A 2D neodymium-germanate framework K6H4Nd2Ge6O20 with near-infrared luminescence introduction

This work synthesizes 2D layered K 6 H 4 Nd 2 Ge 6 O 20 via hydrothermal methods. Structural analysis reveals vertex-linked NdO 6 and GeO 4 /GeO 4 H units with interlayer K + and hydrogen bonding, while X-ray photoelectron spectroscopy (XPS) confirms the trivalent state of Nd ions. Correlative microscopy conclusively establish the correspondence between macroscopic lamellar morphology and the c-axis layered framework, with the c-axis dictating crystal growth. The compound exhibits intense Nd 3+ near-infrared (NIR) emission (1064 nm), showcasing potential for photonic applications and advancing rare-earth germanate design principles.