Simple synthetic route to Ca18.75Li10.5[Al39N55]:Ce3+ yellow-green phosphors for white LEDs

Nitride phosphors usually have great influence on the performance of white LEDs. However, most nitrides require synthesis under high temperature and high pressure, especially Ca18.75Li10.5[Al39N55] (CLAN), which demands preparation even under a pressure of 51.7 MPa. Herein, we applied a simple synthetic route to obtain CLAN at a low pressure of 0.85 MPa and temperature of 1250 degrees C. In addition, the luminescence properties of Ce3+ doped CLAN were studied and the CLAN:Ce3+ shows three excitation bands peaked at 267, 387, and 478 nm. Two emission peaks are located at 513 nm and 567 nm, corresponding to the d-f electronic transition of Ce3+, respectively. The emission intensity at 150 degrees C retains about 83.3% of the initial value at room temperature, indicating a good thermal stability. A prototype white LED encapsulated with a 450 nm chip and the CLAN:Ce3+ phosphor exhibits bright white emission, indicating potential applications. (C) 2022 Optica Publishing Group under the terms of the Optica Open Access Publishing Agreement