Synthesis and photoluminescent properties of Sr(1−x)Si2O2N2: xEu2+ phosphor prepared by polymer metal complex method for WLEDs applications

• SrSi2O2N2: Eu2+ phosphor was prepared by polymer metal complex (pechini method).
• The annealing time was decreased from 6 h in solid state method to 3 h.
• The particles are crystalline and dispersed well with average size 6.5 μm.

Green emitting Sr(1−x)Si2O2N2: xEu2+ (x = 0, 0.02, 0.04, 0.06, 0.08 and 0.1) phosphors were synthesized by polymer metal complex or pechini method. The XRD results confirm the formation of a pure phase at 1400 °C for 3 h. The SEM and particles size results indicate that the prepared phosphor consists of a polyhedral crystalline shape with well dispersed and the average particle size around 6.5 μm. The maximum PL intensity was found at 0.04% Eu2+ with a wide emission band between 460 and 640 nm and a green emission peak at 531.4 nm. The external quantum efficiency of 0.04% Eu2+ sample was 43.13%. The results indicate that pechini method is an alternative way and close in efficiency to the solid state method to prepare SrSi2O2N2 phosphor with higher homogeneity and more uniform size distribution for near UV and blue region applications for white light emitting diodes WLEDs.

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