Forced Intergrowth of NaYS2 Phase in Sulfur‐Rich Environments with Fluorescence Remodeling of Upscaled Full‐Spectrum.

Optimization of the host lattice is a novel strategy to achieve efficient up‐conversion luminescence (UCL) with multi‐peak full‐spectrum emission. Herein, lattice optimization is performed in a non‐vacuum sulfur‐rich environment, where the ultra‐low phonon energy NaYS2 heterogeneous phase is forced to intergrow, which overcomes the limitations of the conventional vacuum preparation method and achieves high‐efficient UCL. Remarkably, the lattice sites are preferentially occupied by S2−, which causes lattice distortion and generates layered NaYS2/Y2O2S hybrid crystalline with high inversion asymmetry to reconfigure excitation mechanism and exhibit distinct luminescence centers at the multi‐peak full‐spectrum. Moreover, owing to longer lifetime of excited state energy levels of Er3+ after lattice modification and ordered segregation of Er3+ in the YS6 layer restricting the negative energy exchange process, the luminescence intensity is increased by about six times, and the remodeling of full‐spectrum‐efficient UCLs is realized. This work reports an innovative approach for lattice optimization and a facile preparation of ternary sulfides, which provides a new direction for achieving highly efficient UCLs with promising applications in biomedical imaging, near‐infrared detection, and temperature sensing synergy. [ABSTRACT FROM AUTHOR]