Photoluminescent properties and Judd–Ofelt analysis of novel Na0.5Sr0.25NbO3: Eu3+ red phosphor with high quantum efficiency

Journal Article · Tue May 15 04:00:00 EDT 2018 · Materials Research Bulletin

DOI:https://doi.org/10.1016/J.MATERRESBULL.2018.01.044· OSTI ID:22803978

Shi, Yongsheng ^[1]; Quan, Bo; Ning, Qingju; Cao, Shuyao ^[2]; Shi, Jingjun; Dong, Chen ^[1]

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1. College of Electrical & Information Engineering, Shaanxi University of Science & Technology, Xi'an 710021, Shaanxi (China)
2. School of Materials Science and Engineering, Shaanxi University of Science & Technology, Xi'an 710021, Shaanxi (China)

Highlights: • The Na{sub 0.5}Sr{sub 0.25}NbO{sub 3}: Eu{sup 3+} phosphor with high quantum efficiency has been successfully synthesized by using a molten salt synthesis method. • The effect of the crystal field surrounding the Eu{sup 3+} ions on the luminescent performance was analyzed by the Judd–Ofelt theory. • Photoluminescent properties of Na{sub 0.5}Sr{sub 0.25}NbO{sub 3}: Eu{sup 3+} phosphor were investigated for the first time. - Abstract: We report on a novel Na{sub 0.5}Sr{sub 0.25}NbO{sub 3}: Eu{sup 3+} phosphor fabricated by a molten salt synthesis method with the potential application in white light-emitting diodes (WLEDs) as a red phosphor. The crystal structure, morphology, emission/excitation spectra, as well as decay curves were characterized with X-ray diffraction, Scanning Electron Microscope and photoluminescence spectrometer, respectively. Concentration quenching occurred when the concentration of Eu{sup 3+} was beyond 5 mol% due to the dipole-dipole interaction by nonradiative energy transfer. Besides, the effect of the crystal field surrounding the Eu{sup 3+} ions on the luminescent performance under 396 nm and 466 nm excitions has been investigated by the Judd–Ofelt theory. The result indicated that the quantum efficiency of the phosphor was 62.65% excited by 466 nm, which was superior to 41.43% excited by 396 nm. The optimal sample’s CIE coordinates were (0.6471, 0.3504) with the color purity of 97%, showing a potential application in (WLEDs) illumination field.

• OSTI ID: 22803978
• Journal Information: Materials Research Bulletin, Journal Name: Materials Research Bulletin Vol. 101; ISSN MRBUAC; ISSN 0025-5408
• Country of Publication: United States
• Language: English

Related Subjects

75 CONDENSED MATTER PHYSICS
SUPERCONDUCTIVITY AND SUPERFLUIDITY
COLOR
CONCENTRATION RATIO
CRYSTAL FIELD
CRYSTAL STRUCTURE
DIPOLES
ENERGY TRANSFER
EUROPIUM IONS
LIGHT EMITTING DIODES
MOLTEN SALTS
MORPHOLOGY
PH VALUE
PHOSPHORS
PHOTOLUMINESCENCE
QUANTUM EFFICIENCY
SCANNING ELECTRON MICROSCOPY
SPECTROMETERS
X-RAY DIFFRACTION