From CdPb₈(SeO₃)₄Br₁₀ to Pb₃(TeO₃)Br₄: the first tellurite bromide exhibiting an SHG response and mid-IR transparency

Herein, we report two new selenite/tellurite bromide compounds, namely, CdPb8(SeO3)(4)Br-10 and Pb-3(TeO3)Br-4. The former crystallized in a centrosymmetric space group, while the latter is a non-centrosymmetric compound. Specifically, CdPb8(SeO3)(4)Br-10 demonstrates high thermal stability (425 degrees C) and a wide optical transparency window (0.33-6.5 mu m), while Pb-3(TeO3)Br-4 exhibits an second harmonic generation response approximately equivalent to that of KDP, appropriate birefringence (0.095@532 nm and 0.066@1064 nm), wide optical transparency window (0.33-6.5 mu m) and high thermal stability (522 degrees C). These results indicated that lead tellurite bromides could be promising nonlinear optical material systems in the mid-IR wavelength.