Promising green Sr5B3O9F: Ce3+/ Tb3+/Na+ phosphors for NUV-executable LED applications

Green phosphors such as Sr5-3(x+y)/2CexTbyB3O9F (x = 0.1, y = 0.4) and Sr5-x-y-zCexTbyNazB3O9F (x = 0.1, y = 0.4, z = 0.1, 0.4, 0.5) were prepared via solid-state reactions. The X-ray diffraction patterns of the obtained phosphors were examined to properly index their peak positions. Enhanced photol...

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Bibliographic Details
Published inJournal of alloys and compounds Vol. 834; p. 155094
Main Authors Yang, Sungjun, Park, Sangmoon
Format Journal Article
LanguageEnglish
Published Lausanne Elsevier B.V 05.09.2020
Elsevier BV
Subjects
Cerium
Color temperature
Diffraction patterns
Electron microscopes
Emission spectra
Excitation spectra
Green phosphor
Near ultraviolet radiation
NUV-LED
Phosphors
Photoluminescence
Quantum efficiency
Terbium
Ultraviolet spectra
X-ray diffraction
X-ray diffraction
Green phosphor
Quantum efficiency
NUV-LED
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Summary:Green phosphors such as Sr5-3(x+y)/2CexTbyB3O9F (x = 0.1, y = 0.4) and Sr5-x-y-zCexTbyNazB3O9F (x = 0.1, y = 0.4, z = 0.1, 0.4, 0.5) were prepared via solid-state reactions. The X-ray diffraction patterns of the obtained phosphors were examined to properly index their peak positions. Enhanced photoluminescence (PL) excitation and emission spectra were observed when Na+ and Ce3+ were co-doped into the Sr5B3O9F:Tb3+ phosphors. An intense green light due to the prepared phosphors was observed in the emission spectra upon near-ultraviolet (NUV) excitation. Scanning electron microscopy (SEM) images of the luminescent particles were obtained and the green emission light of a Sr4Ce0.1Tb0.4Na0.5B3O9F phosphor was compared to that of commercially available green phosphate and silicate phosphors. The thermal quenching of such phosphor occurred at 298–448 K. In addition, the internal quantum efficiency, color rendering index, correlated color temperature, and Commission Internationale de l’Eclairage coordinates were characterized for the Sr4Ce0.1Tb0.4Na0.5B3O9F phosphor using a 365 nm LED chip. [Display omitted] •Ce3+/Tb3+/Na+ co-doped Sr5B3O9F phosphors were prepared.•Predominant green emission was achieved.•Relative intensity of the phosphor was compared with commercial phosphors.•Luminescent properties of Sr4Ce0.1Tb0.4Na0.5B3O9F were explored.
ISSN:0925-8388
1873-4669
DOI:10.1016/j.jallcom.2020.155094