Abstract
Thermal quenching (TQ) seriously restricts the practical applications of phosphor-converted white-lighting-emitting diodes (pc-WLEDs), especially for high-power operations. Here, a novel red-emitting phosphor LaOBr: Eu3+ with layered tetragonal structure was successfully synthesized by a solid-state reaction approach. Due to additional Li+ ion doping into LaOBr: Eu3+, the as-obtained phosphors manifest excellent performance with high internal quenching efficiency (IQE) (58.6%) and anti-thermal quenching performance. It is demonstrated that the structural rigidity of the lattice matrix could be enhanced with the introduction of Li+ ions and, then, it contributes to the suppression of TQ and the improvement of the luminescence efficiency. Furthermore, a fabricated WLED based on the LaOBr: Eu3+, Li+ sample displays an appropriate color rendering index (CRI = 83.1) and correlated color temperature (CCT = 4719 K), revealing the great potential of the as-obtained red phosphor for pc-WLEDs.
Funder
the Research Start-up Fund of Chengdu University of Technology
Project of Yunnan Provincial Natural Science Foundation
National Natural Science Foundation of China
Natural Science Foundation of Sichuan Province
Publisher
The Electrochemical Society
Subject
Electronic, Optical and Magnetic Materials