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Luminescent materials that emit light in the visible range or the near infrared range and methods of forming thereo

a technology of near infrared and visible ranges, applied in the field ofluminescent materials, can solve the problem of relatively insensitive photoluminescent characteristics, and achieve the effects of wide spectral width, high quantum efficiency, and easy formation

Inactive Publication Date: 2013-08-22
VOCKIC NEMANJA +3
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

[0008]Luminescent materials according to various embodiments of the invention can exhibit a number of desirable characteristics. In some embodiments, the luminescent materials can exhibit photoluminescence with a high quantum efficiency, with a narrow spectral width, and with a peak emission wavelength located within a desirable range of wavelengths, such as the visible range or the near infrared range. Also, these photoluminescent characteristics can be relatively insensitive over a wide range of excitation wavelengths. The luminescent materials can have other desirable characteristics, such as relating to their bandgap energies and electrical conductivities. Advantageously, the luminescent materials can be inexpensively and readily formed for use in solar modules and other applications.

Problems solved by technology

Also, these photoluminescent characteristics can be relatively insensitive over a wide range of excitation wavelengths.

Method used

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  • Luminescent materials that emit light in the visible range or the near infrared range and methods of forming thereo
  • Luminescent materials that emit light in the visible range or the near infrared range and methods of forming thereo
  • Luminescent materials that emit light in the visible range or the near infrared range and methods of forming thereo

Examples

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example 1

Formation of Luminescent Material—UD930

[0121]Samples of UD930 were formed in a reproducible manner by vacuum deposition in accordance with two approaches. In accordance with one approach, tin(II) iodide and cesium(I) iodide were evaporated in sequential layers, typically up to six layers total. In accordance with another approach, tin(II) chloride and cesium(I) iodide were evaporated in sequential layers, typically up to six layers total. For certain samples, a thickness of the tin(II) chloride-containing layer was about 90 nm, and a thickness of the cesium(I) iodide-containing layer was about 170 nm. Tin(II) iodide (or tin(II) chloride) was deposited by thermal evaporation, while cesium(I) iodide was deposited by electron-beam evaporation. Deposition was carried out at a pressure of about 10−5 Torr (or less) on a variety of substrates, including those formed from glass, ceramic, and silicon.

[0122]Following deposition, resulting samples were annealed in a glove box in a dry, nitrog...

example 2

Characterization of Luminescent Material—UD930

[0123]FIG. 11(a) illustrates excitation spectra obtained for UD930 at temperatures in the range of 12K to 300K, and FIG. 11(b) illustrates emission spectra obtained for UD930 in the same temperature range, according to an embodiment of the invention. As can be appreciated, a variation of the peak positions with temperature is similar for the excitation and emission spectra.

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Abstract

Luminescent materials and methods of forming such materials are described herein. In one embodiment, a luminescent material has the formula: [AaSnbXxX′x′X″x″][dopant], wherein A is included in the luminescent material as a monovalent cation; X, X′, and X″ are selected from fluorine, chlorine, bromine, and iodine; a is in the range of 1 to 5; b is in the range of 1 to 3; a sum of x, x′, and x″ is a+2b; and at least X′ is iodine, such that x′ / (a+2b)≧⅕.

Description

CROSS REFERENCE TO RELATED APPLICATIONS[0001]This application is a divisional of U.S. application Ser. No. 12 / 958,825, filed on Dec. 2, 2010, which claims the benefit of U.S. Provisional Application No. 61 / 267,756, filed on Dec. 8, 2009, the disclosures of which are incorporated herein by reference in their entirety.FIELD OF THE INVENTION[0002]The invention relates generally to luminescent materials. More particularly, the invention relates to luminescent materials that emit light in the visible range or the near infrared range and methods of forming such materials.BACKGROUND OF THE INVENTION[0003]A solar module operates to convert energy from solar radiation into electricity, which is delivered to an external load to perform useful work. A solar module typically includes a set of photovoltaic (“PV”) cells, which can be connected in parallel, in series, or a combination thereof. The most common type of PV cell is a p-n junction device based on crystalline silicon. Other types of PV ...

Claims

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Application Information

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Patent Type & Authority Applications(United States)
IPC IPC(8): H01L31/0232
CPCH01L31/055Y02E10/52H01L31/02322C09K11/616C09K11/665H10K71/164H10K85/50C23C12/02C23C14/30C23C14/024C23C14/0026C23C14/025C23C14/0694C23C14/24C23C14/5806
Inventor VOCKIC, NEMANJAWANG, JIAN JIMPFENNINGER, WILLIAMKENNEY, JOHN
Owner VOCKIC NEMANJA
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