Preparation of white light emitting diode using a phosphor

A technology of white light emitting and diode, applied in the direction of luminescent materials, electroluminescence light source, gas discharge lamp, etc.

Inactive Publication Date: 2008-04-30
KOREA RES INST OF CHEM TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0012] The present invention aims to provide a white light emitting diode capable of solving the problems of conventional white light LEDs and providing photoluminescence efficiency with a single chip and a manufacturing method thereof

Method used

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  • Preparation of white light emitting diode using a phosphor
  • Preparation of white light emitting diode using a phosphor

Examples

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Effect test

example 1

[0050] Example 1: Preparation of white light-emitting diodes using red, green, and blue phosphors

[0051] The UV LED chip is mounted on the base of the package substrate or on the lead frame with Ag paste. Next, the red, blue and green three-color phosphorescent material mixture is directly or indirectly coated on the UV LED chip, so that the purple light emitted by the UV LED chip is transmitted through the three-color phosphorescent material mixture.

[0052] That is, each of the red, blue, and green phosphorescent mixtures given in Tables 1 to 3 below was coated on the UV LED chip so that the 405nm purple light emitted by the UV LED chip was transmitted through the three-color phosphorescent material mixture.

[0053] As shown in the color coordinates given in Tables 1 to 3 and the photoluminescence spectrum given in FIG. 3 , the generation of white light was confirmed.

[0054] Table 1

[0055]

red phosphorescent

green phosphorescent

...

example 2

[0060] Example 2: Preparation of white light-emitting diodes using a mixture of red and green phosphors

[0061] Mount the blue LED chip on the base or lead frame of the packaging substrate with Ag paste. Next, the red and green two-color phosphorescent material mixture is directly or indirectly coated on the blue LED chip, so that the blue light emitted by the blue LED chip is transmitted through the two-color phosphorescent material mixture.

[0062] That is, each of the red, blue, and green phosphorescent mixtures given in Table 4 below is coated on the blue LED chip, so that the 465nm blue light emitted by the blue LED chip is transmitted through the two-color phosphorescent material mixture.

[0063] As shown in the color coordinates given in Table 4 and the photoluminescence spectrum given in Figure 4, the generation of white light was confirmed.

[0064] Table 4

[0065]

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Abstract

The present invention relates to a method for preparing a white light emitting diode (LED) using phosphors, especially to a white light emitting diode prepared by applying a tri-color phosphor material mixture of red, blue and green on a UV LED chip made of a packaging substrate, where white light is obtained by transmitting light through the tri-color phosphor mixture since the UV LED chip emits purple light. In particular, the present invention relates to a white light emitting diode prepared by laminating green and red or yellow and red phosphor materials on a blue LED chip, where white light is obtained as light is transmitted and absorbed by the phosphors. The method in accordance with the present invention is advantageous in that a white light emitting diode having superior photoluminescence efficiency can be provided using a single chip.

Description

technical field [0001] The present invention relates to a method for preparing white light-emitting diodes (LEDs) using phosphorescence, in particular to a method for coating a UV LED chip made of a packaging substrate by coating a mixture of red, blue and green phosphorescent materials. The prepared white light-emitting diode, wherein the purple light emitted by the UV LED chip is transmitted through the three-color phosphorescent mixture to obtain white light. [0002] In particular, the present invention relates to a white light emitting diode prepared by laminating green and red or yellow and red phosphor materials on a blue LED chip, wherein the phosphor transmits and absorbs light to obtain white light. Background technique [0003] Light emitting diodes have attracted attention as next-generation natural color display devices. It can be used in various electronic devices including instrument panels, televisions (TVs) and flat panel displays. [0004] Light emitting ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01L33/00H01L33/50H01L33/62
CPCH05B33/14C09K11/7786Y02B20/181H01L33/504C09K11/7731C09K11/7734H01L2224/48091H01L2224/48247H01L2224/48465H01L2224/49107H01L2224/73265H01L2224/8592H01L2224/45144H01L2924/181H01L2224/48257Y02B20/00C09K11/77342H01L2924/00014H01L2924/00H01L2924/00012B21H3/06B21H5/027
Inventor 朴晶奎金昌海金京南金在明崔京在
Owner KOREA RES INST OF CHEM TECH
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