E.i. Dupont De Nemours and Company

Michael Karl Crawford

Kurt Richard Mikeska

Frank L Schadt, Iii

Fredrick Claus Zumsteg, Jr

Andrew Edward Feiring

Jerald Feldman

Lynda Kaye Johnson

Michael Fryd

Hoang Vi Tran

Larry L Berger

Changzai Chi

The present invention is directed to rare-earth doped solid state solutions of alkaline earth fluorides having novel luminescence properties, and to a process for preparing them. The invention is useful as identifying markers on articles. Other uses include phosphors for plasma displays, optical frequency multipliers, optical amplifiers and the like.

Rare-earth doped fluorides and process for preparing

The invention is directed to a composition having a carrier matrix, and a particulate luminescent composition dispersed therein, the particulate luminescent composition comprising a rare-earth-doped solid-state solution of alkaline earth fluorides represented by the chemical formulaRE(CaSrBa)FOwherein RE represents a three-valent rare-earth element, 0.005&#x2266;x&#x2266;0.20, and 0&#x2266;y&#x2266;0.2, a+b+c=1, with the proviso at least two of a, b, and c are not equal to zero; the particulate luminescent composition exhibiting a luminescence spectrum having a plurality of intensity peaks at characteristic wavelengths. It is further directed to a process by contacting a surface with the composition and articles made therefrom.

Coating compositions, process and luminescent coated articles

The invention is directed to a composition having a carrier matrix, and a particulate luminescent composition dispersed therein, the particulate luminescent composition comprising a rare-earth-doped alkaline earth fluoride represented by the formulaREAFOwherein RE represents a three-valent rare-earth element, A is alkaline earth, 0.002&#x2266;x&#x2266;0.20, and 0&#x2266;y&#x2266;x; the particulate luminescent composition exhibiting a luminescence spectrum having a plurality of intensity peaks at characteristic wavelengths. It is further directed to a process by contacting a surface with the composition and articles made therefrom.

Coatable compositions, coatings prepared therefrom, process and luminescent coated articles

The invention is directed a composition represented by the chemical formula EuAFOwherein A is alkaline earth, 0.002&#x2266;x&#x2266;0.20, and 0&#x2266;y&#x2266;x; the composition exhibiting a luminescence spectrum characterized by peaks at 592&#xb1;2 nm and 627&#xb1;2 nm, wherein the ratio of the peak intensity at 592&#xb1;2 nm to that at 627&#xb1;2 nm is at least 5% larger than the corresponding peak intensity ratio at the same wavelengths of a first corresponding reference composition with the same value of x that has not been exposed to a temperature above 100&#xb0; C., and wherein said ratio of the peak intensity at 592&#xb1;2 nm to that at 627&#xb1;2 nm is at least 5% smaller than the corresponding peak intensity ratio at the same wavelengths of a second corresponding reference composition with the same value of x that has been subject to heating to 900&#xb0; C. for 6 hours.

The invention is directed to a method by exposing at least a portion of a luminescent coating disposed on a surface of an article to ultraviolet light at one or more preselected wavelengths causing said luminescent coating to exhibit a luminescence spectrum, the luminescence spectrum exhibiting a plurality of intensity peaks that have been priorly determined to create a standard; determining the intensity of at least two peaks in the luminescence spectrum of the coating; determining a peak intensity ratio of the at least two peaks; comparing the peak intensity ratio determined with the standard; and, classifying the article according to whether or not the peak intensity ratio does or does not match the standard; wherein the luminescent coating comprises a particulate luminescent composition comprising a rare earth doped fluoride represented by the formulaREAFOwherein RE represents a three-valent rare-earth element, A is alkaline earth, 0.002&#x2266;x&#x2266;0.20, and 0&#x2266;y&#x2266;x.

Method for identifying articles and process for maintaining security

The invention is directed to a method by exposing at least a portion of a luminescent coating disposed on a surface of an article to ultraviolet light at one or more preselected wavelengths causing said luminescent coating to exhibit a luminescence spectrum, the luminescence spectrum exhibiting a plurality of intensity peaks that have been predetermined to create a standard; determining the intensity of at least two peaks in the luminescence spectrum of the coating; determining a peak intensity ratio of the at least two peaks; comparing the peak intensity ratio determined with the standard; and, classifying the article according to whether or not the peak intensity ratio does or does not match the standard; wherein the luminescent coating is a particulate luminescent composition comprising a rare earth doped fluoride represented by the chemical formulaRE(CaSrBa)FOwherein RE represents a three-valent rare-earth element, 0.005&#x2266;x&#x2266;0.20, and 0&#x2266;y&#x2266;0.2, a+b+c=1, with the proviso at least two of a, b, and c are not equal to zero; the particulate luminescent composition exhibiting a luminescence spectrum having a plurality of intensity peaks at characteristic wavelengths.

The present invention relates to novel unsaturated polycyclic compounds containing two fluoroalcohol substitutents. This invention also relates to homopolymers and copolymers derived from such unsaturated polycyclic compounds. The copolymers are useful for photoimaging compositions and, in particular, photoresist compositions (positive-working and/or negative-working) for imaging in the production of semiconductor devices. The polymers are especially useful in photoresist compositions having high UV transparency (particularly at short wavelengths, e.g., 157 nm) which are useful as base resins in resists and potentially in many other applications.

Photoresists comprising polymers derived from fluoroalcohol-substituted polycyclic monomers

A fluorine-containing polymer prepared from at least a spacer group selected from the group consisting of ethylene, alpha-olefins, 1,1'-disubstituted olefins, vinyl alcohols, vinyl ethers, and 1,3-dienes; and a norbornyl radical containing a functional group containing the structure: &#x2014;C(R)(R)Orwherein Rand Rare the same or different fluoroalkyl groups of from 1 to about 10 carbon atoms or taken together are (CF)wherein n is an integer ranging from 2 to about 10 and Ris a hydrogen atom or an acid- or base-labile protecting group; r is an integer ranging from 0-4. The fluorine-containing polymer has an absorption coefficient of less than 4.0 mm&#x2212;at a wavelength of 157 nm. These polymers are useful in photoresist compositions for microlithography. They exhibit high transparency at this short wavelength and also possess other key properties, including good plasma etch resistance and adhesive properties.

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Glen Mills, PA, United States of America

Michael Karl Crawford