Abstract
Herein, using K2Ba7Si16O40 as a host, we achieved strong cyan persistent luminescence (PersL) through codoping Eu2+ and Nd3+ ions. In comparison with Eu2+ ions single doped sample, the initial PersL intensity and duration of Nd3+ ions co-doped sample (in which Eu2+ and Nd3+ concentration was optimized to be 0.015 mol) were discovered to be 4.8 times stronger and 6.5 times longer, respectively. The PersL duration of which above 0.32 mcd m-2 sustained more than 10 h. Moreover, Nd3+ ions co-doping not only substantially enhances photoluminescence (PL) emission of Eu2+ ions but also the thermal stability, attributed to the energy transfer from the newly acquired traps to the 5d energy levels of Eu2+ ions, leading to the radiative recombination. This significant discovery greatly expands the filed of PersL phosphors and provides a theoretical basis and a new approach by introducing appropriate traps to minimize the thermal quenching and improve the efficient of luminescent materials.
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