Unlock instant, AI-driven research and patent intelligence for your innovation.

White lumination system with improved color output

A lighting system, white light technology, applied in the field of white light lighting system, can solve the problems of increasing cost and manufacturing process complexity

Inactive Publication Date: 2005-04-13
GENERAL ELECTRIC CO
View PDF0 Cites 1 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Changes in phosphor composition required add cost and complexity to the manufacturing process

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • White lumination system with improved color output
  • White lumination system with improved color output
  • White lumination system with improved color output

Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0018] In view of the problems of the prior art, it would be desirable to have a white light radiation source-luminescent material lighting system whose color output is less sensitive to errors or variations in the manufacturing process of the system, particularly in the thickness of the luminescent material. In addition, it would be desirable to have a white light radiation source-luminescent material lighting system capable of producing acceptable white light as a lamp for a wide range of color temperatures without changing the composition of the luminescent material. Preferred radiation sources include LEDs.

[0019] The inventors have found that the color output of the LED-luminescent material system is less sensitive to manufacturing errors when the line connecting the points representing the LED chromaticity coordinates and the points representing the luminescent material chromaticity coordinates approximates the BBL on the CIE chromaticity diagram . Additionally, such ...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

PropertyMeasurementUnit
emission peakaaaaaaaaaa
emission peakaaaaaaaaaa
wavelengthaaaaaaaaaa
Login to View More

Abstract

A white light lighting system including a blue LED and a luminescent material is provided. The color output of the system is improved when the line connecting the LED color coordinates and the color coordinates of the luminescent material approximates the blackbody locus on the CIE chromaticity diagram. The maximum luminous wavelength of the LED is between 470nm-500nm. The luminescent material can be (Y 1-x-z Gd x Ce z ) 3 al 5 o 12 Wherein 0.7>x>0.4, 0.1>z>0.

Description

technical field [0001] The invention relates to a white light lighting system, in particular to a ceramic YAG:Ce:Gd phosphor for converting blue light emitted by a light emitting diode (LED) into white light. Background technique [0002] White-emitting LEDs are used as backlights in liquid crystal displays and as a replacement for small traditional and fluorescent lamps. As described by S. Nakamura et al. in "The Blue Laser Diode" (The Blue Laser Diode), Section 10.4, pp. 216-221 (Springer 1997), white LEDs are produced by forming a ceramic phosphor on the output surface of a blue-emitting semiconductor LED. layer, the content of which is hereby incorporated by reference. Typically, the blue LED is an InGaN single quantum well LED, and the phosphor is cerium-doped yttrium aluminum garnet (“YAG”), Y 3 al 5 o 12 : Ce 3+ . The blue light from the LED excites the phosphor, causing it to emit yellow light. The blue light from the LED passes through the phosphor and mixes ...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
Patent Type & Authority Patents(China)
IPC IPC(8): H05B33/12C09K11/77F21V9/40F21V13/02F21Y101/02H01L33/50H01L51/50
CPCC09K11/7774H01L33/50H01L33/502H01L2224/48091H01L2924/12044Y02B20/00H01L2924/00014H01L2924/00H05B33/02H01L33/32H01L33/28H01L33/34H01L33/52H01L2933/005H01L2933/0041
Inventor A·R·杜加尔A·M·斯里瓦斯塔瓦H·A·科曼佐
Owner GENERAL ELECTRIC CO