Abstract
Broadband near-infrared (NIR) phosphor-conversion light-emitting diode (pc-LED) devices have an extensive application prospect in night vision monitoring, nondestructive testing, and biomedical imaging. In this work, the ultra-broadband NIR emission produced by the chromium-activated NaZn(PO3)3 phosphor with two-site occupation peaks at around 900 nm with a full width at half-maximum (FWHM) of 218 nm. Time-resolved spectroscopic techniques and steady-state fluorescence spectra coupled with crystal structure confirm the multiple occupations of the chromium ion. Notably, the NaZn(PO3)3: Cr3+ phosphors exhibit an internal quantum efficiency (IQY) of 80.6 % and an external quantum efficiency (EQY) of 35.4 %, which may originate from the activators confinement, direct band-gap property, and high absorbance. To better comprehend the connection between structure and luminescence capabilities, the band structure, crystal field strength parameters, fluorescence lifetime, and thermal stability were all thoroughly investigated. Finally, the optimal sample has demonstrated its application in the quantitative analysis of ethanol/water mixtures. The results provide a novel perspective for the rational design of desired emitters.
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