A detailed nondestructive analytical method for quantitative food analysis was established by using a selffabricated NIR-LED light source combined with Mg 3 Ga 2 GeO 8 (MGGO) phosphor and a blue LED chip in one package, which can be integrated into smartphones. The phosphor of MGGO:Cr 3+ exhibits ultra-broadband NIR emission in the range of 650−1200 nm, which matches well with the overtones of molecular vibrations (e.g., O−H, C−H, and N−H) presented in food composition. The detailed crystal structure of MGGO was investigated by powder XRD Rietveld refinements, HRTEM images, and the corresponding SAED. Luminescence properties based on different Cr 3+ ions positions were investigated according to Gaussian peak fitting. Owing to the NIR response to organic elements, the working curves between absorbance and water content as well as sugar degree of pears and bananas were plotted. Then the reliability and veracity of the nondestructive analytical method were evaluated (R 2 = 0.9988). All the results suggest that the ultra-broadband NIR emission of MGGO:Cr 3+ phosphor has potential application as light sources integrated into smartphones for nondestructive food analysis.

Near-infrared luminescent materials have attracted considerable interest because of their excellent performance in the field of optical imaging.

Smart luminescent materials with tangible and reversible responses to external stimuli have gained popularity for multiple applications. However, impracticable stimuli and less adaptability render them unfit for real‐life applications. Here, a proton competitive binding‐based molecular system is reported, which demonstrates, both in solution and solid state, remarkable responses toward light illumination and temperature variation. Small change in solvent composition could result in remarkable variation in measurable temperature range at least from −80 to 60 °C. Combination of light illumination and temperature change enables multilevel anti‐counterfeiting, as well as construction of easy‐to‐use and high‐resolution liquid thermometers. The key components in the concerned molecular system are a newly designed fluorophore, NI‐CBN, a four‐coordinated boron derivative of naphthalimide (NI), and an organic fluoride salt that is tetrabutylammonium fluoride (TBAF). Reaction between NI‐CBN and TBAF yields a dynamic fluorophore, NI‐CBN‐F, which shows remarkable color change to the stimuli via proton migration between the imine group in NI‐CBN and the fluoride anion of the salt. Such responses enable the aforementioned advanced anti‐counterfeiting and visible temperature monitoring.