A three-layered phosphor structure was designed and prepared by the spin coating of BaSi₂N₂O₂:Eu (cyan-emitting) and (Sr,Ca)AlSiN₃:Eu (red-emitting) phosphor films on the yellow-emitting Y₃Al₅O₁₂:Ce (YAG:Ce) phosphor ceramic synthesized by the solid-state reaction under vacuum sintering. In order to achieve high color rendering lighting, the influence of the composition and structure of the three-layered phosphors on the optical, thermal, and electrical properties of the chip-on-board (COB) packaged white-light-emitting diodes (WLEDs) was studied systematically. The WLED with the structure of “red+cyan+yellow” (R+C+Y) three-layered phosphor generated neutral white light and had a luminous efficacy of 75 lm/W, the fidelity index (R_f) of 93, the gamut index (R_g) of 97, and the correlated color temperature (CCT) of 3852 K. Under the excitation of laser diode (LD), the layer-structured phosphor yielded the white light with a luminous efficacy of 120 lm/W, color rendering index (CRI) of 90, and CCT of 5988 K. The result indicates that the three-layered phosphor structure is a promising candidate to achieve high color rendering and high luminous efficacy lighting.

通过旋涂BaSi ₂ N ₂ O ₂ :Eu（发青色）和（Sr,Ca）AlSiN ₃ :Eu（发红光）荧光粉膜，设计并制备了三层荧光粉结构。Y ₃ Al ₅ O ₁₂通过真空烧结固态反应合成的:Ce (YAG:Ce) 荧光粉陶瓷。为了实现高显色照明，三层荧光粉的组成和结构对板上芯片（COB）封装的白光发光二极管（WLED）的光学、热学和电学性能的影响) 进行了系统研究。“红+青+黄”（R+C+Y）三层荧光粉结构的WLED产生中性白光，光效为75 lm/W，保真指数（R _f）为93，色域指数 ( R _g) 97，相关色温 (CCT) 为 3852 K。 在激光二极管 (LD) 的激发下，层状结构荧光粉产生白光，发光效率为 120 lm/W，显色指数 (CRI) ) 90，CCT 5988 K。结果表明三层荧光粉结构是实现高显色性和高光效照明的有希望的候选者。