A Spectrally Programmable Liquid‐State Active System for High‐Performance (SPLASH) Multicolor Lasing and White Emission

Abstract The development of a Spectrally Programmable Liquid‐State Active System for High‐performance (SPLASH) is introduced, which allows for multicolor lasing and White Emission. This completely liquid, three‐phase device showcases exceptional tunability within a singular Liquid Crystal Cell (LCC). Components include a Coumarin 540 (CM540)‐doped liquid crystal (LC) mesophase, an ionic liquid (RTIL) richly endowed with Rhodamine 6G (R6G) dye, and a Stilbene 420 (SB420)‐infused water‐based solution. This device displays significant accomplishments in multicolor tunability through the use of both lasing and fluorescence mechanisms. As a result, White Light Fluorescence (WFluo) and White Light Hybrid‐Emission (WHE) are showed, which consist of two lasing bands and one fluorescence. This is achieved in a liquid‐state environment characterized by phase separation and careful device management. Additionally, due to its fluid‐like nature and compact design, the device inherently offers considerable scalability — since its components can be easily adjusted and rearranged. This approach promises ground‐breaking advancements in high‐impact applications such as the Li‐Fi concept. Therefore, SPLASH stands out as an innovative platform for White Light Fluorescence (WFluo) and Multicolor Lasing (ML) within liquid‐state active systems.