Comparative study of optical and structural properties of electrospun 1-dimensional CaYAl3O7:Eu3 + nanofibers and bulk phosphor
- Authors
- Yim, Chul Jin; Unithrattil, Sanjith; Chung, Woon Jin; Im, Won Bin
- Issue Date
- Sep-2014
- Publisher
- ELSEVIER SCIENCE INC
- Keywords
- Electrospinning; MEM analysis; Red phosphor; Nano-phosphor
- Citation
- MATERIALS CHARACTERIZATION, v.95, pp.27 - 35
- Indexed
- SCIE
SCOPUS
- Journal Title
- MATERIALS CHARACTERIZATION
- Volume
- 95
- Start Page
- 27
- End Page
- 35
- URI
- https://scholarworks.bwise.kr/hanyang/handle/2021.sw.hanyang/159112
- DOI
- 10.1016/j.matchar.2014.06.002
- ISSN
- 1044-5803
- Abstract
- We report the optical and structural studies of Eu3+-doped 1-dimensional CaYAl3O7 nano-fiber phosphor. CaYAl3O7:Eu3+ phosphors were synthesized by electrospinning technique and the pristine nano-fibers were annealed at 900 degrees C to form well crystallized uniform fibers. Under ultraviolet excitation, the CaYAl3O7:Eu3+ exhibited red emission, due to transitions in the 4f states of Eu3+. In order to explore the difference between the quantum efficiency of nano-fiber and bulk CaYAl3O7:Eu3+ phosphor, detailed structural and optical analyses were carried out. The structural analysis of the CaYAl3O7:Eu3+ nano-fibers indicates that the structural environment surrounding the dopant Eu3+ 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.
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