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Yellow light-emitting phosphor and white light-emitting device using same

A technology of luminescent materials and emitting devices, which is applied in the direction of luminescent materials, electroluminescent light sources, lighting devices, etc.

Inactive Publication Date: 2009-01-14
NEC LIGHTING
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, these phosphors proposed in JP-A-2000-509912 do not include any phosphors emitting yellow light

Method used

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  • Yellow light-emitting phosphor and white light-emitting device using same
  • Yellow light-emitting phosphor and white light-emitting device using same
  • Yellow light-emitting phosphor and white light-emitting device using same

Examples

Experimental program
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Effect test

Embodiment

[0055] Hereinafter, the yellow-emitting phosphor according to the present invention will be described more specifically according to examples.

[0056] figure 2 It is the conventional yellow-emitting phosphor YAG:Ce (comparative example) and the yellow-emitting phosphor Ca of the present invention that are compared and measured. 0.97 AlSi 4 N 7 :Eu 0.03 (Example) Graphs of respective excitation spectra. Such as figure 2 It has been shown that the inventive yellow-emitting phosphors can be effectively excited by light having a wavelength range from 300 to 500 nm. Yellow-emitting phosphors are therefore suitable for use in combination with UV-LEDs or blue LEDs.

[0057]In the excitation spectrum of conventional YAG-type phosphors, there is a steep spectrum structure around the wavelength of 470nm, which is exactly the emission peak wavelength of blue lasers. For this reason, when blue LEDs are combined with YAG-type yellow-emitting phosphors, a color shift occurs due to...

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Abstract

Disclosed is a novel yellow light-emitting phosphor which is composed of calcium (Ca), aluminum (Al), silicon (Si), europium (Eu) and nitrogen (N), and represented by the following general formula: Ca1-xAlSi4N7:Eux. In the general formula, x is preferably within the range of 0.001 < x = 0.15. Since this yellow light-emitting phosphor emits yellow light, which is the complementary color of blue, when excited by blue light, the phosphor can be used for producing warm white light in combination with a blue light-emitting device.

Description

technical field [0001] The present invention relates to a yellow light-emitting phosphor, and a white light emitting device and lighting devices each using the yellow light-emitting phosphor. Background technique [0002] In recent years, light-emitting diodes (LEDs) have been widely used in lamps, lighting equipment, etc., and in lighting devices including backlights used in liquid crystal displays, because such LEDs are small in size, exhibit high efficacy and high brightness, and have a long life. lifespan. [0003] LEDs themselves are light sources with a single peak wavelength. The use of such LEDs as a white light or daylight color light source has been studied, and white light emitting devices using LEDs are also being developed. Research into the use of LEDs to implement white light-emitting devices includes: [0004] (a) Combining three types of LEDs: blue, green and red; [0005] (b) combining a blue LED with a fluorescent material that emits yellow light that ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K11/64C09K11/08H01L33/00H01L33/50
CPCC09K11/0883H01L33/502C09K11/7734Y02B20/181C09K11/7774Y02B20/00C09K11/77348H05B33/14C09K11/77068
Inventor 吉松良
Owner NEC LIGHTING