Ce 3+ -Eu 2+ Co-doped BaCa 13 Mg 2 (SiO 4 ) 8 cyan phosphor-ultra-high energy transfer efficiency for white light emitting diodes.

The energy transfer of Ce 3+ -Eu 2+ can often greatly increase the luminescence efficiency and expand the scope of application. In this study, blue to cyan color-tunable phosphors BaCa 13 Mg 2 (SiO 4 ) 8 :Ce 3+ ,Eu 2+ were prepared. BaCa 13 Mg 2 (SiO 4 ) 8 :Eu 2+ cyan phosphors have limited applications in WLEDs because of their disadvantages, including the inadequate luminescence performance and imperfect matching of UV chips. Therefore, Ce 3+ ions were used as sensitizers to enhance the optical performance of Eu 2+ ions. The energy transfer efficiency between Ce 3+ and Eu 2+ in the BaCa 13 Mg 2 (SiO 4 ) 8 host was calculated to be 96.7%, and the incorporation of Ce 3+ ions boosted the integrated intensity and quantum efficiency of the emission spectrum by approximately 80% and 20%, respectively. At 140 °C, the integral emission intensities could still keep at 81.5% of the initial integral intensities at 25 °C. The Ce 3+ , Eu 2+ co-doped cyan phosphor-based WLED lamp could produce outstanding warm white light with CIE coordinates of (0.3722, 0.3222), demonstrating the enormous potential for WLED applications.