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Tb3+ and Eu3+ co-doped Ba6Bi9B79O138: color-tunable phosphors by utilizing the host-sensitization effect of Bi3+ and enhancement of red emission upon heating.
- Source :
- New Journal of Chemistry; 3/7/2017, Vol. 41 Issue 5, p2037-2045, 9p
- Publication Year :
- 2017
-
Abstract
- A series of Tb<superscript>3+</superscript> and Eu<superscript>3+</superscript> co-doped Ba<subscript>6</subscript>Bi<subscript>9</subscript>B<subscript>79</subscript>O<subscript>138</subscript> (BBBO) phosphors were prepared by high-temperature solid-state reactions in order to utilize the host-sensitization effect of Bi<superscript>3+</superscript>. Energy transfer processes from Bi<superscript>3+</superscript> in the host to both Tb<superscript>3+</superscript> and Eu<superscript>3+</superscript>, as well as from Tb<superscript>3+</superscript> to Eu<superscript>3+</superscript> were proved. Under UV-excitation, three emissions can be simultaneously observed in a single-phase phosphor, including a blue band attributed to Bi<superscript>3+</superscript> emission in the host, green lines due to Tb<superscript>3+</superscript> transitions of <superscript>5</superscript>D<subscript>4</subscript>→<superscript>7</superscript>F<subscript>J</subscript> (J = 6, 5, 4, 3), and red lines due to Eu<superscript>3+</superscript> transitions of <superscript>5</superscript>D<subscript>0</subscript>→<superscript>7</superscript>F<subscript>J</subscript> (J = 1, 2, 3, 4). Thus, the total emission could be rationally tuned by varying the relative doping contents of Tb<superscript>3+</superscript>/Eu<superscript>3+</superscript> and by selecting appropriate exciting irradiation. Thermal stability was investigated by in situ PL spectra at elevated temperatures. It is quite interesting to observe a significant enhancement of red emission in both BBBO:0.05Eu<superscript>3+</superscript> and BBBO:0.05Tb<superscript>3+</superscript>,0.005Eu<superscript>3+</superscript> excited at 279 nm. Especially in the latter case, the red emission intensity at 150 °C is roughly 3 times that at room temperature, which is explained by the increasing efficiency of Bi<superscript>3+</superscript>→ Eu<superscript>3+</superscript> and Tb<superscript>3+</superscript>→ Eu<superscript>3+</superscript> energy transfer upon annealing. [ABSTRACT FROM AUTHOR]
- Subjects :
- CHEMICAL synthesis
PHOSPHORS
BARIUM compounds
HIGH temperature chemistry
Subjects
Details
- Language :
- English
- ISSN :
- 11440546
- Volume :
- 41
- Issue :
- 5
- Database :
- Complementary Index
- Journal :
- New Journal of Chemistry
- Publication Type :
- Academic Journal
- Accession number :
- 121487931
- Full Text :
- https://doi.org/10.1039/c6nj03603a