Evaluating the use of blue phosphors in white LEDs: the case of Sr0.25Ba0.75Si2O2N2:Eu2+

The luminescence properties of the blue emitting phosphor Sr 0.25 Ba 0.75 Si 2 O 2 N 2 :Eu 2+ are extensively investigated. This oxonitridosilicate phosphor features strong 4f 6 5d 1 - 4f 7 luminescence originating from the Eu 2+ ion, with a narrow emission band peaking at 467 nm and a full width at half maximum of only 41 nm. Thermal quenching of the blue luminescence only sets in above 450 K, making this material an interesting candidate as...