Full-spectrum solid-state lighting with temperature self-monitoring using Ag clusters and Eu³⁺ co-doped borate glass

Abstract

Ag clusters and Eu³⁺ co-doped borate glasses were synthesized via high-temperature melting and quenching. Fluorescence spectroscopy and fluorescence decay curves indicated energy transfer from Ag clusters to Eu³⁺, and the Dexter model confirmed that the energy transfer mechanism is dominated by dipole-dipole (D-D) interactions. By adjusting Eu³⁺ concentration, warm white light emission was achieved in the Ag cluster/Eu³⁺ co-doped borate glasses. The emission spectra of W-LED devices, composed of Ag cluster/Eu³⁺ co-doped borate glasses and a 310 nm LED chip, were tested, with color coordinates, color temperature, and color rendering index (CRI) of (0.38, 0.37), 3808 K, and 90.4, respectively. Further spectral tests under varying driving currents and temperatures demonstrated that the Ag cluster/Eu³⁺ co-doped borate glasses are stable candidates for W-LED materials. Additionally, the optical temperature sensing properties of the Ag cluster/Eu³⁺ co-doped borate glasses enabled the W-LED device to achieve self-temperature monitoring.