Microwave-assisted sintering synthesis of greenish-yellow emitting Sr2 SiO4 :Eu2+ phosphors
Woo Cheol Lee1, Jin Young Park1, Hyun Kyoung Yang1
1Department of LED Convergence Engineering, Pukyong National University, Busan, Republic of Korea.
Abstract:
Europium ion (Eu2+ ) doped Sr2 SiO4 phosphors with greenish-yellow emission were synthesized using microwave-assisted sintering. The phase structure and photoluminescence (PL) properties of the obtained phosphor samples were investigated. The PL excitation spectra of the Sr2 SiO4 :Eu2+ phosphors exhibited a broad band in the range of 260 nm to 485 nm with a maximum at 361 nm attributed to the 5f-4d allowed transition of the Eu2+ ions. Under an excitation at 361 nm, the Sr2 SiO4 :Eu2+ phosphor exhibited a greenish-yellow emission peak at 541 nm with an International-Commission-on-Illumination (CIE) chromaticity of (0.3064, 0.4772). The results suggest that the microwave-assisted sintering method is promising for the synthesis of phosphors owing to the decreased sintering time without the use of additional reductive agents.
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