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Warm white light-emitting diodes (WLEDs) with low correlated color temperature (CCT < 5000 K) have a wide range of applications in solid-state lighting. This work reports Y2Mg2Al2Si2O12 (YMAS):Ce3+,Mn2+ phosphors for warm WLEDs, which are suitable for current mainstream blue LED chips (λ = 460 nm). The crystal structure and site occupation of the synthetic materials conforms to the design, and they are studied experimentally and computationally. The spectral red shift of YMAS:Ce3+,Mn2+ phosphors can reach up to 77 nm compared with the commercial YAG:Ce phosphor. Their comparatively excellent thermal stability and good chromaticity stability are proved. Theoretically, this series of phosphors, combined with blue chips, can achieve almost the whole area of warm white light emission. Their practical application performance in LEDs is demonstrated, and the CCT of the LEDs achieves an effective optimization (∼4000 K). The simple synthetic method, effective color point tuning and good stability make YMAS:Ce3+,Mn2+ an attractive candidate phosphor for warm white LED lighting.

materials advances

Crystal structure, luminescence properties and application performance of color tuning Y2Mg2Al2Si2O12:Ce3+,Mn2+ phosphors for warm white light-emitting diodes