Luminescence properties of Mn4+-doped CaAl2O4 as a red emitting phosphor for white LEDs

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Thi Kim Chi Nguyen Duy Hung Nguyen Tan Vinh Le Thanh Vu Tran Chi Nguyen Vo Thi Kim Trung Pham

Abstract

A series of Mn4+-activated CaAl2O4 (CAO) compounds were synthesized by co-precipitation to seek a candidate for a red-emitting phosphor to be employed in a white LED. The crystal structure, morphology, and fluorescence properties of the as-obtained phosphors were investigated by X-ray diffraction (XRD), scanning electron microscopy (SEM), and photoluminescence (PL). The deep red luminescence of Mn4+ in CaAl2O4 is reported and discussed. The excitation spectrum exhibited broadband emission between 260 and 550 nm with three peaks dominating at 320 nm due to the transition of 4A2->4T1. The emission spectra between 600 to 720 nm displays an overwhelming emission peak at 654 nm owing to the 2E->4A2 transition of Mn4+ ion. This research demonstrates the great promise of CaAl2O4:Mn4+ as a commercial red phosphor in warm white LEDs and opens up new avenues for the exploration of novel non-rare-earth red-emitting phosphors.

DOI: https://doi.org/10.31276/VJSTE.63(3).03-07

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How to Cite
NGUYEN, Thi Kim Chi et al. Luminescence properties of Mn4+-doped CaAl2O4 as a red emitting phosphor for white LEDs. Vietnam Journal of Science, Technology and Engineering, [S.l.], v. 63, n. 3, sep. 2021. ISSN 2615-9937. Available at: <https://vietnamscience.vjst.vn/index.php/VJSTE/article/view/452>. Date accessed: 24 jan. 2022.
Section
PHYSICAL SCIENCES