Abstract
An efficient blue–green emitting phosphor, Sr4Al14O25:Eu2+, was prepared by solid-state reaction. X-ray powder diffraction (XRD) analysis confirmed the formation of Sr4Al14O25:Eu2+. Field-emission scanning electron-microscopy (FE-SEM) observation indicated that the microstructure of the phosphor consisted of irregular fine grains with an average size of about 8–10 μm. Photoluminescence measurements showed a broad absorption band between 300 and 450 nm which was efficiently excited by near-ultraviolet (NUV) LEDs (350–410 nm) and a strong emission band peaking at 491 nm. A bright blue–green LED with chromatic coordination (0.176, 0.412) was fabricated by incorporating the phosphor with an InGaN-based NUV chip, which indicates that Sr4Al14O25:Eu2+ is a good candidate phosphor for application in white LEDs.
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