Highly luminescent broadband phosphors based on acid solvent coordinated two-dimensional layered tin-based perovskites

Abstract

Lead-based perovskites which show remarkable photophysical characteristics have become revolutionary semiconductor materials in the optoelectronic field. However, the lead element in their chemical compositions limits their commercial application. Herein, ODASnBr₄ (ODA denotes protonated 1,8-octanediamine) was prepared by a facile room-temperature saturation recrystallization process. The effect of hydrobromic acid and hypophosphorous acid concentrations on the crystallization process and luminescence properties of ODASnBr₄ were discussed in detail. Excellent ODASnBr₄ with emission centered at 586 nm, an ultra-long photoluminescence (PL) lifetime (3.070 μs) and a high PL quantum yield of 98.22% was achieved. The white light-emitting devices (WLEDs) fabricated using ODASnBr₄ yellow phosphor and commercial blue phosphor realize tunable correlated color temperature. This study demonstrates that the two-dimensional layered lead-free ODASnBr₄ phosphor may be a potential candidate for strongly emitting and environmentally friendly nontoxic phosphor materials for WLED applications.