CN203746900U - A white LED - Google Patents

Abstract

The utility model belongs to the technical field of LED light-emitting structures, in particular to a white light LED, which comprises a transparent substrate and a plurality of blue wafers with six faces of light emission fixedly arranged on the transparent substrate, wherein the transparent substrate is provided with a circuit layer, each blue wafer is respectively and electrically connected with the circuit layer, the transparent substrate is also provided with an anode terminal and a cathode terminal, the anode terminal and the cathode terminal are respectively and electrically connected with the circuit layer, the white light LED also comprises a glass tube embedded with yellow fluorescent powder on the tube wall, the glass tube is provided with a cavity, the blue wafers and the transparent substrate are both arranged in the cavity, the end part of the glass tube is welded on the end part of the transparent substrate, the glass sintering process is adopted, the yellow fluorescent powder is embedded into the glass tube, the fluorescent powder is more uniformly distributed, the consistency of the fluorescent powder distributed on the blue wafers is improved, the light intensity loss is reduced, in addition, the heat generated when the blue, the light emitting effect of the white light LED is improved.

Description

A white LED

technical field

The utility model belongs to the technical field of LED lighting, in particular to a white LED.

Background technique

LED is a semiconductor device that can convert electrical energy into visible light. It uses electric field luminescence and uses compound materials to make a P-N junction optoelectronic device. The advantages of long life, high luminous efficiency, no radiation and low energy consumption are widely used in the field of lighting and lighting decoration technology in today's society. The spectrum of LEDs is almost all concentrated in the visible light frequency band, and the brightness of LEDs is necessarily related to the luminous angle of LEDs. , the smaller the light emitting angle of the LED, the smaller the brightness.

The existing white light LED mainly adopts the following structure, the phosphor powder that can emit yellow light is coated on the blue chip, part of the blue light emitted by the blue chip is absorbed by the phosphor powder and emits yellow light, and the other part of the blue light is combined with the yellow light emitted by the phosphor powder Mixing, so that white light can be obtained. At present, the coating of fluorescent powder on the light-emitting wafer usually takes the glue (epoxy resin, silica gel, silicone resin, etc.) However, due to the difficulty in controlling the amount of glue applied, and the easy precipitation and uneven coating of the phosphor powder, the distribution of the phosphor powder on the light emitting chip is not uniform and the light intensity is lost. In addition, the luminescent The chip generates heat while emitting light, and the phosphor powder coated on the surface of the light-emitting chip produces color shift due to temperature rise. Therefore, it cannot be well mixed with the light emitted by the light-emitting chip to form white light, resulting in poor light output of white LEDs.

Utility model content

The purpose of the utility model is to provide a white light LED, aiming at solving the problems of large light intensity loss and poor light emitting effect of the existing white light LED.

In order to solve the above-mentioned technical problems, the utility model provides a white light LED technical solution, which includes a transparent substrate and a plurality of blue chips with six sides of light that are fixed on the transparent substrate, and the transparent substrate is provided with a A circuit layer, the circuit layer has a first positive pole and a first negative pole, the blue chip has a second positive pole and a second negative pole, the second positive pole is electrically connected to the first positive pole, and the second negative pole It is electrically connected to the first negative electrode, and the transparent substrate is also provided with a positive terminal and a negative terminal, the positive terminal is electrically connected to the first positive electrode, and the negative terminal is electrically connected to the first negative electrode. The connection also includes a glass tube with yellow fluorescent powder embedded on the tube wall, the glass tube has a cavity, the blue chip and the transparent substrate are installed in the cavity, and the end of the glass tube part is welded to the end part of the transparent substrate.

Specifically, two adjacent blue chips are connected in series, and the second positive electrode and the second negative electrode located at both ends are electrically connected to the first positive electrode and the first negative electrode respectively.

Alternatively, the second positive poles of each of the blue chips are connected together to form a positive terminal electrically connected to the first positive pole, and the second negative poles are connected together to form a positive terminal electrically connected to the first negative pole. negative extreme.

Further, it also includes a plurality of red chips for improving the display index, each of the red chips is fixed on the transparent substrate and connected in series or in parallel with the blue chip, and each of the red chips is respectively connected to the blue chip. The circuit layers are electrically connected.

Preferably, the transparent substrate is a sapphire substrate or a glass substrate.

Preferably, the circuit layer is a nickel layer or a silver layer.

Preferably, the positive terminal and the negative terminal are respectively welded to two ends of the transparent substrate.

The utility model provides a white light LED with beneficial effects that: the yellow fluorescent powder is embedded in the glass and fired into a glass tube through a sintering process, the distribution of the yellow fluorescent powder is more uniform, the uniformity of the distribution of the fluorescent powder in the glass tube is improved, and the light emission is reduced. Strong loss, when the blue chip emits light, it mixes with the yellow phosphor to form white light. In addition, the phosphor is embedded in the glass tube, and the heat generated by the blue chip during the light emitting process will not affect the working performance of the phosphor. In the prior art, the phosphor powder coated on the light-emitting chip produces color shift when heated, which affects the light output effect of the white light LED. Therefore, the white light LED provided by the utility model is more uniform in light output. The luminous blue chip is fixed on the transparent substrate, and effectively utilizes the six light-emitting surfaces of the blue chip to achieve the light output effect of the full-circumference light angle, which greatly improves the luminous flux and light output efficiency of the LED light source, and the light output rate can reach 200lm /W, to solve the problem of uneven brightness on objects illuminated by light,

Description of drawings

Fig. 1 is a three-dimensional schematic diagram of a white light LED provided in Embodiment 1 of the present utility model;

Fig. 2 is the left view of Fig. 1;

Fig. 3 is a schematic diagram of the internal structure of the white light LED provided by Embodiment 1 of the present utility model;

FIG. 4 is a schematic diagram of the internal structure of the white light LED provided by Embodiment 2 of the present invention.

Detailed ways

In order to make the purpose, technical solution and advantages of the utility model clearer, the utility model will be further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described here are only used to explain the utility model, and are not intended to limit the utility model.

The utility model is described in detail below in conjunction with specific embodiments.

Embodiment one

As shown in Fig. 1 and Fig. 2, the embodiment of the present utility model provides a white light LED 1, which includes a transparent substrate 11 and a blue chip 12 with six-sided light emitting. The blue chip 12 is fixed on the transparent substrate 11, and the transparent substrate 11 A circuit layer 13 is arranged on it, the circuit layer 13 has a first positive pole and a first negative pole, the blue chip 12 has a second positive pole and a second negative pole, the second positive pole is electrically connected to the first positive pole, and the second negative pole is connected to the first positive pole Electrically connected, that is, each blue chip 12 is electrically connected to the circuit layer 13, and the transparent substrate 11 is also provided with a positive terminal 14 and a negative terminal 15, the positive terminal 14 is electrically connected to the first positive electrode, and the negative terminal 15 is connected to the first positive electrode. The first negative electrode is electrically connected, that is, the positive terminal 14 and the negative terminal 15 are respectively electrically connected to the circuit layer 13. The white LED 1 also includes a glass tube 16. The glass tube 16 uses a glass sintering process to embed yellow phosphor powder into the glass and fire it. The fluorescent powder is fired into one body with the glass tube 16, and the fluorescent powder is evenly distributed in the tube wall of the glass tube 16, which improves the consistency of the distribution of the fluorescent powder in the glass tube 16. The glass tube 16 is in the shape of a hollow tube, and the glass tube 16 has A cavity 161, the blue chip 12 and the transparent substrate 11 are installed in the cavity 161, because the blue chip 13 emits light from six sides, the blue light emitted by the blue chip 13 and the yellow light emitted by the yellow fluorescent powder on the glass tube 16 Mix in the cavity 161 to form white light, and the mixing is more uniform. At the same time, the fluorescent powder is arranged on the glass tube 16 and is no longer coated on the blue chip 13. The heat generated by the blue chip 13 will not affect the fluorescence. The working performance of the powder solves the problem of the color shift of the phosphor powder in the prior art due to the high temperature, which leads to the poor light output effect of the white LED. The problem of strong directivity of LED light source and small light output angle can improve the luminous flux and light output efficiency of LED light source, and the light output efficiency can reach 200lm/W, which can avoid the phenomenon of uneven brightness of LED light source on the surface of objects, which is more in line with user needs. In addition, The end of the glass tube 16 forms a melting connection with the end of the transparent substrate 11. Since the two ends of the glass tube 16 are open, the transparent substrate 11 and the blue chip 12 are installed in the glass tube 16. It is necessary to close the opening of the glass tube 16. The two ends of the glass tube 16 are sintered and connected together with the end of the glass substrate 11 by fusion. There is no need to use encapsulation glue to keep the inside of the glass tube 16 sealed, so as to ensure that the white light formed after the blue chip 12 is mixed with the yellow phosphor will not Leaking from the end of the glass tube 16 further improves the light extraction rate.

As shown in Figure 1 and Figure 3, two adjacent blue chips 12 are connected in series, that is, the second positive electrode of one blue chip 12 is connected in series with the corresponding second negative electrode of the other blue chip 12 through the first wire 17 , all the blue chips 12 are connected together sequentially to form a series circuit, the blue chip 12 arranged at the head end of the series circuit leads to the second positive electrode and the blue chip 12 arranged at the end of the series circuit leads to the second negative electrode respectively connected with the circuit layer The first positive pole and the first negative pole of 13 are electrically connected. When the positive pole terminal and the negative pole terminal are connected to the external power supply, each blue chip 12 emits light at the same time.

As shown in FIG. 1, a plurality of red chips 18 are also included in the white LED. The red chips 18 can be used to improve the display index of the white LED. The red chips 18 are fixed on the transparent substrate 11 and connected in series with the blue chip 12. Or connected in parallel, each red chip 18 is electrically connected to the circuit layer 13 respectively, the light emitted by the added red chip 18, blue chip 12 and yellow phosphor is mixed and the light is softer, which improves the appearance of the white LED on the irradiated object. glare problem.

As shown in Figures 1 and 2, a circuit layer 13 is formed on the surface of the transparent substrate 11 by electroplating and evaporation process on the transparent substrate 11. Specifically, the circuit layer 13 can be a silver layer or a nickel layer, and the circuit layer 13 is used as a conductor , the circuit layer 13 communicates with an external power supply, and supplies power to the blue chip 12 to make it emit light normally. Of course, the circuit layer 13 can also be made of other conductive metals, and the transparent substrate 11 is encapsulated in the cavity 161 to protect the circuit layer 13 from The impact of the external environment, and ensure that the light emitted by the blue chip 12 is fully mixed with the light emitted by the yellow phosphor on the glass tube 16, free from external interference, and achieve the effect of uniform light emission. The blue chip 12 is bonded by an adhesive On the circuit layer 13, the bonding should be firm and not shifted. During the bonding process, it should be ensured that the adhesive will not be applied to other parts of the transparent substrate 11, so as not to affect the normal operation of the LED. Of course, it can also The flip-chip process is adopted to ensure that the blue chip 12 will not fall off during the use of the white LED.

As shown in Figure 1, the positive terminal 14 and the negative terminal 15 are soldered to both ends of the transparent substrate 11 by soldering process, and are connected to the circuit layer 13, and the positive terminal 14 and the negative terminal 15 are connected to the blue chip through the circuit layer 13. The second positive pole and the second negative pole of 12 are electrically connected, the positive pole terminal 14 and the negative pole terminal 15 are connected with the external power supply, and the circuit layer 13 transmits the current to the blue chip 12 to make it emit light normally and ensure the normal light emission of the white LED.

As shown in Figure 1, the transparent substrate 11 is a glass substrate or a sapphire substrate, and the transparent substrate 11 is used as a carrier for the blue chip 12 and the red chip 18. The transparent substrate 11 is made of a material with high light transmittance, and the blue chip 12 After the emitted light is mixed with the yellow light emitted by the fluorescent powder, white light is formed, and the high light transmittance is convenient for the emission of light. Etching the circuit structure, choosing glass or sapphire as the transparent substrate 11, the light output effect is better, and the six light output surfaces of the blue chip 12 can be effectively used to achieve the light output effect of the full-circumference light angle, which greatly improves the luminous flux of the LED light source and Light extraction efficiency, the light output rate can reach 200lm/W.

Embodiment two

As shown in Figure 4, the specific structure of embodiment two is basically the same as that of embodiment one, and the difference between the two is that the second positive electrodes of each blue chip 12 are connected together to form a positive end, and the positive end is connected to the first positive electrode. The second negative pole of each blue chip 12 is connected together to form a negative terminal, and the negative terminal is electrically connected to the first negative pole, that is, each blue chip 12 is connected in parallel through a second wire 19 to form a parallel circuit. Terminal 14, negative terminal 15 are connected with external power supply, and each blue chip 12 emits light at the same time, even if even one blue chip 12 breaks down, it will not affect the normal luminescence of white light LED, and improve the working reliability of white light LED.

The above descriptions are only preferred embodiments of the present utility model, and are not intended to limit the present utility model. Any modifications, equivalent replacements and improvements made within the spirit and principles of the present utility model shall be included in this utility model. within the scope of protection of utility models.

Claims (7)

1. A white light LED, comprising a transparent substrate and a plurality of blue chips with six-sided light emitting on the transparent substrate, the transparent substrate is provided with a circuit layer, and the circuit layer has a first positive electrode and The first negative pole, the blue chip has a second positive pole and a second negative pole, the second positive pole is electrically connected to the first positive pole, the second negative pole is electrically connected to the first negative pole, the A positive terminal and a negative terminal are also provided on the transparent substrate, the positive terminal is electrically connected to the first positive electrode, and the negative terminal is electrically connected to the first negative electrode, and it is characterized in that: it also includes a tube wall embedded A glass tube with yellow fluorescent powder, the glass tube has a cavity, the blue chip and the transparent substrate are installed in the cavity, and the end of the glass tube is welded to the transparent substrate Ends. the 2. A white light LED as claimed in claim 1, characterized in that: two adjacent blue chips are connected in series, and the second positive electrode and the second negative electrode located at the first and last ends are respectively connected to the first The positive pole and the first negative pole are electrically connected. the 3. A white light LED as claimed in claim 1, characterized in that: the second anodes of each of the blue chips are connected together to form an anode end electrically connected to the first anode, and the second The negative electrodes are connected together to form a negative terminal electrically connected to the first negative electrode. the 4. A white light LED as claimed in claim 1, further comprising a plurality of red chips for raising the display index, each of the red chips is fixed on the transparent substrate and connected with the blue The chips are connected in series or in parallel, and each of the red chips is electrically connected to the circuit layer. the 5. A white light LED according to any one of claims 1 to 4, characterized in that: the transparent substrate is a sapphire substrate or a glass substrate. the 6. A white light LED according to claim 5, wherein the circuit layer is a nickel layer or a silver layer. the 7 . The white light LED according to claim 1 , wherein the positive terminal and the negative terminal are respectively welded to two ends of the transparent substrate. 8 . the