Effects of Variation in Al Content on the Emission of Eu Doped CaAlSiN 3 Red Phosphor Synthesized by Combustion Synthesis Method for White LEDs

Effects of Al content on the formation and the photoluminescence properties of CaAlSiN :Eu phosphor (CASIN) were investigated by a combustion synthesis method. XRD (X-ray diffraction), combined with PL (photoluminescence), TEM-EDS (transmission electron microscope equipped with an energy-dispersive...

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Bibliographic Details
Published in:International journal of molecular sciences 2021-10, Vol.22 (20)
Main Authors: Huang, Shu-Chi, Chung, Shyan-Lung
Format: Article
Language:English
Subjects:
Aluminum - analysis
Aluminum - metabolism
Calcium - chemistry
Carbazoles - chemistry
Europium - chemistry
Luminescence
Luminescent Agents - chemistry
Phosphorus - chemistry
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Summary:Effects of Al content on the formation and the photoluminescence properties of CaAlSiN :Eu phosphor (CASIN) were investigated by a combustion synthesis method. XRD (X-ray diffraction), combined with PL (photoluminescence), TEM-EDS (transmission electron microscope equipped with an energy-dispersive X-ray spectroscope), and SAED (selected area electron diffraction) measurements, show that the bar-like CASIN gives a stronger emission than the plate-like and agglomerated fine particles. The emission intensity increases as the Al content increased from Al = 0.2 to Al = 0.8, which resulted from the extent of formation of CASIN increases. Then, the emission intensity decreases as the Al content is increased from Al = 0.8 to Al = 1.5, which resulted from the transformation of morphology of CASIN and a large amount formation of AlN. In addition, the extent of formation of CASIN increases with increasing Al from Al = 0.2 to Al = 1.2 and begins to decrease as Al is further increased to 1.5, and thus the peak emission wavelength increases from 647 nm to 658 nm as the Al molar ratio is increased from 0.2 to 1.2 and begins to decrease when further increasing the Al molar ratio to 1.5, which resulted from the large amount of AlN formed.
ISSN:1422-0067