Red-Emitting SrGa₂O₄:Cu²⁺Phosphor with Super-Long Persistent Luminescence

Red-Emitting SrGa₂O₄:Cu²⁺Phosphor with Super-Long Persistent Luminescence

Wang, Lei (Hefei University of Technology)
Wang, Cailu (Hefei University of Technology)
Chen, Y. (Hefei University of Technology)
Jiang, Yang (Hefei University of Technology)
Chen, Lei (Hefei University of Technology)
Xu, Jinzhang (Hefei University of Technology)
Qu, Bingyan (Hefei University of Technology)
Hintzen, H.T.J.M. (TU Delft RST/Luminescence Materials)

2022

The red afterglow of current rare-earth-activated long persistent luminescence (LPL) phosphors is largely still less than 6 h, in contrast to the 20 or 30 h long blue- or green-emitting ones, becoming the main obstacle to realize their multiscenario applications in practice. Herein, we report a rare-earth-free red-emitting LPL phosphor SrGa₂O₄:Cu²⁺that can exhibit an afterglow at about 622 nm lasting over 30 h, which can largely match with the luminance of current blue- or green-emitting LPL phosphors. We find that the Cu²⁺ion could be charged by ultraviolet light from 280 to 420 nm, and the emission has a very broad band with a full width at half-maximum of about 150 nm. Combining the thermoluminescence measurement and the first-principles calculation, we find that the O vacancies and the -1 charged Ga vacancies could store the holes and contribute to the LPL of SrGa₂O₄:Cu²⁺. Our results may dramatically promote and expand its potential applications and stimulate the research of the multicolor LPL phosphors in future.

http://resolver.tudelft.nl/uuid:a64bd1c0-74d3-4c4e-b0eb-1aa43b626e85

https://doi.org/10.1021/acs.chemmater.2c02748

2023-07-01

0897-4756

Chemistry of Materials, 34 (22), 10068-10076

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.

Institutional Repository

journal article

© 2022 Lei Wang, Cailu Wang, Y. Chen, Yang Jiang, Lei Chen, Jinzhang Xu, Bingyan Qu, H.T.J.M. Hintzen