Simultaneous improving luminescence intensity and stability of Cs4PbBr6:SCN-/Er3+ through molecular-level regulation and photosensitive resin encapsulating by 3D printing

Abstract

Although perovskites have many excellent optoelectronic properties, their instability has always been a key factor limiting their commercial applications. Here, this study focuses on combining the density functional theory (DFT), SCN^-/Er³⁺ codoping, and three-dimensional printing (3D printing) to regulate Cs₄PbBr₆ at the molecular-level to simultaneously improve luminescence intensity and stability. Subsequently, Cs₄PbBr₆:SCN^-/Er³⁺ with excellent luminescent properties was obtained by adjusting the ratio of SCN^- and Er³⁺, and further applied to white light emitting diodes (WLEDs) and indoor photovoltaics (IPVs). Surprisingly, luminescent materials coated with resin remains at a relatively high value of luminescence stability after continuous UV irradiation for 8 hours and after 6 months in air. Based on the above advantages, we can not only obtain 3D printed WLED device with a color rendering index (CRI) of 94 and a correlated color temperature (CCT) of 5771 K, but also customize a range of ultra-stable fluorescent patterns. Under dark conditions, the constructed LED device illuminates the silicon solar cell, generating stable output photocurrent and excellent photoelectric conversion efficiency. Therefore, the successful combination of DFT calculations, SCN^-/Er³⁺ codoping, and 3D printing technology in this study has enabled us to solve some bottleneck problems in the field of perovskite.