LAUSR

Laser‐driven lighting has been extensively studied, and it is of great significance to plan ahead for laser‐driven full‐spectrum sun‐like lighting, but there is a lack of corresponding color converters, especially cyan‐emitting ones. Herein, new Li2CaSiO4: Eu2+ (LCS: Eu2+) ceramics are fabricated, which produce cyan emission with a peak position of 482 nm and a full width at half maximum of 30 nm. These can be attributed to low electron‐phonon couple, individual lattice location of Eu2+ in a highly structural rigid host, and the incorporation of high relative density ceramic morphology. As a result, the best LCS: Eu2+ ceramic exhibits minimal internal quantum efficiency lossbrk (0.7 %), high relative density (97.7 %), superior thermal stability (92.3 % at 200 °C), hydrothermal stability (T90 > 1800 h), irradiation stabilities (≈100% under continuous 120 min violet laser irradiation at 86.7 mW·mm−2), and a luminous efficiency of 30.2 lm W−1. Correspondingly, a full‐spectrum laser‐driven lighting prototype is further constructed, demonstrating superior color rendering performance (Ra = 96.5, R5 = 98, R6 = 97) and remarkable hue retention (deviation ≤ 1) in the cyan region, outperforming YAG: Ce3+ and common high‐color‐rendering light sources. This exploration in cyan‐emitting ceramics is poised to facilitate the development of violet‐laser‐driven full‐spectrum lighting technology.