Al₂O₃–Y₃Al₅O₁₂:Ce (Al₂O₃-YAG:Ce) eutectic with weak attenuation at high temperature has a wide range of applications in high-power white light solid-state lighting. However, the general color rendering index (general CRI, R_a, the average value of R₁-R₈) of phosphor-converted white light-emitting diode (Pc-WLED) based on this material is usually no higher than 70 (CCT < 6500 K). We grew Al₂O₃-YAG eutectics doped with three ions of Ce³⁺, Pr³⁺, and Cr³⁺ by the micro pulling-down (μ-PD) method to improve the R_a through the co-luminescence and energy-transfer. The co-luminescence and energy-transfer were analyzed by the excitation-emission spectrum and the spectral power distribution. Results show that the energy-transfer between Ce³⁺ and Pr³⁺ ions in Al₂O₃-YAG:Ce, Pr occurs with each other, visibly enhancing the emission at around 610 nm and 694 nm, increases the R_a by 8.4 compared to Al₂O₃-YAG:Ce. Moreover, the R_a of the Al₂O₃-YAG:Ce and Al₂O₃-YAG:Cr stacked Pc-WLED increases by 20.4 compared to Al₂O₃-YAG:Ce, reaching 78.7. In addition, (R₉, the special CRI for strong red, is 59.). In addition, the annealed (H₂) single-doped eutectics have little change compared to unannealed ones in luminescence, but the co-doped ones with multiple ions have a significant change. Significantly, the luminous efficiency of Al₂O₃-YAG:Ce after annealing is only increased by 4%, while that of Al₂O₃-YAG:Ce, Pr is increased by 13%. These studies show that the CRI of Pc-WLED base on Al₂O₃-YAG:Ce eutectic can be improved by ion co-doping in eutectic or superposition of Al₂O₃-YAG eutectic doped with other ions.

Al ₂ O ₃ –Y ₃ Al ₅ O ₁₂ :Ce（Al ₂ O ₃ -YAG:Ce）共晶在高温下衰减较弱，在大功率白光固态照明中有着广泛的应用。然而，基于这种材料的荧光转换白光发光二极管（Pc-WLED）的一般显色指数（一般CRI，R _a，R ₁ -R ₈的平均值）通常不高于70（CCT < 6500 K)。我们生长了掺杂有 Ce ³⁺、Pr ³⁺和 Cr ³⁺三种离子的Al ₂ O ₃ -YAG 共晶物通过微下拉（μ-PD）方法通过共发光和能量转移来提高R _a。通过激发发射光谱和光谱功率分布分析了共发光和能量转移。结果表明，铈之间的能量传递³⁺和Pr ³⁺离子的Al ₂ ö ₃ -YAG：CE，镨彼此发生时，在在610nm附近和694纳米明显增强的排放，增加将R_一个8.4与Al ₂ O ₃ -YAG:Ce 相比。此外，Al ₂ O ₃ -YAG:Ce 和 Al ₂ O ₃的 R _a-YAG:Cr 堆叠 Pc-WLED 与 Al ₂ O ₃ -YAG:Ce相比增加了 20.4 ，达到 78.7。此外，（R ₉，强红色的特殊显色指数为59。）。此外，退火（H ₂）单掺杂共晶与未退火共晶的发光变化不大，但多离子共掺杂的共掺杂有显着变化。值得注意的是，Al ₂ O ₃ -YAG:Ce退火后的发光效率仅提高了4%，而Al ₂ O ₃ -YAG:Ce, Pr的发光效率提高了13%。这些研究表明，Pc-WLED 的 CRI 基于 Al ₂ O ₃-YAG:Ce 共晶可以通过共晶中的离子共掺杂或掺杂其他离子的Al ₂ O ₃ -YAG 共晶的叠加来改善。