KR100694943B1 - Purplish pink light emitting diode - Google Patents

Abstract

The pink pink light emitting diode of the present invention irradiates the red fluorescent powder coated on the surface of the LED chip with purple light having a wavelength in the range of 405 nm to 430 nm from the LED chip of the light emitting diode. The fluorescent powder is excited to generate red light having a wavelength of about 650 nm. The mixing of the original purple light from the purple light emitting diode and the excited red light results in a fresh pink or pinkish red light emitting diode of a new color tone. By using new and unique colors (similar to Hello Kitty) as backlights for electronic products such as mobile phones, or to display or illuminate them, you can attract younger customers.

Description

Purple Pink Light Emitting Diodes {PURPLISH PINK LIGHT EMITTING DIODE}

1 is a structural diagram of a lamp light emitting diode coated with a fluorescent powder layer,

2 is a diagram showing an excitation spectrum of a yellow (YAG) fluorescent powder from Nichia Corporation,

3 shows the emission spectrum of the yellow light of the Nichia Corporation fluorescent powder,

4 is a diagram showing a red light emission spectrum and an excitation spectrum of the red fluorescent powder 1 of the fresh pink light emitting diode of the present invention;

FIG. 5 is a diagram showing a red light emission spectrum and an excitation spectrum of the red fluorescent powder 2 of the fresh pink light emitting diode of the present invention; and

FIG. 6 is a view showing emission spectra of purple and red light of the pink pink light emitting diode of the present invention. FIG.

The present invention relates to a fresh pink light emitting diode.
Compared with conventional illumination light, light emitting diodes have the advantage of saving electricity, being renewable and having a long service life. With improved brightness and reduced cost, future illumination by semiconductors will be achieved.

Currently, the colors of light emitting diodes within the range of visible light include red, orange, orangeish red, yellow, yellowish green, green, blue and purple. The development of light emitting diodes with different wavelengths has become one of the important studies due to the lack of other selective mixed colors. Traditional methods of making mixed color light sources require light emitting LED chips of two or more colors sealed together. The die attach and join process involved during sealing is quite complex. In addition, because the materials of the two different color light emitting LED chips are different, the required driving voltage is also different. Therefore, one of its drawbacks is the need to add other drive currents to adjust brightness and color.

A new technique for producing multiple colors using a single light emitting diode mainly coats a layer of fluorescent powder on the surface of the LED chip such that the light emitted by the light emitting LED chip excites the layer of fluorescent powder This allows different types of light to be produced, and also to produce new colors of more wavelengths with color light from the original light emitting LED chip. For example, Nichia Corporation's patent for white light emitting diodes (US 5998925) adds a yellow (YAG) fluorescent powder to a blue light emitting diode having a wavelength of about 460 nm and uses the blue light to produce a yellow (YAG) fluorescent powder. Is excited to emit yellow light having a long wavelength of about 560 nm. As shown in Figures 2 and 3, the peaks of the excitation spectrum or the absorption spectrum are at about 460 nm. Blue light of this wavelength can excite yellow light having a spectrum of about 560 nm from the YAG fluorescent powder. Therefore, white light emitting diodes are made due to the complementary principle of yellow and blue.

The inventor of the present invention has received many LED related patents in the past. More specifically, the inventors pioneered the use of ultraviolet light to excite fluorescent powders to produce white light or various colored lights with three wavelengths, for example US 5952681 and US 5962971 and other patents in application processes.

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It is an object of the present invention to provide a diode capable of emitting a new color of purple pink light using one light emitting diode.

The pink pink light emitting diode of the present invention uses the above-mentioned principle to excite a fluorescent powder having a unique point that the light emitting LED chip uses a red fluorescent powder. The excitation spectrum (absorption spectrum) shown in Figs. 4 and 5 is 6MgO · As ₂ O ₅ : Mn in Fig. 4, and the component of red fluorescent powder 2 is 3.5MgO.0.5MgF in Fig. 4. ₂ · GeO _2: indicates that the Mn (FIG. 5). The fluorescent powder used in the present invention is an inorganic oxide having an excitation peak of about 420 nm. Purple light emitting diodes having a wavelength range of 405 nm to 430 nm are irradiated to the fluorescent powder, and purple light excites the red fluorescent powder to generate red light having a wavelength of 650 nm, and red light is the original It is mixed with the purple light generated from the light emitting LED chip to produce a fresh pink or pinkish red light emitting diode.
BRIEF DESCRIPTION OF THE DRAWINGS In order to make it easier to understand the manufacturing method and the contents of the fresh pink light emitting diode of the present invention, a detailed description of the preferred embodiment is provided along with a brief description of the drawings.
An LED chip 1 of a purple light emitting diode having a wavelength range of 405 nm to 430 nm is selected to be placed on a leader frame 2. An appropriate amount of fluorescent powder and transparent gel 3 having a component of 6MgO · As ₂ O ₅ : Mn or 3.5MgO.0.5MgF ₂ .GeO ₂ : Mn is mixed to form a fluorescent gel 4. Through the contact method, the fluorescent gel 4 is coated directly or indirectly on the LED chip 1 of the purple light emitting diode. Then it is sealed with a lamp type or surface mount type. Under excitation of purple light, the red fluorescent powder generates red light having a wavelength of about 650 nm as shown in FIGS. 4 to 5. The excited red light is mixed with purple light from the LED chip 1 of the purple light emitting diode to produce a reddish pink or pinkish red light emitting diode. 6 is an emission spectrum of a fresh pink light emitting diode, clearly showing that the peak of purple light is at about 420 nm and the peak of red light generated from the red fluorescent powder excited by purple light is at about 650 nm to 660 nm. Indicates. The amount of fluorescent powder added during the manufacturing process controls the color to make it more purple or reddish.

The most useful method of using light emitting LEDs to excite fluorescent powders is the method adopted by Nichia corporation. This excites a yellow (YAG) fluorescent powder using a blue light emitting diode, thereby generating white light having two wavelengths, or a red, blue and green mixed fluorescent powder using an ultraviolet light emitting diode. Is excited to generate white light having three wavelengths. It is a feature of the present invention to use a purple light emitting diode to excite a red fluorescent powder, thereby making a purple pink light emitting diode. By using the wavelength range of visible light for excitation, the sealed gel body is prevented from deterioration due to prolonged irradiation by ultraviolet rays. Its latest color offers more variable options for the application of light emitting diodes.

The present invention uses an oxide red fluorescent powder having desirable excitation spectra and emission efficiency in the region of purple light. The present invention has the advantage of having a long life and durability. The new single pink or pinkish red is suitable for use in consumer products such as mobile phones or PDAs for lighting or decoration of displays, backlighting. This will be a new product that will captivate female customers and the younger generation due to its wide coverage and unique color (similar to Hello Kitty's).

Of course, the embodiments described herein are merely illustrative of the principles of the invention, and various modifications thereof may be made by those skilled in the art without departing from the spirit and scope of the invention described below. Will be understood.

As described above, according to the configuration of the present invention, it is possible to configure a diode that emits fresh pink light.

Claims (3)

In a pinkish pink light emitting diode, A purple light emitting diode LED chip having a light emission wavelength of 405 nm to 430 nm, and 6 MgO.As ₂ O ₅ : Mn or 3.5MgO.0.5MgF ₂ .GeO ₂ : Mn comprising a excited red fluorescent powder having a component of, Light emitted from the purple light emitting diode LED chip having a wavelength of 405 nm to 430 nm excites the red fluorescent powder coated on the LED chip to generate red light having a wavelength of 650 nm, and the red and purple A light pink light emitting diode characterized in that light is emitted by mixing light pink light. The method of claim 1, The quantity of added red fluorescent powder controls the difference between a redr color and a purple color. The method of claim 1, The pink light emitting diode of claim 1, wherein the sealed structure of the LED chip is a lamp type or a surface mount type.

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