In:
Digest Journal of Nanomaterials and Biostructures, Virtual Company of Physics, Vol. 15, No. 4 ( 2020-12), p. 1153-1164
Abstract:
In this study, a series of one-dimensional CaYAl3O7: Eu3+ and CaYAl3O7: Eu3+, R (R = Sm3+or Li+ , K+ , Na+ ) phosphors were synthesized by electrospinning. The formation, structure and photoluminescence properties of the phosphors were examined by thermogravimetric differential thermal analysis (TG-DTA), x-ray powder diff raction (XRD), scanning electron microscope (SEM) and photoluminescence spectroscopy (PL). The results show that one-dimensional materials with well crystallization were obtained, and the diffraction peaks of the samples are in good agreement of standard card (JCPDS: 49-0605). The emission spectrum is dominated by a red peak centered at 617 nm due to the 5D0 → 7F2 transition of Eu3+ ions. Concentration quenching occurs when the Eu3+ concentration is about 13 mol %, and the critical transfer distance of the phosphor is also calculated. With the increase of the concentration of doped Sm3+ ions, the luminescent intensity increased, and reached the maximum at the Sm3+ concentration of 10 mol %. The energy transfer processes between Sm3+ and Eu3+ is investigated in detail. Furthermore, Li+ , Na+ and K+ ions were designed as charge compensators to maintain the charge balance of CaYAl3O7: Eu3+, and the luminescence intensities can be eff ectively enhanced, especially by Li+ ion.
Type of Medium:
Online Resource
ISSN:
1842-3582
DOI:
10.15251/DJNB.2020.154
DOI:
10.15251/DJNB.2020.154.1153
Language:
Unknown
Publisher:
Virtual Company of Physics
Publication Date:
2020
detail.hit.zdb_id:
2568741-4
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