Journal
DYES AND PIGMENTS
Volume 160, Issue -, Pages 675-682Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.dyepig.2018.08.064
Keywords
Silicon oxynitride; Energy conversion; Energy transfer; Phosphors
Funding
- National Science Foundation of China [51372238, U1732115, 11435012]
- CNPC-CAS [2015A-4812]
- SZ government fund in 2019
- Shenzhen University [85303-00000207]
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A series of Y5Si3O12N:Ce3+ single-doped and Ce3+/Tb3+ co-doped phosphors, as potential candidates for application in tri-chromatic white LEDs, were successfully synthesized by a high temperature solid state reaction method. The addition of Li2CO3 flux (5 wt%) improved the purity of the resultant phosphors and increased their emission intensity. An intense, broad excitation band in the range of 200-400 rim with a peak at 358 rim was recorded, which suits the needs of UV LED chips. Under this excitation wavelength, intense blue emission, which peaked at 439 nm, was recorded in the Ce3+ single-doped phosphors, while two distinct luminescence bands were observed in the Ce3+/Tb3+ co doped Y3Si3O12N phosphors: a blue one, which peaked at 439 nm and is ascribed to Ce3+ ions, and an efficient green one, which peaked at 549 nm and is assigned to D-5(4) -> F-7(3) transitions in Tb3+ ions. A high luminescence quantum yield, of 85%, was achieved. The experimental results illustrate that efficient energy transfer can take place from the sensitizer Ce3+ ions to the activator Tb3+ ions in the Ce3+/Tb3+ co doped Y5Si3O12N phosphors, through predominantly dipole dipole interactions.
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