Luminescence properties of Ca5(PO4)2SiO4:Eu2+ green phosphor for near UV-based white LED

• Published in: Materials letters Vol. 70; pp. 37 - 39
• Main Authors: Roh, Hee-Suk, Hur, Seyoon, Song, Hee Jo, Park, Ik Jae, Yim, Dong Kyun, Kim, Dong-Wan, Hong, Kug Sun
• Format: Journal Article
• Language: English
• Published: Elsevier B.V 01.03.2012
• Subjects: Bands; Ca5(PO4)2SiO4; calcium; Emission; Emission analysis; Eu2+-doped phosphor; europium; Light-emitting diodes; Luminescence; Optimum concentration; phosphates; Phosphors; Photoluminescence; silicates; Wavelengths; White LED; Optimum concentration; Eu2+-doped phosphor; Ca5(PO4)2SiO4; Photoluminescence; White LED
• ISSN: 0167-577X; 1873-4979
• DOI: 10.1016/j.matlet.2011.11.088

A novel green phosphor of Eu2+-doped Ca5(PO4)2SiO4 was prepared by a solid-state reaction. The Ca5(PO4)2SiO4:Eu2+ phosphor was excited at wavelengths of 220–450nm, which was suitable for the emission band of near ultraviolet (n-UV) light emitting diode (LED) (350–430nm). In Ca5(PO4)2SiO4:Eu2+ phosphor, there were three distinguishable Eu2+ sites, which resulted in a strong green emission peaking at 530nm and broad bands up to 700nm. The effect of the activated Eu2+ concentration on the photoluminescence (PL) emission intensity of the Ca5(PO4)2SiO4:Eu2+ was also investigated. Here, a phosphor-converted LED (pc-LED) was fabricated through the integration of an InGaN-based n-UV LED and the Ca5(PO4)2SiO4:Eu2+ phosphor. All of these characteristics indicated that this phosphor had a potential application in n-UV-based white LEDs. ► Excitation of Ca5(PO4)2SiO4:Eu2+ was suitable for near ultraviolet LED. ► Emission of Ca5(PO4)2SiO4:Eu2+ had a strong green emission and up to 700nm. ► In Ca5(PO4)2SiO4:Eu2+ phosphor, there are three distinguishable Eu2+ sites. ► The optimum concentration of Eu2+ was 0.05. ► The phosphor-converted LED emitted bright yellow-green light.