Role of synthesis method and α, β-Sr(2-x)SiO4: xEu2+ phases on the photoluminescent properties of Sr(1-x)Si2O2N2: xEu2+ phosphors

• Synthesis of SrSi2O2N2: Eu2+ using 2-steps with four different preparation methods.
• β-Sr2SiO4 phase has a significant effect on the crystallite size.
• Luminescence of SrSi2O2N2: Eu2+ is affect by the proportion of β-Sr2SiO4 phase.
• Synthesis method plays a big role to obtain high-efficiency SrSi2O2N2: Eu2+ phosphors.

SrSi2O2N2: Eu2+ (SSON) phosphors were prepared using two-steps synthesis method with Sr2SiO4: Eu2+ (SSO) as a precursor. In the first step, coprecipitation (CO), Pechini sol-gel (PSG), sol-gel (SG), and solid-state reaction (SS) methods were performed, whereas the second step was used SS method. The effects of the α- and β-SSO phases in the first step on the luminescence intensity, crystallite size, and quantum efficiency of SSON in the second step are investigated. The photoluminescence results of SSON show an emission spectrum band between 460 and 640 nm with green emission peaks at 530 nm. The luminescence emission intensity of SSON phosphor was increased in the order of CO, PSG, SG, and SS methods. The results indicate that increasing of β-SSO phase in the first step using a specific preparation method is an important key to obtain high-efficiency SSON phosphors for their promising application in WLEDs.

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