Article ID Journal Published Year Pages File Type
1621351 Journal of Alloys and Compounds 2009 5 Pages PDF
Abstract

Synthesis of a near ultraviolet light emitting phosphor β-Ca1.95P2O7:0.05Eu2+ for white LEDs by combustion method is reported. The photoluminescence, powder analysis and particle morphology of the phosphors were investigated using a luminescence spectrometer (LS), X-ray diffractometry (XRD) and transmission electron microscopy (TEM). It was found that when the initiating combustion temperature reached 1000 °C, the phase of γ-Ca(PO3)2 which begun to appear at 700 °C, transformed into the target material – the phase of β-Ca2P2O7. And the phase transition leads to a red shift of the emission peak about 9 nm. TEM images also confirm those results. The emission spectrum shows a single intense band centered at 421 nm while the excitation spectrum is a broad band extending from 250 nm to 410 nm, with two bands centered at 330 nm and 387 nm. The band at 387 nm is a main excitation peak matching the emission of near ultraviolet light (370–410 nm). The investigated phosphor is suitable for a NUV LED excitation.

Related Topics
Physical Sciences and Engineering Materials Science Metals and Alloys
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