Cerium Based Phosphor Materials for Improved Light Quality in LEDs

•    Improved efficiency •    Improved light quality

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Researchers at the University of California, Santa Barbara have discovered a novel luminescent cerium compound that emits bright red light when used as a phosphor. This compound can be applied to enhance the light quality of systems using a blue LED with a yellow/green phosphor. It can also be utilized as the red phosphor in a system using a UV LED and RGB phosphors. Due to the chemical makeup, there is a decrease of the emission wavelength towards the yellow/orange region and thus it can be used directly as the yellow phosphor with a blue LED.

Patent Number: US20070159066A1
Application Number: US2006541708A
Inventor: Cheetham, Anthony, K. | Le Toquin, Ronan, P.
Priority Date: 30 Sep 2005
Priority Number: US20070159066A1
Application Date: 2 Oct 2006
Publication Date: 12 Jul 2007
IPC Current: H01J000162 | H01J006304 | H01L003350
US Class: 313503 | 313512
Assignee Applicant: The Regents of the University of California
Title: Cerium based phosphor materials for solid-state lighting applications
Usefulness: Cerium based phosphor materials for solid-state lighting applications
Summary: For solid state lighting application apparatus.
Novelty: Solid state lighting application apparatus has luminescent cerium compound, which emits orange or red light when excited by radiation from LED

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Background

LEDs based on wide band gap semiconductor materials such as GaN or InGaN produce UV/blue light with high efficiency and long lifetimes. This light can be converted into needed colors using the luminescence properties of phosphor materials. Therefore, white LED devices can be created by combining either a blue LED and a yellow phosphor or a UV LED with Red/Green/Blue (RGB) phosphors. Consequently, new discoveries in yellow and red phosphors are essential for improving the efficiency and light quality of LED-based solid state lighting devices. Cerium-based compounds usually emit UV or blue light with few exceptions in the green/yellow region, but cannot be used to emit bright red light.

 

 

Tech ID/UC Case

23414/2005-618-0

Related Cases

2005-618-0

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