Synthesis of Sr<sub>6</sub>LuAl(BO<sub>3</sub>)<sub>6</sub>:Sm<sup>3+</sup> Red Phosphor with Excellent Thermal Stability and Its Application in w-LEDs

Synthesis of Sr<sub>6</sub>LuAl(BO<sub>3</sub>)<sub>6</sub>:Sm<sup>3+</sup> Red Phosphor with Excellent Thermal Stability and Its Application in w-LEDs

In this study, a series of Sr<sub>6</sub>LuAl(BO<sub>3</sub>)<sub>6</sub>:Sm<sup>3+</sup> red phosphors were successfully prepared with a high-temperature solid-phase technology. The Rietveld refinement analysis of the X-ray diffraction (XRD) diffracti...

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Bibliographic Details
Main Authors: Anlin Zhang, Yue Yang, Yuqing Peng, Hao Zhou, Wei Tang, Jianhong Jiang, Yiting Wu, Shiying Cai, Lianwu Xie, Bin Deng
Format: Article
Language:English
Published: MDPI AG 2024-11-01
Series:Molecules
Subjects:
borate
Sr<sub>6</sub>LuAl(BO<sub>3</sub>)<sub>6</sub>
Sm<sup>3+</sup>
luminescence
LEDs
Online Access:https://www.mdpi.com/1420-3049/29/23/5495
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Summary:In this study, a series of Sr<sub>6</sub>LuAl(BO<sub>3</sub>)<sub>6</sub>:Sm<sup>3+</sup> 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 <inline-formula><math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><semantics><mrow><mi>R</mi><mover accent="true"><mn>3</mn><mo>¯</mo></mover></mrow></semantics></math></inline-formula> space group of the hexagonal crystal system. Under 404 nm near-ultraviolet excitation, the Sr<sub>6</sub>LuAl(BO<sub>3</sub>)<sub>6</sub>:Sm<sup>3+</sup> 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 <sup>6</sup>H<sub>5/2</sub> → <sup>4</sup>F<sub>7/2</sub>. The optimum doping concentration of the Sr<sub>6</sub>LuAl(BO<sub>3</sub>)<sub>6</sub>:<i>x</i>Sm<sup>3+</sup> 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 (<i>T</i><sub>0.5</sub> > 480 K). Furthermore, the assembled white light-emitting diode (w-LED) device exhibits a low color temperature (5464 K), an excellent color rendering index (<i>R</i><sub>a</sub> = 95.6), and CIE coordinates (0.333, 0.336) close to those of standard white light. Collectively, these results suggest the enormous potential of Sr<sub>6</sub>LuAl(BO<sub>3</sub>)<sub>6</sub>:Sm<sup>3+</sup> phosphors for applications in w-LEDs.
ISSN:1420-3049

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