnCl2 or Mn(CH3COO)2 were used as dopants in the source material. EDS mapping indicates that the distribution of Mn is inhomogeneous in the nanobelt. All of these doped nanobelts grew along the <111> direction.