Issue 8, 2024

Competition mechanism of self-trapped excitons and Te4+ ions emission in the Te4+ doped vacancy-ordered double perovskite Rb2HfCl6 and its excellent properties

Abstract

Vacancy-ordered double perovskites (VODPs) have attracted much attention because of their excellent photoelectric properties. However, the competition mechanism of self-trapped exciton emission and Te4+ ion emission in Te4+-doped VODPs is still unclear. Herein, we synthesized Rb2HfCl6 microparticles with a blue self-trapped excitons (STEs) emission, which have a near-unity photoluminescence quantum yield (PLQY), the highest reported value (98.56%) for a VODP matrix. In addition, it has a new broadband yellow emission peak at 560 nm with a PLQY of 76.72% via the equivalent doping of Te4+ ions. The combination of the blue luminescence of pristine Rb2HfCl6 with the yellow luminescence from the Te4+ ion emission could be used in fluorescence anti-counterfeiting. We also prepared a white light-emitting diode (WLED) with the Commission Internationale de l'Eclairage (CIE) coordinates at (0.3502, 0.3527), a correlated color temperature (CCT) of 4814 K and a color-rendering index (CRI) of 75.3. Moreover, optimized Rb2HfCl6:Te4+ exhibited excellent air and thermal stability. The luminescence dynamics and theoretical calculations jointly reveal that this efficient emission originates from the electron transitions in the different paths. This work provides a new perspective and new theoretical support for the future research on ion-doped luminescent systems.

Graphical abstract: Competition mechanism of self-trapped excitons and Te4+ ions emission in the Te4+ doped vacancy-ordered double perovskite Rb2HfCl6 and its excellent properties

Supplementary files

Article information

Article type
Research Article
Submitted
16 jan 2024
Accepted
13 mar 2024
First published
25 mar 2024

Inorg. Chem. Front., 2024,11, 2457-2470

Competition mechanism of self-trapped excitons and Te4+ ions emission in the Te4+ doped vacancy-ordered double perovskite Rb2HfCl6 and its excellent properties

R. Liu, K. Zou, G. Zhang, M. Feng, M. Li and J. Liu, Inorg. Chem. Front., 2024, 11, 2457 DOI: 10.1039/D4QI00109E

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