An efficient charge compensated red phosphor Sr3WO6: K+, Eu3+ – For white LEDs

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 618 nm. The main excitations are from f–f transitions of Eu3+ ions (360–550 nm), 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.

► Eu3+ activated Sr3WO6 is lack of inversion centrosymmetry site. ► Strong excitation peaks of Sr3WO6: K+,Eu3+ matched the NUV and blue LEDs. ► K+ played a different role at different content for the emission enhancement.