Journal
JOURNAL OF LUMINESCENCE
Volume 229, Issue -, Pages -Publisher
ELSEVIER
DOI: 10.1016/j.jlumin.2020.117685
Keywords
Photoluminescence; Green emitting phosphor; Energy transfer mechanism; White LEDs; CIE diagram
Categories
Funding
- National Natural Science Foundation of China [51502190]
- Young Sanjin Scholars Distinguished Professor Program of Shanxi Province
- Open Fund of the State Key Laboratory of Luminescent Materials and Devices (South China University of Technology) [2020-skllmd-01]
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Ce3+/Tb3+ co-doped Ba2Gd5B5O17 borate phosphors exhibit broad excitation bands, color-tunable emission outputs, and energy transfer mechanism between Ce3+ and Tb3+. The intensity ratio of emission spectra can be adjusted by doping concentration, and the phosphors show good thermal stability.
In this paper, Ce3+/Tb3+ co-doped blue-green emitting Ba2Gd5B5O17 borate phosphors were prepared for the first time. Phase purity, crystal structure, photoluminescence properties, energy transfer, and thermal stability of the as-synthesized samples were studied in detailed. The Ce3+ ions singly doped Ba2Gd5B5O17:Ce3+ phosphors had a broad excitation band in the 300-400 nm spectral range peaking at 345 nm, and when excited at 345 nm they exhibited a broad blue emission band in the 350-700 nm wavelength range with a maximum at 450 nm. Energy transfer process from Ce3+ to Tb3+ ions took place in the Ce3+/Tb3+ co-doped Ba2Gd5B5O17 phosphors, resulting in color-tunable emission outputs. It was found that under the excitation of 345 nm, the emission spectra of Ba2Gd5B5O17:Ce3+,Tb3+ phosphors displayed the broad blue emission band of Ce3+ ions and the characteristic sharp green emission lines of Tb3+ ions. Moreover, the intensity ratio of Ce3+ blue emission to Tb3+ green emission was adjusted by increasing the Tb3+ doping concentration, and the Ce3+-> Tb3+ energy transfer mechanism was studied. Furthermore, the thermal stability of Ba2Gd5B5O17:Ce3+,Tb3+ phosphors was estimated, and the activation energy of Ba2Gd5B5O17:0.008Ce(3+), 0.2 Tb3+ sample was calculated to be 0.205 eV. The ob-tained results revealed that blue-green emitting Ba2Gd5B5O17:Ce3+,Tb3+ borate phosphors have potential usage in the fabrication of near-UV based white LEDs.
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