United States of America As Represented by the Secretary of the Air Force

University of Pennsylvania

University of Georgia Research Foundation, Inc.

Georgia Southern University Research and Service Foundation

George D Jia

William M Yen

Weiyi Jia

Xiaojun Wang

Rajesh R Naik

Lawrence L Brott

Laurel C Yen, Legal Representative

Linda Lewis

Compositions, methods of making compositions, materials including compositions, crayons including compositions, paint including compositions, ink including compositions, waxes including compositions, polymers including compositions, vesicles including the compositions, methods of making each, and the like are disclosed.

Phosphorescent compositions, methods of making the compositions, and methods of using the compositions

This patent covers infrared phosphorescent materials which exhibit extended persistence lifetimes and are composed of mixtures of the elements zinc, antimony, gallium, tellurium, oxygen and nitrogen, and are doped with varying amounts of chromium, neodymium, dysprosium, yttrium or thulium. A typical formula is given by ZnSbGaTeON: n % Cr, m % P, l % Q, where Zn is zinc, Sb is antimony, Ga is gallium, Te is tellurium, O is oxygen, N is nitrogen. Additionally, x (0 to 2) y (0 to 0.5) and z (0 to 1) are the molar concentration in the composition. Cris the doped chromium ion, P is a codopant and Q is a second codopant and n, m, l are the concentration respectively (m,m,l are from 0.1 to 10). An example is the material ZnSbGaTeON:3% Cr, 1% Nd, which has an emission peak at 760 nm and a persistent time of over 20 hours (measured with Fluorolog-3 spectrometer with a PMT detector).

Chromium-doped zinc-nitro-antimony-gallium-tellurium infrared phosphors

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Lock Haven, PA, United States of America

George D Jia