The development of extra-broadband emitting phosphors is challenging but meaningful work. So far, however, phosphors that can be effectively excited by GaN-based blue light-emitting diode (LED) chips and emit from visible (VIS) to near-infrared (NIR) regions are still rare. Herein, this study designs an extrabroadband VIS-NIR emitting phosphor with emission band ranging from 460 nm to 880 nm (bandwidth >400 nm) upon 450 nm excitation, owing to an efficient energy transfer from Ce 3+ to the red and NIR emitting Mn 2+ ions in Lu 2 BaAl 4 SiO 12 (LBAS) host. By the analysis of extended X-ray absorption fine structure (EXAFS) spectra and fluorescence lifetimes, it is demonstrated that the NIR emission most probably originates from those Mn 2+ occupying the dodecahedral sites with high symmetry rather than the exchange-coupled Mn 2+ -Mn 2+ pairs. Furthermore, two single-phase phosphor-converted LEDs are fabricated by combining blue LEDs with LBAS:Ce 3+ ,Mn 2+ phosphors, and thanks to the extra-broadband emission, the resultant devices may realize multifunctional applications, such as in high-quality general lighting, NIR spectroscopy, and plant growth lighting.

Lead‐based halide perovskite nanomaterials with excellent optical properties have aroused great attention in the fields of solar cells, light‐emitting diodes, lasing, X‐ray imaging, etc. However, the toxicity of lead prompts researchers to develop alternatives to cut down the usage of lead. Herein, all‐inorganic manganese‐based perovskite derivatives, CsMnCl3 nanocrystals (NCs), with uniform size and morphology have been synthesized successfully via a modified hot‐injection method. These NCs have a direct bandgap of 4.08 eV and a broadband emission centered at 660 nm. Through introducing modicum lead (1%) into the CsMnCl3 NCs, the photoluminescence intensity greatly improves, and the quantum yield (PLQY) increases from 0.7% to 21%. Furthermore, the CsMnCl3:1%Pb NCs feature high‐efficiency of X‐ray absorption and radioluminescence, which make these NCs promising candidates for X‐ray imaging.