Enhanced luminescence in Eu3+-doped glass-ceramic derived from black talc: A novel approach for advanced W-LED lighting applications

Abstract

In the realm of advanced luminescent materials, glass-ceramic (GC) incorporated into rare earth (RE) represents a promising candidate. However, their practical application has been constrained by limitations in luminescence efficiency and thermal stability. This study overcomes these challenges by introducing a novel Eu³⁺-doped black talc GC with enhanced optical characteristics. Our method involved fabricating a new glass matrix and incorporating heavy concentrations of Eu³⁺ ions. Following a precise nucleation-crystallization process, CaMgSi₂O₆ nanoscale crystals were uniformly dispersed within the GCs matrix, markedly enhancing its luminescent properties. When excited by 394 nm light, this GC achieved a notable internal quantum efficiency (IQE) of 88.97 %, surpassing many traditional Eu³⁺-doped glasses and GCs. Furthermore, it retained 89.6 % of its luminescence intensity even at 100 °C, indicating remarkable thermostability. To validate the GC's practical utility, we integrated this material into a white light-emitting diode (W-LED) component, incorporating a LED chip, CaMgSi₂O₆: Eu³⁺ GC, BaMgAl₁₀O₁₇: Eu²⁺, and Ba₂SiO₄: Eu²⁺ phosphor. The fabricated device demonstrated excellent chromaticity coordinates of (0.3493, 0.3935), a correlated color temperature (CCT) of 4976K, and a prominent color rendering index (CRI) of 90.3. This research not only expands the potential applications of black talc, but the prepared GCs also exhibit excellent performance in luminescence properties, highlighting the broad application of this Eu³⁺-doped GCs in W-LED lighting technology.