Detecting the origin of luminescence in Er³⁺-doped hexagonal Na_1.5Gd_1.5F₆ phosphors

Abstract

Understanding site-selective fluorescence is one of valuable importance for spectrum modulation. In this Letter, we observed the existence of two non-equivalent Gd-activated crystallographic sites in an ${\mathrm{Er}}^{3+}$-doped hexagonal ${\mathrm{Na}}_{1.5}{\mathrm{Gd}}_{1.5}{\mathrm{F}}_6$ phosphor. It is proved that two green emissions from the ${}^4{\mathrm{S}}_{3/2}$ level separately originate from the Gd1 (540 nm) and Na2/Gd2 (550–555 nm) crystallographic sites, and the 657 nm red emission from the ${}^4{\mathrm{F}}_{9/2}$ level only originates from Na2/Gd2 site through using the time-resolved luminescence spectra. The 142.2% absolute enhancement of the red emission is realized through the synergistic effect of ultraviolet downconversion and infrared upconversion induced by the 370 nm and 1.54 μm dual-mode excitation.

© 2016 Optical Society of America

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