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

Authors

  • Thi Kim Chi Nguyen* Advanced Institute for Science and Technology, Hanoi University of Science and Technology; College of Natural Sciences, Can Tho University
  • Duy Hung Nguyen Advanced Institute for Science and Technology, Hanoi University of Science and Technology; College of Natural Sciences, Can Tho University
  • Tan Vinh Le College of Natural Sciences, Can Tho University
  • Thanh Vu Tran College of Natural Sciences, Can Tho University
  • Chi Nguyen Vo College of Natural Sciences, Can Tho University
  • Thi Kim Trung Pham College of Natural Sciences, Can Tho University

Keywords:

CaAl2O4:Mn4 , co-precipitation, phosphors

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

Classification number

2.1

Downloads

Published

2022-03-28

Received 6 January 2020; accepted 3 April 2020

How to Cite

Thi Kim Chi Nguyen, Duy Hung Nguyen, Tan Vinh Le, Thanh Vu Tran, Chi Nguyen Vo, & Thi Kim Trung Pham. (2022). Luminescence properties of Mn4+-doped CaAl2O4 as a red emitting phosphor for white LEDs. Vietnam Journal of Science, Technology and Engineering, 63(3), 3-7. https://doi.org/10.31276/VJSTE.63(3).03-07

Issue

Section

Physical Sciences