55.
A series of single-component blue, green and red phosphors have been fabricated based on the Ca
3Gd(GaO)
3(BO
3)
4 host through doping of the Ce
3+/Tb
3+/Eu
3+ ions, and their crystal structure and photoluminescence properties have been discussed in detail. A terbium bridge model via Ce
3+ → Tb
3+ → Eu
3+ 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 Ce
3+ → Tb
3+ → Eu
3+ energy transfer. The energy transfer mechanisms of Ce
3+ → Tb
3+ and Tb
3+ → Eu
3+ were found to be dipole-dipole interactions. Importantly, Ca
3Gd(GaO)
3(BO
3)
4:Ce
3+,Tb
3+,Eu
3+ phosphors had high internal quantum efficiency. Moreover, the study on the temperature-dependent emission spectra revealed that the Ca
3Gd(GaO)
3(BO
3)
4:Ce
3+,Tb
3+,Eu
3+ phosphors possessed good thermal stability. The above results indicate that the phosphors can be applied into white light-emitting diodes as single-component multi-colour phosphors.
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