Thermally robust and valence-variation-induced white-light emission of a novel stannate phosphor Sr 3 Al 10 SnO 20 :Dy 3+ : crystal structure, luminescence property, and mechanism investigation

The development of novel white-light-emission phosphors is of great importance for applications in lighting and display fields. Trivalent Dy 3+ is widely used as a potential luminescence center for white-light emission. However, Dy 3+ -doped phosphors often suffer a poor yellow to blue ratio due to the deficiency of its 4 F 9/2 → 6 H 15/2 transition, low luminescence efficiency, and unsatisfactory thermal stability. The importance of the present research work is that we have achieved a tunable white light in a single phased stannate phosphor Sr 3 Al 10 SnO 20 :Dy 3+ with robust thermal stability. The crystal structure, phase purity, and chemical composition were investigated via X-ray diffraction Rietveld structure refinement, scanning electron microscopy, and energy dispersive spectrometry. The luminescence spectra indicated that Sr 3 Al 10 SnO 20 :Dy 3+ not only exhibited characteristic 4 F 9/2 → 6 H J/2 (J=11, 13, and 15) inherent transition emissions of Dy 3+ , but also showed an abnormal blue band emission, which was identified through X-ray photoelectric spectroscopy as the T 1 → S 0 transitions of Sn 2+ , resulting from the valence variation of Sn 4+ . The efficient energy transfer from Sn 2+ to Dy 3+ was also confirmed and the transfer efficiency was calculated. Owing to the valence-variation-induced emission of Sn 2+ , a tunable white light could be realized from a cool to warm white light region, with Commission Internationale de l'Eclairage coordinates and a correlative color temperature varying from (0.277, 0.333) and 8634 K to (0.353, 0.404) and 4913 K, respectively. The luminescent and defects formation mechanism as well as the luminescence kinetics were further investigated. Moreover, Sr 3 Al 10 SnO 20 :Dy 3+ had a high quantum efficiency (∼34.6%) and a super-stable thermal stability behavior (82.5% at 240 °C of the initial integral emission intensity at 30 °C) with a large activation energy (Δ E ∼ 0.1654 eV). Finally, a charge-compensation test was performed to further verify the effect of defects on the luminescence property and the related mechanism was discussed. The current work provides a novel method to achieve tunable white-light emission in Dy 3+ single-doped phosphors and the related mechanism is effectual for other rare earths for potential applications in lighting and display fields.