Enhanced quantum yield of yellow photoluminescence of Dy{sup 3+} ions in nonlinear optical Ba{sub 2}TiSi{sub 2}O{sub 8} nanocrystals formed in glass
- Department of Materials Science and Technology, Nagaoka University of Technology, 1603-1 Kamitomioka-cho, Nagaoka 940-2188 (Japan)
Transparent crystallized glasses consisting of nonlinear optical Ba{sub 2}TiSi{sub 2}O{sub 8} nanocrystals (diameter: {approx}100 nm) are prepared through the crystallization of 40BaO-20TiO{sub 2}-40SiO{sub 2}-0.5Dy{sub 2}O{sub 3} glass (in the molar ratio), and photoluminescence quantum yields of Dy{sup 3+} ions in the visible region are evaluated directly by using a photoluminescence spectrometer with an integrating sphere. The incorporation of Dy{sup 3+} ions into Ba{sub 2}TiSi{sub 2}O{sub 8} nanocrystals is confirmed from the X-ray diffraction analyses. The total quantum yields of the emissions at the bands of {sup 4}F{sub 9/2}{yields}{sup 6}H{sub 15/2} (blue: 484 nm), {sup 4}F{sub 9/2}{yields}{sup 6}H{sub 13/2} (yellow: 575 nm), and {sup 4}F{sub 9/2}{yields}{sup 6}H{sub 11/2} (red: 669 nm) in the crystallized glasses are {approx}15%, being about four times larger compared with the precursor glass. It is found that the intensity of yellow (575 nm) emissions and the branching ratio of the yellow (575 nm)/blue (484 nm) intensity ratio increase largely due to the crystallization. It is suggested from Judd-Ofelt analyses that the site symmetry of Dy{sup 3+} ions in the crystallized glasses is largely distorted, giving a large increase in the yellow emissions. It is proposed that Dy{sup 3+} ions substitute Ba{sup 2+} sites in Ba{sub 2}TiSi{sub 2}O{sub 8} nanocrystals. - Grapical abstract: This figure shows the photoluminescence spectra of Dy{sup 3+} ions in the range of 450-700 nm obtained in the quantum field measurements for the precursor BTS and crystallized (at 770 and 790 deg. C, for 30 min) glasses. The wavelength of the excitation light was 352 nm. By incorporating into Ba{sub 2}TiSi{sub 2}O{sub 8} nanocrystals, the emission intensity of the yellow band of Dy{sup 3+} ions is largely enhanced. This would give an impact in the science and technology of photoluminescence materials.
- OSTI ID:
- 21212185
- Journal Information:
- Journal of Solid State Chemistry, Vol. 182, Issue 2; Other Information: DOI: 10.1016/j.jssc.2008.10.028; PII: S0022-4596(08)00563-X; Copyright (c) 2008 Elsevier Science B.V., Amsterdam, The Netherlands, All rights reserved; Country of input: International Atomic Energy Agency (IAEA); ISSN 0022-4596
- Country of Publication:
- United States
- Language:
- English
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