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- Title
Splitting and broadening of the emission bands of Y<sub>2</sub>O<sub>3</sub>:Eu<sup>3+</sup>,Nd<sup>3+</sup> and its dependence on Nd<sup>3+</sup> concentration and annealing temperature.
- Authors
Wangdong Liu; Hanchao Wang; Shiping Zhan; Wenbin Li
- Abstract
Although Eu3+ ion-doped Y2O3 has been extensively used as red phosphors, their color rendering needs to be improved for high-quality illumination and displaying. Here, we show that the emission spectra of Y2O3:Eu3+ red phosphors can be broadened by the doping of Nd3+ ion so that the color rendering capability of Y2O3:Eu3+ was remarkably enhanced. Y2O3:Eu3+ and Y2O3: Eu3+,Nd3+ colloidal spheres were synthesized by wet chemical procedure and high-temperature treatment. The fluorescence measurement under the 254 and 380 nm ultraviolet excitation indicates that the 612 nm red emission peak of Eu3+ can be splitted into two ones by the doping of Nd3+ ion, of which the full width at half maximum (FWHM) is broadened from 4.2 nm to 9.6 nm. By varying the concentration of Nd3+ ion, it was determined that the optimal doping concentration of Nd3+ ion is of 3 mol% for realizing the strongest emission intensity. The further increase of Nd3+ ion exceeding 3 mol% would lead to a concentration quenching phenomenon. The analysis based on XRD spectra and the simplified energy diagram suggested that the doped Nd3+ ion not only monitored the growth dynamics, but also took an efficient energy transfer and a cross relaxation process to generate intense emission from Eu3+ ion in both of C2 and S6 sites, instead of preferable one type of Eu3+ site (C2 or S6) in the Nd3+ undoped sample.
- Subjects
ANNEALING of metals; TEMPERATURE; PHOSPHORS; ENERGY transfer; CARBON
- Publication
Journal of Materials Science, 2011, Vol 46, Issue 23, p7620
- ISSN
0022-2461
- Publication type
Article
- DOI
10.1007/s10853-011-5739-6