Pr<sup>3+</sup>-Activated Sr<sub>2</sub>LaF<sub>7</sub> Nanoparticles as a Single-Phase White-Light-Emitting Nanophosphor

Pr<sup>3+</sup>-Activated Sr<sub>2</sub>LaF<sub>7</sub> Nanoparticles as a Single-Phase White-Light-Emitting Nanophosphor

Sr<sub>2</sub>LaF<sub>7</sub>:<i>x</i>Pr<sup>3+</sup> (<i>x</i> = 0.2, 1, 2, 3, 5, 10, and 25 mol%) nanophosphors with a cubic Fm3m structure were hydrothermally synthesized, forming nearly spherical nanoparticles with an average diameter o...

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Main Authors: Bojana Milićević, Aleksandar Ćirić, Katarina Milenković, Zoran Ristić, Jovana Periša, Željka Antić, Miroslav D. Dramićanin
Format: Article
Language:English
Published: MDPI AG 2025-05-01
Series:Nanomaterials
Subjects:
nanophosphor
fluorides
photoluminescence
Pr<sup>3+</sup> emission
light-based applications
Online Access:https://www.mdpi.com/2079-4991/15/10/717
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Summary:Sr<sub>2</sub>LaF<sub>7</sub>:<i>x</i>Pr<sup>3+</sup> (<i>x</i> = 0.2, 1, 2, 3, 5, 10, and 25 mol%) nanophosphors with a cubic Fm3m structure were hydrothermally synthesized, forming nearly spherical nanoparticles with an average diameter of approximately 32 nm. Diffuse reflectance measurement and excitation spectra showed a primary excitation peak of Pr<sup>3+</sup> at 443 nm, corresponding to the ground state to the <sup>3</sup>P<sub>2</sub> level transition. Upon blue light excitation, Pr<sup>3+</sup>-activated Sr<sub>2</sub>LaF<sub>7</sub> nanophosphors showed rich emission structure across the visible region of the spectrum, with blue (~483 nm), green (~525 nm), orange (~600 nm), and red (~640 nm) emissions, blue and orange being the most prominent ones. The relative intensities of these emissions varied with Pr<sup>3+</sup> concentration, leading to tunable emission colors. The chromaticity showed slight variation with the Pr<sup>3+</sup> content (0.350 < x < 0.417, 0.374 < y < 0.380), while the CCT value increased from 3118 K to 4901 K as the doping concentration increased. The optimized Sr<sub>2</sub>LaF<sub>7</sub> with 2 mol% Pr<sup>3+</sup> had the most intense emission with correlated color temperature (CCT) of 3628 K, corresponding to the warm white color. The proposed Pr<sup>3+</sup>-doping strategy offers valuable insights into discovering or optimizing single-phase phosphors for white-light-emitting applications.
ISSN:2079-4991

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