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Organic red luminescent material for white light LED packaging

A technology of LED encapsulation and red fluorescence, which is applied in the field of preparation of organic red fluorescent materials and materials, and can solve the problems of affecting the luminous efficacy of devices, demanding aging performance of packaging materials, and low light conversion efficiency.

Inactive Publication Date: 2006-12-20
DALIAN LUMINGLIGHT SCIENCE & TECHNOLOGY CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Its excitation wavelength is between 200 and 300nm, which cannot be used for the packaging of blue light chips
CN1186835A provides a preparation method of an organic complex light conversion agent. The excitation spectrum of the material introduced in this patent is mainly concentrated in the ultraviolet region of 240-420nm. It is mainly used in agricultural film light conversion agents and cannot be used for the packaging of blue light chips.
Chinese patents CN1066857A and CN1327027A provide a method for preparing a light conversion agent for organic pigments, but the light conversion efficiency of this material is too low to be suitable for packaging
Inorganic materials have high stability, but they seriously cover the blue light chip, which affects the luminous efficacy of the device
Chinese patent application numbers 02102076, 03149752.7, and 03149751.9 are all packaged on ultraviolet light chips with pure inorganic materials to produce white light. The wavelength of ultraviolet light is relatively short, and the aging performance requirements for packaging materials are more stringent. In addition, the life of the device will be greatly shortened. Difficult to industrialize

Method used

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  • Organic red luminescent material for white light LED packaging
  • Organic red luminescent material for white light LED packaging
  • Organic red luminescent material for white light LED packaging

Examples

Experimental program
Comparison scheme
Effect test

example 1

[0042] Take by weighing 8.96 grams of dibenzoylmethane, be dissolved in 100ml of acetone, be defined as solution A, and take by weighing rare earth nitrate Eu(NO 3 ) 3 3.38 grams, dissolved in 20ml of deionized water, designated as solution B, heated solution A to 50°C, and added solution B dropwise to A under the stirring condition of 100 rpm, and used 0.1 mol / liter of dilute NaOH solution The pH value of the system was adjusted to 6.5, and the reaction was continued for 1 hour while maintaining the temperature and stirring, and a light yellow precipitate was obtained. Filter the precipitate, wash with ethanol and water three times respectively, and dry in a vacuum oven at 60°C for 20 hours to obtain the finished product.

[0043]Its absorption and emission spectra are shown in the appendix figure 1 .

[0044] The spectrum of the compound described in Example 1 and YAG powder mixed by 1:1 under the excitation of blue light at 465nm is shown in the appendix figure 2 .

example 2

[0046] Take by weighing 6.73 grams of dibenzoylmethane, dissolve it in 100ml of acetone, and set it as solution A, take by weighing 7.07 grams of triisooctylamine, dissolve it in 100ml of ethanol, set it as solution B, and take by weighing rare earth nitrate Eu(NO 3 ) 3 3.38 grams, dissolved in 20ml of deionized water, defined as solution C, mixed solutions A and B, heated to 60°C, and added solution C dropwise to the mixed solution of A and B under the condition of 300 rpm, and used The pH value of the system was adjusted to 7.0 with 0.1 mol / L dilute NaOH solution, and the reaction was continued for 6 hours while maintaining the temperature and stirring, and a light yellow precipitate was obtained. Filter the precipitate, wash with ethanol, acetone, and water three times, and dry in a vacuum oven at 40°C for 24 hours to obtain the finished product.

[0047] Its absorption and emission spectra are shown in the appendix image 3 .

[0048] The spectrum of the compound descri...

example 3

[0050] Take by weighing 6.70 grams of α-thiophene trifluoroformyl acetone, dissolve it in 100 ml of ethanol, and call it solution A; weigh 1.98 grams of 1,10-phenanthroline, dissolve it in 50 ml of ethanol, and call it solution B, call it Take rare earth nitrate Eu(NO 3 ) 3 3.38 grams, dissolved in 20ml of deionized water, defined as solution C, mixed solutions A and B, heated to 60°C, and added solution C dropwise into the mixed solution of A and B under the condition of 200 rpm, and used The pH value of the system was adjusted to 5.5 with 0.1 mol / L dilute NaOH solution, and the reaction was continued for 4 hours while maintaining the temperature and stirring, and a light red precipitate was obtained. Filter the precipitate, wash with ethanol, acetone, and water three times, and dry in a vacuum oven at 80°C for 24 hours to obtain the finished product.

[0051] Its absorption and emission spectra are shown in the appendix Figure 5 .

[0052] The spectrum of the compound d...

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Abstract

This invention provides an organic red fluorescent material and method for making same, belonging to the luminescent and display technology field. This fluorescent material can emit bright red light by the radiation of 450-470nm blue light chip, with the maximum value of the emission spectrum near 613nm. This invented material can be mixed with YAG powder and coated on the blue light chip via carrier resin to improve the colouration index of the white light LED elements.

Description

technical field [0001] The invention relates to the technical field of light emission and display, and provides an organic red fluorescent material used for white LED packaging and a preparation method of the material. Background technique [0002] With the emergence of large-scale energy crises in various countries around the world, the development of the fourth generation of electric light source lighting - white LED devices has become the focus of research by various countries. As a substitute for traditional lighting, white light LED devices are expected to have broader prospects due to their high efficiency, energy saving, and long service life. [0003] The packaging of existing white light LEDs mainly adopts blue light chip and YAG powder package or ultraviolet chip and RGB tricolor phosphor powder package to generate white light. The color rendering index of white LED devices packaged with blue chips and YAG powder is low, and there is a yell...

Claims

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Application Information

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IPC IPC(8): C09K11/06H01L33/00H01L33/50
CPCY02B20/181Y02B20/00
Inventor 徐长富李茂龙于晶杰罗昔贤熊楚耀常英肖志国
Owner DALIAN LUMINGLIGHT SCIENCE & TECHNOLOGY CO LTD
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