Abstract
Charge compensated Sr3WO6:K+,Eu3+ was reported as an efficient red phosphor for white light emitting diodes (LEDs). It exhibited a strong red emission centered at 618nm. The main excitations are from f–f transitions of Eu3+ ions (360–550nm), which matched the near ultraviolet and blue LEDs. The effects of charge compensation (Li+,Na+, and K+) on the photoluminescence properties were investigated and K+ was the best one among Li+,Na+, and K+. The reason for the enhancement of the red emission was discussed in detail. K+ played a different role for different doping concentration. Comparing with Y2O2S:Eu3+ red phosphor, Sr3WO6:K+,Eu3+ is much more stable, efficient and suitable for phosphor conversion LEDs.
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