Synthesis of Sr6LuAl(BO3)6:Sm3+ Red Phosphor with Excellent Thermal Stability and Its Application in w-LEDs

Molecules. 2024 Nov 21;29(23):5495. doi: 10.3390/molecules29235495.

Abstract

In this study, a series of Sr6LuAl(BO3)6:Sm3+ red phosphors were successfully prepared with a high-temperature solid-phase technology. The Rietveld refinement analysis of the X-ray diffraction (XRD) diffraction patterns indicated that the as-prepared phosphors belong to the R3¯ space group of the hexagonal crystal system. Under 404 nm near-ultraviolet excitation, the Sr6LuAl(BO3)6:Sm3+ phosphor exhibits narrowband emission within the range of 550 to 750 nm. The primary emission peak is observed at a wavelength of 599 nm, corresponding to 6H5/24F7/2. The optimum doping concentration of the Sr6LuAl(BO3)6:xSm3+ phosphor is 10 mol%. Nearest-neighbor ion interaction is the mechanism of concentration quenching. The synthesized phosphors demonstrate exceptional thermal stability, with a high quenching temperature (T0.5 > 480 K). Furthermore, the assembled white light-emitting diode (w-LED) device exhibits a low color temperature (5464 K), an excellent color rendering index (Ra = 95.6), and CIE coordinates (0.333, 0.336) close to those of standard white light. Collectively, these results suggest the enormous potential of Sr6LuAl(BO3)6:Sm3+ phosphors for applications in w-LEDs.

Keywords: LEDs; Sm3+; Sr6LuAl(BO3)6; borate; luminescence.

Grants and funding

This work was supported by the Scientific Research Program of Hunan Provincial Department of Education (22C0561), School Level Scientific Research Project of Xiangnan University (2022JX10), Hunan Provincial Natural Science Foundation Joint Program (2023JJ50388), the Natural Science Foundation of Hunan Province, China (2023JJ31000), the ‘Keming Foods’ Scientific Innovation Fund for Post-graduates of Central South University of Forestry and Technology (2024KMCX018, 2024KMCX019), and Home for researchers (www.home-for-researchers.com).