科研之友
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摘要
Green color-emitting novel CaGd2ZnO5:Tb3+ (CGZO:Tb3+) nanophosphors were synthesized by a citrate sol-gel method. The structural and morphological properties were elucidated by X-ray diffraction and transmission electron microscope measurements. The photoluminescence properties of orthorhombicphased CGZO: Tb3+ nanophosphors were studied as a function of Tb3+ ion concentration. The CGZO: Tb3+ nanophosphors revealed the enhanced broadband excitation between ultraviolet (UV)-B and UV-A regions. Under 317 nm excitation, even at dilute Tb3+ ion concentrations, only the emission transitions from 5D4 energy level were exhibited. This unusual behavior is due to the occurrence of nonradiative energy transfer via f-d transition rather than cross-relaxation process. The cathodoluminescence also showed similar behavior at low accelerating voltages. These luminescent powders are expected to find potential applications such as white light-emitting diodes and optical display systems.
- 出版日期2015
