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Title: Red phosphors for use in high CRI fluorescent lamps

Abstract

Novel red emitting phosphors for use in fluorescent lamps resulting in superior color rendering index values compared to conventional red phosphors. Also disclosed is a fluorescent lamp including a phosphor layer comprising blends of one or more of a blue phosphor, a blue-green phosphor, a green phosphor and a red a phosphor selected from the group consisting of SrY.sub.2 O.sub.4 :Eu.sup.3+, (Y,Gd)Al.sub.3 B.sub.4 O.sub.12 :Eu.sup.3+, and [(Y.sub.1-x-y-m La.sub.y)Gd.sub.x ]BO.sub.3 :Eu.sub.m wherein y<0.50 and m=0.001-0.3. The phosphor layer can optionally include an additional deep red phosphor and a yellow emitting phosphor. The resulting lamp will exhibit a white light having a color rendering index of 90 or higher with a correlated color temperature of from 2500 to 10000 Kelvin. The use of the disclosed red phosphors in phosphor blends of lamps results in high CRI light sources with increased stability and acceptable lumen maintenance over the course of the lamp life.

Inventors:
; ; ;
Publication Date:
Research Org.:
General Electric Company, Schenectady, NY (United States)
Sponsoring Org.:
USDOE
OSTI Identifier:
1175550
Patent Number(s):
6,965,193
Application Number:
10/317,423
Assignee:
General Electric Company (Schenectady, NY) OSTI
DOE Contract Number:  
FC26-99FT40632
Resource Type:
Patent
Country of Publication:
United States
Language:
English
Subject:
37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY

Citation Formats

Srivastava, Alok, Comanzo, Holly, Manivannan, Vankatesan, and Setlur, Anant Achyut. Red phosphors for use in high CRI fluorescent lamps. United States: N. p., 2005. Web.
Srivastava, Alok, Comanzo, Holly, Manivannan, Vankatesan, & Setlur, Anant Achyut. Red phosphors for use in high CRI fluorescent lamps. United States.
Srivastava, Alok, Comanzo, Holly, Manivannan, Vankatesan, and Setlur, Anant Achyut. Tue . "Red phosphors for use in high CRI fluorescent lamps". United States. doi:. https://www.osti.gov/servlets/purl/1175550.
@article{osti_1175550,
title = {Red phosphors for use in high CRI fluorescent lamps},
author = {Srivastava, Alok and Comanzo, Holly and Manivannan, Vankatesan and Setlur, Anant Achyut},
abstractNote = {Novel red emitting phosphors for use in fluorescent lamps resulting in superior color rendering index values compared to conventional red phosphors. Also disclosed is a fluorescent lamp including a phosphor layer comprising blends of one or more of a blue phosphor, a blue-green phosphor, a green phosphor and a red a phosphor selected from the group consisting of SrY.sub.2 O.sub.4 :Eu.sup.3+, (Y,Gd)Al.sub.3 B.sub.4 O.sub.12 :Eu.sup.3+, and [(Y.sub.1-x-y-m La.sub.y)Gd.sub.x ]BO.sub.3 :Eu.sub.m wherein y<0.50 and m=0.001-0.3. The phosphor layer can optionally include an additional deep red phosphor and a yellow emitting phosphor. The resulting lamp will exhibit a white light having a color rendering index of 90 or higher with a correlated color temperature of from 2500 to 10000 Kelvin. The use of the disclosed red phosphors in phosphor blends of lamps results in high CRI light sources with increased stability and acceptable lumen maintenance over the course of the lamp life.},
doi = {},
journal = {},
number = ,
volume = ,
place = {United States},
year = {Tue Nov 15 00:00:00 EST 2005},
month = {Tue Nov 15 00:00:00 EST 2005}
}

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