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

The luminescence mechanism of Te 4+ -doped VODPs is reported. Te 4+ -doped Hf-based VODPs exhibit luminescence characteristics that are more in line with those of Te 4+ ions, while Te 4+ -doped Sn- and Zr-based VODPs have STEs emission characteristics.