Luminescence properties of Ca-5(PO4)(2)SiO4:Eu2+ green phosphor for near UV-based white LED

초록

A novel green phosphor of Eu2+-doped Ca-5(PO4)(2)SiO4 was prepared by a solid-state reaction. The Ca-5(PO4)(2)SiO4:Eu2+ phosphor was excited at wavelengths of 220-450 nm, which was suitable for the emission band of near ultraviolet (n-UV) light emitting diode (LED) (350-430 nm). In Ca-5(PO4)(2)SiO4:Eu2+ phosphor, there were three distinguishable Eu2+ sites, which resulted in a strong green emission peaking at 530 nm and broad bands up to 700 nm. The effect of the activated Eu2+ concentration on the photoluminescence (PL) emission intensity of the Ca-5(PO4)(2)SiO4: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 Ca-5(PO4)(2)SiO4:Eu2+ phosphor. All of these characteristics indicated that this phosphor had a potential application in n-UV-based white LEDs. (C) 2011 Elsevier B.V. All rights reserved.

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