Broadband emissions from Lu2Mg2Al2Si2O12:Ce3+ plate ceramic phosphors enable a high color-rendering index for laser-driven lighting

Abstract

By selecting phosphors that can be efficiently excited by blue light and have a broadband emission, Lu_2−xMg₂Al₂Si₂O₁₂:xCe³⁺ (LMAS:xCe³⁺) was fabricated as a plate ceramic phosphor (PCP) for the first time. The optimal LMAS:0.08Ce³⁺ PCP shows a broad yellow-orange emission peaking at 565 nm with a bandwidth of 130 nm. At 150 °C, the thermal stability of the LMAS:0.08Ce³⁺ PCP is improved by 8% compared with that of the phosphor type. Benefitting from the broadband emissive characteristic, the LMAS:0.08Ce³⁺ PCP provides a color-rendering index of 76–78 under 455 nm laser excitation. These values are the highest recorded in laser-driven lighting reported till now, and they are much better than that (55–65) of the YAG:Ce³⁺ PCP. These excellent color performances indicate that the titled PCP is promising for application in laser-driven lighting that has a high color quality. We believe that this work will open a new perspective to develop PCPs for next-generation laser-driven lighting.