Journal
CERAMICS INTERNATIONAL
Volume 44, Issue 5, Pages 4915-4923Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.ceramint.2017.12.082
Keywords
Phosphors; Rare-earth; White LEDs; Photoluminescence; Energy transfer; Emission tuning
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Funding
- National Natural Science Foundation of China [51502190]
- Program for the Outstanding Innovative Teams of Higher Learning Institutions of Shanxi
- Startup Research Grant of Taiyuan University of Technology [Tyutrc201489a]
- Excellent Young Scholars Research Grant of Taiyuan University of Technology [2014YQ009, 2015YQ006, 2016YQ03]
- Open Fund of the State Key Laboratory of Luminescent Materials and Devices (South China University of Technology) [2017-skllmd-01]
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A series of single-component blue, green and red phosphors have been fabricated based on the Ca3Gd (GaO)(3)(BO3)(4) host through doping of the Ce3+ /Tb3+ /Eu3+ ions, and their crystal structure and photoluminescence properties have been discussed in detail. A terbium bridge model via Ce3+ -> Tb3+ -> Eu3+ energy transfer has been studied. The emission colours of the phosphors can be tuned from blue (0.1661, 0.0686) to green (0.3263, 0.4791) and eventually to red (0.5284, 0.4040) under a single 344 nm UV excitation as the result of the Ce3+ -> Tb3+ -> Eu3+ energy transfer. The energy transfer mechanisms of Ce3+ -> Tb3+ and Tb3+ -> Eu3+ were found to be dipole-dipole interactions. Importantly, Ca3Gd(GaO)(3)(BO3)(4:)Ce3+,Tb3+,Eu3+ phosphors had high internal quantum efficiency. Moreover, the study on the temperature-dependent emission spectra revealed that the Ca3Gd(GaO)(3)(BO3)(4);Ce3+,TB3+,Eu3+ phosphors possessed good thermal stability. The above results indicate that the phosphors can be applied into white light-emitting diodes as single-component multicolour phosphors.
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