Acta Physica Sinica, Год журнала: 2024, Номер 73(15), С. 157803 - 157803
Опубликована: Янв. 1, 2024
Phosphors-converted near-infrared LED (pc-NIR LED) possesses applications in various fields including food quality analysis, night vision, biomedical imaging, and biomedicine. The design development of broadband (NIR) phosphors with the required properties are decisive significance for pc-NIR devices. Cr<sup>3+</sup> doped considered to be most promising materials commercialization. Broadband NIR luminescent have attracted more attention due their potential light sources. However, emission wavelength phosphor is generally located I region less than 850 nm, realizing II still a challenge. In this work, series Na<sub>3</sub>YSi<sub>3</sub>O<sub>9</sub> new silicate prepared by solid-state method N<sub>2</sub> atmosphere at 1150 ℃ 8 h. We take advantages nature multi octahedral sites suitable studied redshift broaden spectrum. phase, crystal structure, microstructure, photoluminescence, main peak decay thermal stability samples systematically studied. results show that pure phases, uneven morphology, slight agglomeration, sizes micrometer range. weak field environment lattice, <i>Dq</i>/<i>B</i> value 2.29. Under excitation blue 485 strongest peaks Na<sub>3</sub>Y<sub>1–<i>x</i></sub> Si<sub>3</sub>O<sub>9</sub>:<i>x</i> 984 nm (NIR region), which longer those activated phosphors. Due multi-site occupation full width half maximum (FWHM) spectrum as high 183 nm. optimal doping concentration 3%, quenching mechanism dipole-dipole interaction between ions. Fluorescence curves luminescence lifetime Na<sub>3</sub>Y<sub>0.97</sub>Si<sub>3</sub>O<sub>9</sub>:0.03Cr<sup>3+</sup> sample gradually decreases increase temperature. temperature-dependent spectra intensity temperature range from 298 K 423 K, activation energy Δ<i>E</i> 0.157 eV.
Язык: Английский