Issue 28, 2015
From the journal:

RSC Advances

UV-A and UV-B excitation region broadened novel green color-emitting CaGd2ZnO5:Tb3+ nanophosphors†

G. Seeta Rama Raju,a   E. Pavitra,a   Goli Nagaraju,a   Xiang-Yu Guana  and  Jae Su Yu*a  

* Corresponding authors

a Department of Electronics and Radio Engineering, Institute for Laser Engineering, Kyung Hee University, 1 Seocheon-dong, Giheung-gu, Yongin-si, Gyeonggi-do 446-701, Republic of Korea
E-mail: jsyu@khu.ac.kr
Fax: +82-31-206-2820
Tel: +82-31-201-3820

Abstract

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 orthorhombic-phased 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.

Graphical abstract: UV-A and UV-B excitation region broadened novel green color-emitting CaGd2ZnO5:Tb3+ nanophosphors

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Article information

DOI
https://doi.org/10.1039/C4RA15376F
Article type
Paper
Submitted
27 Nov 2014
Accepted
18 Feb 2015
First published
19 Feb 2015
This article is Open Access
Creative Commons BY license

RSC Adv., 2015,5, 22217-22223

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UV-A and UV-B excitation region broadened novel green color-emitting CaGd2ZnO5:Tb3+ nanophosphors

G. S. Rama Raju, E. Pavitra, G. Nagaraju, X. Guan and J. S. Yu, RSC Adv., 2015, 5, 22217 DOI: 10.1039/C4RA15376F

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