UV-A and UV-B excitation region broadened novel green color-emitting CaGd 2 ZnO 5 :Tb 3+ nanophosphors

Green color-emitting novel CaGd 2 ZnO 5 :Tb 3+ (CGZO:Tb 3+ ) 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 orthorhombi...

Full description

Saved in:
Bibliographic Details
Published in:RSC advances 2015, Vol.5 (28), p.22217-22223
Main Authors: Rama Raju, G. Seeta, Pavitra, E., Nagaraju, Goli, Guan, Xiang-Yu, Yu, Jae Su
Format: Article
Language:English
Citations: Items that this one cites
Items that cite this one
Online Access:Get full text
Tags: Add Tag
No Tags, Be the first to tag this record!
Description
Summary:Green color-emitting novel CaGd 2 ZnO 5 :Tb 3+ (CGZO:Tb 3+ ) 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 orthorhombic-phased CGZO:Tb 3+ nanophosphors were studied as a function of Tb 3+ ion concentration. The CGZO:Tb 3+ nanophosphors revealed the enhanced broadband excitation between ultraviolet (UV)-B and UV-A regions. Under 317 nm excitation, even at dilute Tb 3+ ion concentrations, only the emission transitions from 5 D 4 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.
ISSN:2046-2069
2046-2069
DOI:10.1039/C4RA15376F