Yellow-emitting (Ca2Lu1−xCex)(ScMg)Si3O12 phosphor and its application for white LEDs

Luminescence properties of the yellow-emitting (Ca2Lu1−xCex)(ScMg)Si3O12 (CLSM:xCe3+x = 0.01–0.15) phosphor are investigated for various Ce3+ concentrations. Different Ce3+ emission sites and energy transfers between them are observed, resulting in a red shift of the emission spectra from 530 to 575 nm with increasing x from 0.01 to 0.15. Combining with blue (460 nm) InGaN LEDs, CLSM:Ce3+ shows excellent performances for phosphor-converted white LEDs with higher color rendering index Ra of 87.4–87.9 and lower color temperature TC of 5034–5814 K, especially for warm pcWLEDs with a high color rendering (Ra > 80) and a low color temperature (TC < 4000 K). Thermal quenching behaviors depending on Ce3+ concentrations and temperatures are discussed.

In this research, we provide a novel yellow phosphor by solid-state reactions. By using this single yellow phosphor, white LEDs with an excellent Ra of 88 and a low TC of 5800 K are obtained. Furthermore, this yellow phosphor also shows excellent performance in warm white LEDs with Ra > 80 and TC < 4000 K. Crystal structure and luminescence properties were investigated.Figure optionsDownload as PowerPoint slideHighlights
► Different Ce3+ emission sites and energy transfer between them are observed in (Ca2Lu1−xCex)(ScMg)Si3O12 (CLSM:Ce3+).
► CLSM:Ce3+ shows excellent performances for white LEDs with a high color rendering index (Ra) of 87.9.
► Especially for warm white LEDs with a high Ra (>80) and a low color temperature (<4000 K).