TWM495622U - Light-emitting diode - Google Patents

Abstract

The disclosure provides a light-emitting diode device including a base; a light-emitting chip disposed in the base; a phosphor encapsulant, which covers the light-emitting chip and contains a phosphor dispersed therein; and a wiring structure electrically connected to the light-emitting chip. The light-emitting diode is featured in that the phosphor is prepared by a method including a step of adding acetone.

Description

Light-emitting diode device

This creation is about a light-emitting diode device.

In recent years, countries have increased their awareness of environmental protection and have invested in energy conservation research. Light-emitting diodes (LEDs) with low power consumption and long life are one of the most important developments in the field of lighting.

At present, the development of global LEDs is dominated by white LEDs and high-brightness LEDs. White LEDs have the advantages of small size, environmental protection, heat generation and low power consumption, and can be fabricated into large-size array light-emitting modules, thus becoming a new generation. Source of illumination.

The development of white LEDs began with Nichia Corporation's blue indium gallium nitride light emitting diode (InGaN LED) with cerium doped yttrium aluminum garnet (Y ₃ Al ₅ O ₁₂ :Ce; YAG) :Ce) Yellow fluorescent powder. After absorbing the light of 450~470nm wavelength (blue light spectrum range), YAG phosphor powder can generate light with wavelength of 550~560nm, and use the principle of complementary light of blue light and yellow light to produce high brightness white light by mixing light. The use of YAG phosphor powder with blue LED chips is still one of the most commonly used methods in the industry to manufacture white LEDs. The white LEDs manufactured in this way have the advantages of low cost and simple power supply loop structure.

However, in order to make up for the lack of red light in the YAG phosphor powder, the white LED process with red phosphor powder has become a new topic. In recent years, the industry is committed to developing a red with a narrow half-height and a high intensity. The light-emitting phosphor, for example, Na ₂ SiF ₆ :Mn ⁴⁺ fluorescent powder proposed by Shim-Etsu Chemical, has a crystal space group of P321 and a light-emitting wavelength of about 630 nm.

White LED with red fluorescent powder has high brightness and illumination The efficiency further enhances the quality and performance of white LEDs. Therefore, the production of red fluorescent powder with high yield and high luminous efficiency is one of the important goals of current LED development.

The invention provides a light emitting diode device, comprising a base; a light emitting diode chip disposed in the base; a fluorescent glue material covering the light emitting diode chip, and the fluorescent powder being dispersed in the fluorescent glue material And a wire structure electrically connected to the light emitting diode chip, wherein the light emitting diode device is characterized in that the method for preparing the phosphor powder comprises the step of adding acetone.

10‧‧‧Lighting diode device

12‧‧‧ Pedestal

14‧‧‧Light Emitting Diode Wafer

16‧‧‧Fluorescent glue

18‧‧‧Fluorescent powder

20‧‧‧Wire structure

100‧‧‧How to prepare fluorescent powder

102~110‧‧‧Steps for preparing the phosphor powder

The embodiments of the present invention are described in detail below with reference to the accompanying drawings, in which the following illustrations are not drawn to scale. In fact, the dimensions of the elements may be arbitrarily enlarged or reduced so as to clearly represent the features of the present invention. In the description and drawings, the same or similar elements will be denoted by like reference numerals.

Fig. 1 is a schematic view showing a light-emitting diode device according to an embodiment of the present invention.

Fig. 2 is a flow chart showing the steps of a method for preparing a phosphor powder in a light-emitting diode device according to an embodiment of the present invention.

Fig. 3 is a diagram showing the X-ray powder diffraction pattern of the phosphor powder in the light-emitting diode device in an embodiment of the present invention.

Fig. 4 is a view showing the light emission spectrum of the phosphor powder in the light-emitting diode device using a photoluminescence spectrometer (PL) in some embodiments.

Figure 5 is a schematic representation of the white light spectrum of YAG yellow powder plus M ₂ ZF ₆ :Mn ⁴⁺ red powder and blue light wafer in the examples.

Figure 6 is a representation of the present embodiment. The spectral data of Figure 5 is converted using the Commission Internationale de L'Éclairage (CIE) software to obtain its actual chromaticity coordinate map.

Many different implementations or examples are disclosed below to implement the various features of the present invention. The specific elements and their permutations are described below to illustrate the present invention. Of course, these are only examples and should not limit the scope of this creation.

The present invention provides a light-emitting diode device characterized in that the method for preparing the phosphor powder in the light-emitting diode device utilizes the step of adding acetone to increase the yield and luminous efficiency of the phosphor powder, thereby improving the light-emitting diode. The performance of the body device.

1 is a schematic view of a light-emitting diode device 10 according to an embodiment of the present invention. Intended to include: a susceptor 12; a light-emitting diode chip 14 disposed in the susceptor 12; a phosphor paste 16 covering the LED chip 14, and the phosphor powder 18 dispersed in the fluoroplastic material And a wire structure 20 electrically connected to the LED chip 14. In one embodiment, the LED device 10 is characterized in that the method for preparing the phosphor powder 18 includes a step of adding acetone, and the prepared phosphor powder 18 has a better yield and luminescence by the addition of acetone. Efficiency, and other components of the LED device 10 (eg, pedestal, light-emitting diode wafer, fluorescent glue, etc.) can be made by any person skilled in the art using any of the conventional materials and methods, for example, see the Republic of China patent M407494 European Patent No. EP 1 930 959 A1, US Patent No. 20080029720 A1, for the sake of simplicity of explanation, will not be described herein, and only the preparation method of the phosphor powder 18 will be described in detail below.

In one embodiment, the phosphor powder 18 has the chemical formula: M ₂ ZF ₆ :Mn ⁴⁺ , wherein M is an alkali metal element selected from sodium (Na) or potassium (K), and Z is selected from bismuth (Si) or A tetravalent element of titanium (Ti). 2 is a flow chart showing the steps of the method 100 for preparing the phosphor powder 18 in an embodiment.

First, in step 102, a first solution containing a fluoride of a tetravalent element Z and a manganese compound is prepared. In one embodiment, the oxide, hydroxide or carbonate of the tetravalent element Z, as well as the manganese compound, may be dissolved in a hydrofluoric acid (HF) solution to formulate the first solution. In one embodiment, the oxide of the tetravalent element Z may be cerium oxide (SiO ₂ ) or titanium dioxide (TiO ₂ ); the hydroxide of the tetravalent element Z may be Si(OH) ₄ or Ti(OH) ₄ The carbonate of the tetravalent element Z may be Si(CO ₃ ) ₂ or Ti(CO ₃ ) ₂ ; and the manganese compound may be disodium hexafluoro manganese (Na ₂ MnF ₆ ) or hexafluoro manganese dipotassium (K ₂ MnF) ₆ ), but not limited to this.

In one embodiment, the fluoride of the tetravalent element M in the first solution The concentration may be 0.1 to 3 mol/L, preferably 0.2 to 1.0 mol/L, and the concentration of the manganese compound may be 0.01 to 0.1 mol/L, preferably 0.03 to 0.06 mol/L, and the hydrofluoric acid solution The concentration may be from 0.1 to 30 mol/L, preferably from 20 to 30 mol/L.

Next, in step 104, a compound containing an alkali metal element M is provided. In one embodiment, the compound of the alkali metal element M can be dissolved in a hydrofluoric acid solution to form a second solution, which is then mixed with the first solution in step 106 to produce a reaction. In another embodiment, a compound of the alkali metal element M in solid form can also be used directly. Further, the compound of the above alkali metal element M may be a sulfate (for example, Na ₂ SO ₄ or K ₂ SO ₄ ), a carbonate (for example, Na ₂ CO ₃ or K ₂ CO ₃ ), or a nitrate (for example, NaNO _{3 ).} Or KNO ₃ ), hydroxide (for example: NaOH or KOH), fluoride (for example: NaF or KF) or hydrofluoride (for example: NaHF ₂ or KHF ₂ ), but is not limited thereto.

In one embodiment, the concentration of the compound of the alkali metal element M may be at least 1 mol/L, for example, the concentration of Na ₂ SO ₄ may be at least 1.2 mol/L, and the concentration of Na ₂ CO ₃ may be at least 1.2 mol/L. The concentration of NaOH may be at least 1.6 mol/L. The concentration of the hydrofluoric acid solution may be from 0.1 to 30 mol/L, preferably from 20 to 30 mol/L.

Furthermore, in step 106, in an embodiment, the foregoing Mixing a solution with a second solution of a compound containing an alkali metal element M, or directly adding a compound of the alkali metal element M in a solid form to the first solution to make a fluoride, a manganese compound, and an alkali metal element of the tetravalent element Z The compound of M produces a reaction to form Forming a precipitate, the reaction is an exothermic reaction, so that the compound (or the second solution) of the alkali metal element M in a solid form is slowly added to the first solution more slowly. Further, the above reaction temperature may be from 20 ° C to 60 ° The range of °C, for example: 25 °C.

Next, in step 108, the solution is dissolved in the above step 106. Acetone was added to the solution. In one embodiment, in the case where step 106 is to mix the first solution and the second solution, the amount of acetone added may be 40% to 160% of the total volume of the first solution and the second solution, preferably the first solution. And 80% to 120% of the total volume of the second solution, for example: 100%. In another embodiment, in the step 106, when the compound of the alkali metal element M in a solid form is directly added to the first solution, the acetone may be added in an amount of 100% to 250% of the volume of the first solution, preferably The first solution volume is from 180% to 220%, for example: 200%. It is worth noting that the addition of acetone to the solution reacted in step 106 can significantly increase the yield and luminous efficiency of the finally produced phosphor powder. In one embodiment, the yield of the phosphor powder can reach 55%. the above. Although the inventors have found that the addition of ethanol can be used to increase the yield of the phosphor powder, ethanol can destroy the phosphor powder. In contrast, the use of acetone in the present invention can both increase the yield of the phosphor powder and avoid destroying the fluorescent powder. powder. In addition, the inventors have unexpectedly discovered that the addition of acetone increases the crystallinity of the phosphor.

Finally, in step 110, the precipitates generated in steps 106 and 108 are collected by conventional techniques such as filtration and drying, and the collected precipitates are the phosphor powder M ₂ ZF ₆ : Mn ⁴⁺ of the present invention. . In one embodiment, the phosphor can be dried at a temperature ranging from 40 ° C to 80 ° C (eg, at 60 ° C).

Example 1

4.8 g of cerium oxide (SiO ₂ ) and 1.1 g of hexafluoromanganese dipotassium (K ₂ MnF ₆ ) were dissolved in 100 mL of a 48 wt% hydrofluoric acid (HF) solution, and 17.04 g of sodium sulfate (Na) ₂ SO ₄ ) slowly added to the above solution, followed by adding 100 mL of acetone, and then filtering the precipitate formed by the reaction, and placing it in an oven at 60 ° C for drying to obtain a fluorescent powder Na ₂ SiF ₆ : Mn ⁴⁺ . The yield of the phosphor powder was calculated to be 57%.

Comparative example 1

The preparation method was the same as in Example 1, except that acetone was not added, and the yield of the obtained fluorescent powder Na ₂ SiF ₆ :Mn ⁴⁺ was 40%.

The above-prepared Na ₂ SiF ₆ :Mn ⁴⁺ was identified by a powder X-ray diffractometer to obtain an X-ray powder diffraction pattern as shown in Fig. 2, and a standard map of the JCPDS (Joint Committee on Powder Diffraction Standards) was compared. In the inorganic crystal structure database (ICSD) shown in Fig. 2, it is known that the prepared phosphor powder is a pure phase, and the space group of the crystal system belongs to P321, and has a crystal structure corresponding to Na ₂ SiF ₆ .

Further, the luminescence spectrum of the phosphor powder Na ₂ SiF ₆ :Mn ⁴⁺ prepared in Example 1 and Comparative Example 1 was measured using a photoluminescence spectrometer (PL). The optical laser spectrometer is a non-destructive detection technique for measuring the excitation and emission bands of a sample. The principle is to use an excitation source to make the electrons of the sample transition from the ground state to the excited state. When the electron returns to the ground state, the energy is released in the form of light energy. The optical properties of the sample were measured by measuring the light emission characteristics. In operation, the measurement of the emission spectrum is performed by fixing the excitation wavelength (λ ex ) to a specific value and detecting the emission spectrum. Measurement Results As shown in Fig. 4, the phosphor powder prepared in Example 1 had a higher luminous intensity than Comparative Example 1.

As can be seen from the above, the fluorescent light in the light-emitting diode device of the present invention The powder is added with an appropriate amount of acetone during the preparation process, so that the prepared phosphor powder has better luminous efficiency, and can also increase the yield and crystallinity of the phosphor powder.

In addition, the phosphor powder prepared in Example 1 was mixed with YAG phosphor powder, and was actually packaged on a blue light wafer, and the white light spectrum was measured. The result was as shown in FIG. 5, and the light was emitted at a current of 200 mA. The efficiency is 77.6 lmW ^-1 , the CRI is 86, and R9 = 61.

Next, use the spectrum data of Figure 5 to use the Commission. The Internationale de L'Éclairage (CIE) conversion software obtains its chromaticity coordinates as (x = 0.3126, y = 0.2951), as shown in Figure 6.

Although the present invention has been disclosed in the above preferred embodiments, it is not intended to limit the present invention, and any person skilled in the art can make any changes without departing from the spirit and scope of the present invention. And the retouching, therefore, the scope of protection of this creation is subject to the definition of the scope of the patent application attached.

100‧‧‧How to prepare fluorescent powder

102~110‧‧‧Steps for preparing the phosphor powder

Claims (13)

A light-emitting diode device includes: a pedestal; a light-emitting diode chip disposed in the pedestal; a fluorescent glue material covering the light-emitting diode chip, and a phosphor powder dispersed therein In the fluorescent glue material; and a wire structure electrically connecting the light emitting diode chip, the light emitting diode device is characterized in that the method for preparing the phosphor powder comprises a step of adding acetone. The light-emitting diode device according to claim 1, wherein the phosphor powder has the following chemical formula: M ₂ ZF ₆ : Mn ⁴⁺ wherein M is an alkali metal element selected from sodium or potassium, and Z is selected from a tetravalent element of barium or titanium, and the method for preparing the phosphor powder comprises: (a) providing a first solution comprising the fluoride of the tetravalent element Z and optionally from disodium hexafluoromanganese ( a manganese compound of Na ₂ MnF ₆ ) or hexafluoromanganese dipotassium (K ₂ MnF ₆ ); (b) a compound providing an alkali metal element M selected from the group consisting of sulfates, carbonates, nitrates, hydroxides, fluorine a compound or a hydrofluoride; (c) mixing the first solution and the alkali metal element M to form a precipitate; (d) after the step (c), adding acetone to the first solution; And (e) collecting the precipitate of the first solution after the step (d). The light-emitting diode device of claim 2, wherein in the step (a) of the method for preparing the phosphor powder, the first solution is an oxide or hydroxide of the tetravalent element Z or The carbonate and the manganese compound are formed by dissolving in a hydrofluoric acid solution (HF). The light-emitting diode device of claim 2, wherein the step (b) of the method for preparing the phosphor powder further comprises providing a second solution which is a compound of the alkali metal element M Formed in a solution of hydrofluoric acid. The light-emitting diode device of claim 4, wherein in the step (d) of the method for preparing the phosphor powder, the amount of acetone added is 40% of the total volume of the first solution and the second solution. % to 160%. The light-emitting diode device of claim 5, wherein in the step (d) of the method for preparing the phosphor powder, the amount of acetone added is 80% of the total volume of the first solution and the second solution. % to 120%. The light-emitting diode device of claim 2, wherein the step (b) of the method for preparing the phosphor powder further comprises providing a compound of the alkali metal element M in a solid form. The light-emitting diode device according to claim 7, wherein in the step (d) of the method for preparing the phosphor powder, the amount of acetone added is 100% to 250% of the first solution. The light-emitting diode device according to claim 8, wherein in the step (d) of the method for preparing the phosphor powder, the amount of acetone added is from 180% to 220% of the first solution. The light-emitting diode device according to claim 2, wherein the reaction temperature of the method for preparing the phosphor powder is in the range of 20 ° C to 60 ° C. The light-emitting diode device according to claim 1, wherein the chemical formula of the phosphor powder is Na ₂ SiF ₆ :Mn ⁴⁺ . The light-emitting diode device according to claim 2, wherein in the step (a) of the method for preparing the phosphor powder, the first solution is bismuth dioxide and hexafluoromanganese dipotassium dissolved in hydrogen Formed by a hydrofluoric acid solution. The light-emitting diode device according to claim 2, wherein in the step (c) of the method for preparing the phosphor powder, a solid form of sodium sulfate (Na ₂ SO ₄ ) is added to the first solution. in.