High-brightness Eu3+-doped Ca3(PO4)2 red phosphor for NUV light-emitting diodes application

High-brightness red phosphor, Ca3(PO4)2:Eu3+ was prepared by the solid-state reaction. Its photo-luminescent property was investigated and the optimum concentration of Eu3+-doped in the Ca3(PO4)2 is 4 mol%. Its concentration quenching process is also studied. The single red light-emitting diode was obtained by combining InGaN chip with the red phosphor. The results show that this phosphor is a promising candidate as a red component for fabrication of NUV LEDs.

► High-brightness red phosphor Ca3(PO4)2:Eu3+ was prepared by the solid-state reaction.
► Ca3(PO4)2:Eu3+ exhibits strong and high color purity red emission under NUV excitation.
► The concentration quenching mechanism is found to be dipole–quadrupole (d–q) interaction.
► Bright red LED prototype based on Ca3(PO4)2:Eu3+ phosphor was fabricated.