Title
Tunable visible emission and persistent luminescence of BaGa2O4:Cu2+
Author
Wang, Lei (Hefei University of Technology)
Zhao, Ning (Hefei University of Technology)
Zhu, Changrui (Hefei University of Technology)
Chen, Lei (Hefei University of Technology)
Jiang, Yang (Hefei University of Technology)
Zhou, Rulong (Hefei University of Technology)
Liu, Yanfang (Hefei University of Technology)
Qu, Bingyan (Hefei University of Technology)
Hintzen, H.T.J.M. (TU Delft RST/Luminescence Materials)
Date
2024
Abstract
In the field of solid-state luminescence, Cu2+ has long been widely acknowledged for its capacity to emit infrared light. However, the occurrence of visible emission from Cu2+ ions had been infrequently observed and reported. In this study, we made an intriguing discovery by examining the behavior of Cu2+ within an irregular coordination environment of Ba in BaGa2O4. When excited by UV light, Cu2+ unexpectedly gave a vibrant yellow–red emission, covering a wavelength range spanning from 500 to 750 nm. More noteworthy, by simply manipulating the excitation wavelength or adjusting the temperature, the peak wavelength of the emission could be effectively tuned from approximately 600 to 660 nm, which could be attributed to the luminescence nature of the charge transfer (CT) between O2− and Cu2+. Moreover, the phosphor material displayed a remarkable persistent luminescence (PerL) lasting up to 12 h after UV light excitation. Through thermoluminescence (TL) measurements and first-principle calculations, we found that the intrinsic defects, such as vacancies of oxygen and gallium (VO and VGa″), played important roles for the PerL phenomena. These findings highlighted the exceptional tunability and PerL properties of BaGa2O4:Cu2+. Our study provided a new potential guideline for the design of Cu2+-activated phosphors in visible region, and opened up new avenues for the research in related functional luminescence materials.
Subject
Cu luminescence
Mechanism
Persistent luminescence
Phosphors
Tunable emission
To reference this document use:
http://resolver.tudelft.nl/uuid:1748f6c4-08e2-4124-aee3-68398205bfaf
DOI
https://doi.org/10.1016/j.cej.2024.149361
Embargo date
2024-09-01
ISSN
1385-8947
Source
Chemical Engineering Journal, 483
Bibliographical note
Green Open Access added to TU Delft Institutional Repository ‘You share, we take care!’ – Taverne project https://www.openaccess.nl/en/you-share-we-take-care Otherwise as indicated in the copyright section: the publisher is the copyright holder of this work and the author uses the Dutch legislation to make this work public.
Part of collection
Institutional Repository
Document type
journal article
Rights
© 2024 Lei Wang, Ning Zhao, Changrui Zhu, Lei Chen, Yang Jiang, Rulong Zhou, Yanfang Liu, Bingyan Qu, H.T.J.M. Hintzen