Three Borates Belonging to the A(I)₇Ae(II)Re(III)₂B₁₅O₃₀ Family as Promising Nonlinear Optical Crystals

A bifunctional primitive strategy induces enhancements of large second harmonic generation and wide UV transmittance in rare-earth borates containing [B5O10] groups

“…The comparison of transmission ranges between these compounds and other developed RE borates containing [B 5 O 10 ] units is summarized in Table 1. 32–42 The favorable optical transmissibility yields large band gaps of approximately 6.00 eV and 6.30 eV for KBSBO and RSSBO, respectively, as determined by the Kubelka–Munk formula (inset of Fig. 3a and b), 43 which is consistent with the results of Tauc plots (Fig.…”

“…4c, RSSBO exhibits a notable improvement in SHG efficiency (2 × KDP), surpassing that of most deep UV rare earth borates containing [B 5 O 10 ] groups reported so far. 26,29,32–42 These observed attributes indicate the potential of KBSBO and RSSBO as beryllium-free deep UV nonlinear optical (NLO) crystals.…”