Far-red emission of CaYAlO4:Mn4+ synthesized by co-precipitation method

L. Q. Duong, N. V. Quang, D. H. Nguyen
Author affiliations

Authors

  • L. Q. Duong Advanced Institute for Science and Technology (AIST), Hanoi University of Science and Technology (HUST), 01 Dai Co Viet street, Ha Noi, Viet Nam
  • N. V. Quang Hanoi Pedagogical University 2, Phuc Yen, Ha Noi, Viet Nam
  • D. H. Nguyen Advanced Institute for Science and Technology (AIST), Hanoi University of Science and Technology (HUST), 01 Dai Co Viet street, Ha Noi, Viet Nam

DOI:

https://doi.org/10.15625/2525-2518/58/2/13960

Keywords:

CaYAlO4, Mn4 , far-red emitting phosphor, plant growth, LED

Abstract

Light absorption of the most plants is in range of blue (440 nm), deep-red (660 nm) and far-red around 700-740 nm. The deep-red and far-red light plays important roles in reactions of photomorphogenesis of plants. Although red emission phosphors have been researched extensively for white light-emitting diodes, deep-red and far-red emission phosphors for plant growth have been reported inadequately. Thus, in this work, far-red emitting CaYAlO4:Mn4+ phosphor was synthesized by co-precipitation method coupled with various annealing temperature from 800oC to 1300oC for 5 h. The crystal structure, morphology, and photoluminescence properties of CaYAlO4:Mn4+ phosphors were investigated in detail. The crystallinity of the phosphor belongs to tetragonal system with space group I4/mmm. Y3+ and Ca2+ ions are coordinated by nine oxygen atoms to form [YO9] and [CaO9] polyhedrons, and the Al3+ ions are coordinated by six oxygen atoms forming [AlO6] octahedrons that provided suitable sites for Mn4+ ions. The obtained sample showed an irregular surface morphology with micro size particles. Under the excitation of 320 nm, CaYAlO4:Mn4+ phosphors gave bright far-red emission around 710 nm due to the 2Eg4A2g transition of Mn4+ ions. The critical concentration of Mn4+ doped in CaYAlO4 host lattice is 0.5 mol.%. The results show that the CaYAlO4:Mn4+ phosphors may be applied to indoor plant growth illumination.

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Published

20-03-2020

How to Cite

[1]
L. Q. Duong, N. V. Quang, and D. H. Nguyen, “Far-red emission of CaYAlO4:Mn4+ synthesized by co-precipitation method”, Vietnam J. Sci. Technol., vol. 58, no. 2, pp. 168–175, Mar. 2020.

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Materials