Promising Coloration Composite Strategy to Multicolor Photochromism for On‐Demand Information Displays

Abstract Multicolor photochromic materials are highly attractive in high‐end intelligent terminal products for on‐demand information displays. It is extremely challenging to realize multicolor photochromism by constructing multiple F‐centers in a single inorganic host through a traditional trap engineering strategy. Here, a promising design strategy is demonstrated to develop multicolor photochromism via manipulating chemical coloration (CC) in inorganic photochromics. To validate this, the colored BaMgSiO₄ is synthesized by adding different colorants (Co, Cr, Nd, etc.), displaying both bright chemical color and high photochromic efficiency with fast response speed to sunlight. Upon UV or sunlight irradiation, the photochromic coloration (PC) can effectively composite with CC, then achieving reversible multicolor chromism (deep blue to gray black @Co, dark green to reddish brown @Cr, pale purple to deep purple @Nd, etc.) and precise regulation of light response. The designed photochromic components exhibit on‐demand information display and UV detection, showing great potential in photochromic ceramic backplate and UV dosimetry. These results provide a new perspective for designing high‐quality multicolor systems, greatly enriching the aesthetic versatility and design flexibility in smart wearable devices.