Exciton peak energy

In sharp contrast to CuCl and CuBr, Cul exhibits a positive temperature dependence of the band gap mainly due to electron-phonon interaction. Gogolin et al. [10] studied the temperature dependence of exciton peak energies in Cul quantum dots (average radius = 6 nm) embedded in a glass matrix. The Zi,2 and Z3 exciton peaks of the zincblende type dots as well as Hi, H2 exciton peak in the hexagonal type dots both show a red shift upon heating. 

Fig. 4.1-117 InP. Energy gap and exciton peak energy vs. temperature from absorption and emission data [1.104]...

Table 3.3 Bound exciton peak energies (eV) in ZnO single crystals... 

Beyond the exciton peak in the far ultraviolet there is a series of other absorption features in MgO, which are more distinct in Fig. 9.5. These features, a theoretical treatment of which requires electron energy band calculations, are caused by maxima in the combined density of available states for electrons in the ground and excited states. 

Table 7.6. Comparison of band gap energies Es, exciton binding energies Exb, and 1LO and 2LO phonon energies hwilo and Ri lo, calculated from the PL peak energies of a ZnO single crystal (Eagle Picher) and a PLD ZnO thin film on a-plane sapphire at 2 K, as given in Fig. 7.20 [63]...

Fig. 7.26. Typical room temperature CL spectra of ZnO thin films grown at optimized O2, N2O, and N2 background gas pressure of 0.9mbar [89], The film grown in O2 shows splitting and broadening of the excitonic peak. Only the film grown in N2 shows nearly no green luminescence around 2.3 eV photon energy...

W/cm2. The FWHM of the strong peak (I2) was as small as 1.6 meV. The free-exciton peaks (A, B) could also clearly be observed. In addition, emission denoted by A2 in the higher energy region could clearly be seen and it is well-resolved into three peaks. FIGURE 5 shows a reflectance spectrum for the same sample at 5 K. Two sharp dispersive structures of A, B and C excitons can be seen. Furthermore, the first excited state (n = 2) transition of A and B excitons (A2, B2) can also be clearly observed. 

Fig. 12. Comparison of the calculated111 results for the band gap energy EG(R), the free exciton energy E0(R) - EB(R) and the self-trapped excition energy E0(R) - EB(R) - Ejxe (a = 0.8) with the differently polarized emission peak energies (from Ref. 113-115) for Mg[Pt(CN)4] 7 H2Q...

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