Comparative study of optical and structural properties of electrospun 1-dimensional CaYAl{sub 3}O{sub 7}:Eu{sup 3+} nanofibers and bulk phosphor

Journal Article · Mon Sep 15 00:00:00 EDT 2014 · Materials Characterization

DOI:https://doi.org/10.1016/J.MATCHAR.2014.06.002· OSTI ID:22403535

Yim, Chul Jin; Unithrattil, Sanjith ^[1]; Chung, Woon Jin ^[2]

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1. School of Materials Science and Engineering, Chonnam National University, 300 Yongbong-dong, Buk-gu, Gwangju 500-757 (Korea, Republic of)
2. Division of Advanced Materials Engineering, Kongju National University, Cheonan, Chungnam 330-717 (Korea, Republic of)

We report the optical and structural studies of Eu{sup 3+}-doped 1-dimensional CaYAl{sub 3}O{sub 7} nano-fiber phosphor. CaYAl{sub 3}O{sub 7}:Eu{sup 3+} phosphors were synthesized by electrospinning technique and the pristine nano-fibers were annealed at 900 °C to form well crystallized uniform fibers. Under ultraviolet excitation, the CaYAl{sub 3}O{sub 7}:Eu{sup 3+} exhibited red emission, due to transitions in the 4f states of Eu{sup 3+}. In order to explore the difference between the quantum efficiency of nano-fiber and bulk CaYAl{sub 3}O{sub 7}:Eu{sup 3+} phosphor, detailed structural and optical analyses were carried out. The structural analysis of the CaYAl{sub 3}O{sub 7}:Eu{sup 3+} nano-fibers indicates that the structural environment surrounding the dopant Eu{sup 3+} ion was more unstable in nano-fiber when compared to a bulk sample. Decay curves for both the samples when fitted with double exponential decay model indicate that the nano-fiber has shorter decay time, arising from the larger contribution from the non-radiative decay, due to defect levels introduced in the host lattice. - Highlights: • Synthesis of red nano-phosphor through electrospinning • Luminescence properties of bulk and nano-phosphors are compared. • Inferior emission intensity of the nano-phosphor is analyzed using MEM. • Charge cloud around nano-phosphor was found to be oblique.

• OSTI ID: 22403535
• Journal Information: Materials Characterization, Vol. 95; Other Information: Copyright (c) 2014 Elsevier Science B.V., Amsterdam, The Netherlands, All rights reserved.; Country of input: International Atomic Energy Agency (IAEA); ISSN 1044-5803
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
75 CONDENSED MATTER PHYSICS
SUPERCONDUCTIVITY AND SUPERFLUIDITY
ALUMINATES
ANNEALING
CALCIUM COMPOUNDS
COMPARATIVE EVALUATIONS
CRYSTAL DEFECTS
CRYSTAL LATTICES
DIAGRAMS
DOPED MATERIALS
EUROPIUM IONS
EXCITATION
LUMINESCENCE
NANOFIBERS
PHOSPHORS
QUANTUM EFFICIENCY
SYNTHESIS
ULTRAVIOLET RADIATION
YTTRIUM COMPOUNDS