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Determining Europium Concentration in Solids

IP.com Disclosure Number: IPCOM000078554D
Original Publication Date: 1973-Jan-01
Included in the Prior Art Database: 2005-Feb-26
Document File: 1 page(s) / 11K

Publishing Venue

IBM

Related People

Shafer, MW: AUTHOR [+2]

Abstract

A sensitive and accurate method is described for determining the concentration of Eu/3+/ in solids, which is both quick and nondestructive.

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Determining Europium Concentration in Solids

A sensitive and accurate method is described for determining the concentration of Eu/3+/ in solids, which is both quick and nondestructive.

Europium is used extensively in solid-state materials and is particularly useful as a phosphor. It is usually added in small concentrations to a host lattice and then reacted at high temperatures. The europium may go into the host lattice as either Eu/2+/ or Eu/3+/. Since Eu/3+/ is usually the species of interest for phosphors, it is important to know its concentration in the solid. Normally, this is determined by wet chemical methods which are slow, destructive, and not very accurate for small concentrations.

Infrared absorption may be used for determining the Eu/3+/ concentration. The presence of Eu/3+/ may be identified be the presence of sharp absorption lines near 3100 cm/-1/ and 4900 cm/-1/, which are associated with the 4f/6/(/7/F(j)) multiplet levels of Eu/3+/. This technique has been employed to detect Eu/3+/ concentrations as low as approx. 0.1% in the host EuO. The technique may be readily extended to detect other rare earths e.g. Sm/2+/, Sm/3+/, Tb/3+/, Nd/3+/, Pr/3+/ and Dg/3+/.

In addition to being very sensitive and accurate, this technique is nondestructive. Concentration determination may be accomplished in a few minutes and the necessary equipment is readily available commercially.

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