Luminescent properties of blue emitting phosphor SrZn_2(PO_4)_2:Eu^(2+) for white LEDs

Blue emitting phosphor SrZn_2(PO_4)_2:Eu^(2+) is synthesized by a high temperature solid state method,and the luminescent properties are investigated.At the 330 nm radiation excitation,SrZn_2(PO_4)_2:Eu^(2+) presents an emission band at 416 nm,which is assigned to the 4f^65d^1→4f^7 transition of Eu^(2+) ion.The concentration quenching effect of Eu^(2+) in SrZn_2(PO_4)_2has been validated and proved to be a resonant type via a dipole-dipole interaction.The critical distance(R_c) of Eu^(2+) in SrZn_2(PO_4)_2 is calculated to be 3.244 nm.The Commission International de I'Eclairage(CIE) chromaticity coordinates of SrZn_2(PO_4)_2:Eu^(2+) locate at the blue region,such as(0.150,0.072).The results indicate that the SrZn_2(PO_4)_2:Eu^(2+)phosphor may have potential applications in white light emitting diodes(LEDs).

Blue emitting phosphor SrZn2（PO4）2：Eu2＋ is synthesized by a high temperature solid state method, and the luminescent properties are investigated. At the 330 nm radiation excitation, SrZn2（PO4）E：EU2＋ presents an emission band at 416 nm, which is assigned to the 4f65d1→4f7 transition of Eu2＋ ion. The concentration quenching effect of Eu2＋ in SrZnE（PO4）2 has been validated and proved to be a resonant type via a dipole-dipole interaction. The critical distance （Re） of Eu2＋ in SrZnE（PO4）2 is calculated to be 3.244 nm. The Commission International de I＇Eclairage （CIE） chromaticity coordinates of SrZn2（PO4）E：EU2＋ locate at the blue region, such as （0.150, 0.072）： The results indicate that the SrZn2（PO4）2：Eu2＋ phosphor may have potential applications in white light emitting diodes （LEDs）.