Oxygen-vacancy rich in melilite to modulate the persistent luminescence for multi-functional applications

Abstract

Due to the simplicity of vacancy creation, Eu²⁺-doped melilite is an outstanding persistent luminescence (PersL) material with a continuing glow lifetime of more than several hours. In this paper, we propose a novel technique for activating a long-lasting phosphor (LLP) via oxygen-vacancy-rich Ca₂MgSi₂O₇:Eu²⁺ (V_O-CMSE), which shows that more V_O defects activate the persistent luminescence of Eu²⁺. V_O-CMSE has a long duration and high charge storage capacity, allowing it to perform efficiently in a variety of applications. Consequently, the intensity of V_O-CMSE is enhanced, which has been demonstrated to be useful in compensating for the flicker effect of AC-LEDs (alternating current light-emitting diodes). A new approach for generating white light emission during dimming time was presented, and an AC-LED lamp with a flicker percentage drop of 29.9% was manufactured. Dynamic anti-counterfeiting applications were also presented. These discoveries are likely to hasten the development of new LLP materials.