期刊
JOURNAL OF SOLID STATE CHEMISTRY
卷 328, 期 -, 页码 -出版社
ACADEMIC PRESS INC ELSEVIER SCIENCE
DOI: 10.1016/j.jssc.2023.124364
关键词
YSrZn3AlO7; Self-activated; Phosphor; Oxygen defect; WLED
In this study, a non-activated ion-doped full-spectrum emission phosphor using oxygen defect engineering for WLED lighting is proposed. The YMZn3AlO7 (M = Ca, Sr, Ba) phosphors with 114 '' structure were prepared via a high-temperature solid-state reaction. YSrZn3AlO7 exhibited the highest emission intensity and formed a wide yellow emission band. A theoretical model based on the designed oxygen vacancies was proposed to determine the self-activated luminescence mechanism. A warm WLED device with high color temperature and color rendering index was successfully prepared using YSrZn3AlO7 phosphor and a UV LED chip.
In this study, a non-activated ion-doped full-spectrum emission phosphor for white light-emitting diode (WLED) lighting is proposed using oxygen defect engineering. The YMZn3AlO7 (M = Ca, Sr, Ba) phosphors with 114 '' structure were prepared via a high-temperature solid-state reaction. Under excitation with 373 nm ultraviolet (UV) light, YSrZn3AlO7 in YMZn3AlO7 (M = Ca, Sr, Ba) exhibited the highest emission intensity and formed a wide yellow emission band centred at 563 nm. The full width at half maximum of the YSrZn3AlO7 phosphor was 172.6 nm. A theoretical model based on the designed oxygen vacancies was proposed to determine the self -activated luminescence mechanism. Density functional theory calculations revealed that oxygen vacancies lead to the generation of new energy levels. Electron paramagnetic resonance experiments further confirmed that the luminescence originated from oxygen vacancies. Eventually, a warm WLED device ((x, y) = (0.4057, 0.4359)) with a correlated color temperature of 3814 K and a relative color rendering index of 83 was successfully prepared using the YSrZn3AlO7 phosphor and a 365 nm UV LED chip. These results suggest that YSrZn3AlO7 is a promising WLED phosphor and provide new insights into the application of self-activated phosphors in WLED.
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