Abstract
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 575nm with increasing x from 0.01 to 0.15. Combining with blue (460nm) 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 5034–5814K, especially for warm pcWLEDs with a high color rendering (Ra>80) and a low color temperature (TC<4000K). Thermal quenching behaviors depending on Ce3+ concentrations and temperatures are discussed.
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