Nitride and oxy-nitride cerium based phosphor materials for solid-state lighting applications

a technology of cerium and phosphor materials, which is applied in the direction of discharge tube luminescnet screens, energy-saving lighting, sustainable buildings, etc., can solve the problem of reducing the energy of emission wavelengths

Inactive Publication Date: 2007-04-05
RGT UNIV OF CALIFORNIA
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, high crystal field symmetries (Ce—YAG [2]) or a strongly covalent Ce environment (sulfides or oxy-nitrides [6]) can decrease the energy of the emission wavelength.

Method used

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  • Nitride and oxy-nitride cerium based phosphor materials for solid-state lighting applications
  • Nitride and oxy-nitride cerium based phosphor materials for solid-state lighting applications
  • Nitride and oxy-nitride cerium based phosphor materials for solid-state lighting applications

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Embodiment Construction

[0040] In the following description of the preferred embodiment, reference is made to the accompanying drawings that form a part hereof, and in which is shown by way of illustration a specific embodiment in which the invention may be practiced. It is to be understood that other embodiments may be utilized and structural changes may be made without departing from the scope of the present invention.

[0041] Technical Disclosure

[0042] The subject of the present invention is the discovery of three new phosphor materials for application in white solid-state lighting based upon blue (InGaN) or UV (GaN, ZnO) LEDs. Hence, the invention covers the synthesis of yellow and blue to green emitting materials and their application as a phosphor alone or in combination with other phosphors for white LED realization. Two compositions of matter comprising Ce3+ doped compounds from the quaternary Ca—Al—Si—N system are reported to emit yellow photons under UV or blue excitation, and cerium doped Sr2SiO...

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Abstract

Three new cerium (Ce) based phosphor materials based on nitride and oxy-nitride compounds emit yellow or blue to green photons upon excitation by ultraviolet (UV) or blue light radiation. The two yellow emitting compounds belong to the quartenary Ca—Al—Si—N system with distinct structures. These bright yellow phosphors can be used for white light applications by combining either a blue light emitting diode (LED) and a yellow phosphor, a blue LED and green-orange phosphors, or an ultraviolet (UV) LED with three phosphors, i.e., red, blue and green (RGB) phosphors. The bright blue-green phosphor, which may be described by Sr2SiO4-δNδ, can be used in the UV LED plus 3 RGB phosphors setup.

Description

CROSS-REFERENCE TO RELATED APPLICATION [0001] This application claims the benefit under 35 U.S.C. Section 119(e) of the following co-pending and commonly-assigned U.S. patent applications: [0002] U.S. Provisional Application Ser. No. 60 / 722,682, filed on Sep. 30, 2005, by Ronan P. Le Toquin and Anthony K. Cheetham, entitled “NITRIDE AND OXY-NITRIDE CERIUM BASED PHOSPHOR MATERIALS FOR SOLID-STATE LIGHTING APPLICATIONS,” attorneys' docket number 30794.145-US-P1 (2005-618-1); and [0003] U.S. Provisional Patent Application Ser. No. 60 / 722,900, filed on Sep. 30, 2005, by Anthony K. Cheetham and Ronan P. Le Toquin, entitled “CERIUM BASED PHOSPHOR MATERIALS FOR SOLID-STATE LIGHTING APPLICATIONS,” attorneys' docket number 30794.138-US-P1 (2005-618-1). [0004] which applications are incorporated by reference herein. [0005] This application is related to the following co-pending and commonly-assigned applications: [0006] U.S. Utility application Ser. No. ______, filed on same date herewith, by...

Claims

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Application Information

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Patent Type & Authority Applications(United States)
IPC IPC(8): H01J1/62H01L33/50
CPCC09K11/0883H05B33/14C09K11/7721Y02B20/181H01L33/502Y02B20/00C09K11/77217C09K11/77218C09K11/77
Inventor LE TOQUIN, RONAN P.CHEETHAM, ANTHONY K.
Owner RGT UNIV OF CALIFORNIA
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