Solar-like White Light from Sb 3+ /Tb 3+ /Mn 2+ Co-doped Cs 2 NaLuCl 6 via Multi-Center Energy Transfer

Abstract

Single-phosphor white-light-emitting materials have attracted considerable attention due to their structural simplicity and spectral stability. Here, Sb 3+ /Tb 3+ /Mn 2+ co-doped Cs2NaLuCl6 lead-free double perovskite phosphors were synthesized via a solvothermal method. Taking advantage of Sb 3+ -sensitized self-trapped exciton (STE) emission, a multicenter synergistic energy-transfer pathway from the STE state to Tb 3+ and Mn 2+ ions was constructed, yielding blue, green, and red emissions that collectively cover the visible spectrum. Through optimizing the Tb 3+ and Mn 2+ concentrations, the resulting Cs2NaLu0.65Cl6: 0.01Sb 3+ , 0.14Tb 3+ , 0.20Mn 2+ phosphor exhibits efficient solar-like white-light under 365 nm excitation, with a high photoluminescence quantum yield (PLQY) of 83%. A white-light-emitting diode (WLED) fabricated with this phosphor delivers stable white-light output, showing a correlated color temperature (CCT) of 4186 K and a color rendering index (CRI) of 92. This work provides a new design strategy for lead-free perovskite-based single-phosphor whitelight-emitting materials for potential applications in solid-state lighting and displays.