The synergistic effect of lead-free quantum dots and SnO2 in glass-ceramics for broadband white-emission

Abstract

All-inorganic lead-doped quantum dots (QDs) are widely used in various optoelectronic device materials due to their excellent optoelectronic properties. However, their poor stability and toxicity issues limit their further development. The glass-ceramic used as a carrier for Sn-doped QDs can overcome the bottleneck and maintain good luminescence properties as well. Here, lead-free perovskite QDs glass-ceramics with good performance in a borosilicate (B₂O₃–SiO₂–ZnO) system were successfully prepared using a high-temperature melting method. They exhibit high stability against moisture and high fluorescence efficiency with a quantum yield of over 50%. By changing the doping of the halide (F, Cl, Br) in the glass matrix, tunable emission colors of the QDs glass-ceramics were achieved. Furthermore, the self-crystallized CsSnBr₃ QDs glass-ceramics had good water stability, and maintained 72% of their initial fluorescence intensity in water after 40 days. The synergistic effect of lead-free QDs and SnO₂ in glass-ceramics also demonstrated an ultra-broadband emission spectrum (300–900 nm) with white light emission, indicating great prospects for white light-emitting diodes.