WO2012009918A1

WO2012009918A1 - White light source module using leds

Info

Publication number: WO2012009918A1
Application number: PCT/CN2010/079114
Authority: WO
Inventors: 张海兵; 徐光明; 严华峰
Original assignee: 上海亚明灯泡厂有限公司
Priority date: 2010-07-20
Filing date: 2010-11-25
Publication date: 2012-01-26
Also published as: CN101915369A

Abstract

A white light source module using LEDs includes a substrate, a plurality of white LED lamp beads and red LED lamp beads arranged on the substrate according to the number ratio of 2:1. A blue LED chip is provided in the white LED lamp bead, and the colloid mixed by yellow and green fluorescent powder is coated on the blue LED chip. A red LED chip is provided in the red LED lamp bead. The white light source module using LEDs has a simple structure, and achieves high light emitting efficiency，low color temperature and high color rendering property utilizing only two kinds of LED light beads.

Description

LED white light source module

Technical field

The invention relates to an LED white light source module, in particular to an LED white light source module with high luminous efficiency, low color temperature and high color rendering. Background technique

Since the advent of the blue LED chip, LED lights have developed rapidly. LED is known as the fourth generation of illumination source instead of fluorescent and incandescent lamps because of its high luminous efficiency, good energy saving effect, no pollution and long life.

There are three ways to implement white LEDs:

1. Blue LED plus YAG phosphor, the yellow YAG phosphor coated on top of the blue LED is excited, and the yellow light generated by the phosphor is complementary to the remaining blue light to produce white light;

2, ultraviolet or violet (300 ~ 400nm) LED plus RGB phosphor, the principle is similar to the principle of fluorescent light;

3. Mix three RGB ultra-high brightness LEDs to generate white light using the principle of three primary colors.

Since the LED light source needs to evaluate the luminous flux, luminous efficiency, color temperature and color rendering index, the color rendering index is an important characteristic reflecting the quality of the light source, and its value is determined by the spectral energy distribution of the light source. The white light is obtained by the "blue LED + YAG phosphor powder" method, and the manufacturing process is relatively simple and the cost is low. However, the white light spectrum obtained by this method lacks the red and green portions of the radiation, which limits the light-emitting quality of the light source, resulting in a low color rendering index of the light source, thereby limiting the need for white LEDs to be higher. In the case of the application of the color rendering index, in this case, it is necessary to find ways to improve the color rendering index of the white LED.

At present, an effective way to improve the color rendering index of white LEDs is to increase the color radiation that is missing in the spectrum, especially the red band radiation, which is most effective. This is achieved in two ways in practice: First, adding a red phosphor component to the YAG phosphor (such as patents CN 1677695A, CN 101414604A, and CN 101195742A) or using a YAG phosphor layer in combination with a red phosphor layer The multi-layer phosphor method (such as the patent CN 1953216A); Second, the white LED chip and the red LED chip (such as the patent CN 1937222A) are packaged in the same LED, and the red light emitted by the red LED chip is used to make up for the lack of white light. Limitations of red light radiation. For the former method, the red phosphor has a low luminous efficiency, which causes a decrease in the overall luminous flux. In addition, the consistency of the batch product needs to be improved. For the latter method, since the current blue LED chip uses GaN-based materials, and the red LED chip uses AlGalnP-based materials, the attenuation coefficient is inconsistent due to different materials, and the peak wavelength also drifts, and high color rendering is difficult to maintain after long-term use. Color temperature is also difficult to stabilize. Summary of the invention

In view of the above deficiencies of the prior art, the technical problem to be solved by the present invention is to provide an LED white light source module with high light efficiency, low color temperature and high color rendering.

In order to solve the above technical problem, the present invention adopts the following technical solutions:

An LED white light source module includes a substrate, wherein the substrate is provided with a plurality of white LED lamp beads and a plurality of red LED lamp beads, and the ratio of the white LED lamp beads to the red LED lamp beads is 2: 1, the white LED lamp bead is provided with a blue LED chip, the blue LED chip is coated with a yellow and green phosphor mixed colloid, and the red LED lamp bead is provided with a red LED chip.

Preferably, the blue LED chip has a peak wavelength of 440 to 480 nm, the red LED chip has a peak wavelength of 600 to 670 nm, and the yellow phosphor has an excitation wavelength of 540 to 560 nm, and the green phosphor is excited. The wavelength is from 510 nm to 540 nm.

Preferably, the blue LED chip has a peak wavelength of 450 to 470 nm, and the red LED chip has a peak wavelength of 620 to 650 nm.

Preferably, the weight ratio of the yellow phosphor to the green phosphor in the yellow and green phosphor mixed colloid is in the range of 5:1 to 3:1.

Preferably, the weight ratio of the yellow phosphor to the green phosphor in the yellow and green phosphor mixed colloid is 4:1. Preferably, the white LED lamp bead and the red LED lamp bead are packaged by a copper-based bracket or a ceramic bracket, and the substrate is an aluminum substrate.

Preferably, the plurality of white LED lamp beads and the plurality of red LED lamp beads are uniformly and symmetrically distributed on the substrate. Preferably, the plurality of white LED lamp beads are arranged around the plurality of red LED lamp beads.

Preferably, the power of the white LED lamp bead and the red LED bead is 0. 5W, 1W, 3W or 5W.

Preferably, the LED white light source module is mounted with a matte glass or a PC diffuser.

The above technical solution has the following beneficial effects: The LED white light source module utilizes the blue light emitted by the blue LED chip to excite the yellow-green phosphor to generate yellow-green light, and the yellow-green light and the blue LED chip excite the phosphor, and the remaining blue and red LED chips emit red. Light mixing to obtain a white light source with high luminous efficiency and high color rendering. The LED white light source module can obtain a high-quality white light source by simply mixing two different LED lamp beads, and has a simple structure and convenient manufacture, and in particular, the consistency in mass production is relatively easy to control. DRAWINGS

1 and 2 show two arrangements of LED lamp beads in Embodiment 1 of the present invention. 3 is a relative spectrum diagram of the LED white light source module test of the present invention.

4, 5, and 6 are three arrangement manners of LED lamp beads in Embodiment 2 of the present invention.

7, 8, and 9 are three arrangement manners of LED lamp beads in Embodiment 3 of the present invention.

Where "®" means white LED bead, "®" means red LED bead, and outer ring means substrate.

detailed description

The preferred embodiments of the present invention are described in detail below with reference to the accompanying drawings. Example 1

As shown in FIG. 1 and 2, the LED white light source module has four white LED lamp beads and two red LED lamp beads on the substrate, and the ratio of the white LED lamp beads to the red LED lamp beads is 2: 1. A white LED chip is provided with a blue LED chip, and a red LED chip is provided with a red LED chip. The blue LED chip is coated with a yellow and green phosphor mixed colloid. The weight ratio of the yellow phosphor to the green phosphor in the yellow and green phosphor mixed colloid is in the range of 5:1~3:1, preferably, yellow. The weight ratio of phosphor to green phosphor is 4:1. The peak wavelength of the blue LED chip is 440~480nm, the peak wavelength of the red LED chip is 600~670nm, the excitation wavelength of the yellow phosphor is 540~560nm, and the excitation wavelength of the green phosphor is 510nm~540nm. The peak wavelength of the blue LED chip is preferably in the range of 450 to 470 nm, and the peak wavelength of the red LED chip is preferably in the range of 620 to 650 nm. The white LED lamp bead and the red LED lamp bead are all packaged by a copper-based bracket or a ceramic bracket, and the substrate is made of an aluminum substrate. The packaging method is mature and the production cost is low.

The white LED lamp bead and the red LED bead should be evenly and symmetrically distributed on the substrate. Preferably, the white LED bead is arranged around the plurality of red LED bead, so that the obtained white light is more luminous. , color rendering is better. The distribution method of the white LED lamp bead and the red LED lamp bead can be as shown in Fig. 1. Two red LED lamp beads are placed in the middle position of the aluminum substrate, and four white LED lamp beads are evenly placed on the two red LEDs. The periphery of the lamp bead; as shown in Fig. 2, four white LED lamp beads are placed in the middle of the aluminum substrate, and two red LED lamp beads are placed on both sides. The power of the white LED lamp bead and the red LED bead is generally 0.5W, 1W, 3W or 5W. White LED LED bead and red LED bead are driven by the same current, which is convenient for the production of the driver circuit. The circuit connection can be selected in 6-string or 3-string 2-way mode, which is very convenient.

The LED white light source module utilizes the blue light emitted by the blue LED chip to excite the yellow-green phosphor to generate yellow-green light, and the yellow-green light is mixed with the red light emitted by the blue and red LED chips remaining after the blue LED chip excites the phosphor to obtain a high-efficiency background color. A high-light color white light source. The relative spectrum of the LED white light source module is shown in Figure 3. The measured luminous flux, color rendering, color temperature and other data are shown in the following table: Color temperature (κ) color coordinate x/y color rendering index (Ra) luminous flux (lm) luminous efficacy (lm/W)

3072 0. 4324/0. 4034 89 504 91. 6 It can be seen from the above table that the LED white light source module has high luminous efficiency and good color rendering, which is very suitable for general illumination sources. The LED white light source module is superior to ordinary incandescent lamps and trichromatic fluorescent lamps in terms of color rendering, life and environmental protection, and is of great significance for the development of general lighting in the future. The LED white light source module can obtain a high-quality white light source by simply mixing two different LED lamp beads, and has a simple structure, especially when the mass production is consistent, and the manufacturing is convenient and suitable for mass production. Example 2:

In this embodiment, six white LED lamp beads and three red LED lamp beads are mounted on an aluminum substrate, and three types of arrangement can be selected as shown in FIGS. 4, 5 and 6. In Figure 4, three red LED beads are placed in the middle of the aluminum substrate, and six white LED beads are placed on the periphery of three red LED beads; in Figure 5, three white LED beads are placed in the aluminum. The middle position of the substrate, and three red LED lamp beads and three other white LED lamp beads are placed on the periphery; in Figure 5, three white LED lamp beads are also placed in the middle of the aluminum substrate, and three red The light LED bead and the other three white LED bead are placed on the periphery, but the difference from Figure 5 is that the three outermost red LED bead are placed. The circuit connection can be selected in a 9-string or 3-string 3-way mode. Example 3:

This embodiment is composed of 8 white LED lamp beads and 4 red LED lamp beads mounted on an aluminum substrate, and can be selected as shown in FIG. 7, 8, and 9. In Figure 7, four red LED beads are placed in the middle of the aluminum substrate, while eight white LED beads are placed on the periphery of four red LED beads; in Figure 8, four white LED beads are placed in the aluminum. The middle position of the substrate, and four red LED beads and four other white LED beads are placed on the periphery; in Figure 9, four white LED beads are also placed in the middle of the aluminum substrate, and four red The light LED bead and the other four white LED bead are placed on the periphery, but the difference from Fig. 8 is that four red LED bead are placed on the outermost periphery. The circuit connection can be selected in the form of 12 strings, 6 strings 2 or 3 strings 4 and. The LED white light source module obtained by the above embodiments can be used for making various kinds of lighting fixtures, such as a low color temperature downlight, a low color temperature ceiling light, a low color temperature lighting bulb, and a low color temperature street light. When making lighting fixtures, In addition to the visual difference and glare caused by different LED light bulbs, a matte glass or PC diffuser can be installed on the LED white light source module to achieve uniform light mixing effect, thereby making the lighting fixture more Good light efficiency and color rendering.

The LED white light source module provided by the embodiment of the present invention has been described in detail above. For those skilled in the art, according to the idea of the embodiment of the present invention, there are changes in the specific implementation manner and the application range. The contents of the present specification are not to be construed as limiting the invention, and any changes made in accordance with the inventive concept are all within the scope of the invention.

Claims

Claim

An LED white light source module, comprising a substrate, wherein: the substrate is provided with a plurality of white LED lamp beads and a plurality of red LED lamp beads, the white LED lamp bead and the red LED lamp The number of beads is 2: 1. The white LED lamp bead is provided with a blue LED chip, and the blue LED chip is coated with a yellow and green phosphor mixed colloid, and the red LED lamp bead is provided therein. Red LED chip.

The LED white light source module according to claim 1, wherein: the blue LED chip has a peak wavelength of 440 to 480 nm, and the red LED chip has a peak wavelength of 600 to 670 nm, and the yellow phosphor The excitation wavelength is 540 to 560 nm, and the excitation wavelength of the green phosphor is 510 nm to 540 nm.

The LED white light source module according to claim 2, wherein the blue LED chip has a peak wavelength of 450 to 470 nm, and the red LED chip has a peak wavelength of 620 to 650 nm.

The LED white light source module according to claim 1, wherein: the weight ratio of the yellow phosphor to the green phosphor in the yellow and green phosphor mixed colloid is in the range of 5:1 to 3:1; .

The LED white light source module according to claim 4, wherein the weight ratio of the yellow phosphor to the green phosphor in the yellow and green phosphor mixed colloid is 4:1.

The LED white light source module according to claim 1, wherein the white LED lamp bead and the red LED lamp bead are packaged by a copper-based bracket or a ceramic bracket, and the substrate is an aluminum substrate.

7. The LED white light source module according to claim 1, wherein: the plurality of white LED lamp beads and the plurality of red LED lamp beads are uniformly and symmetrically distributed on the substrate.

8. The LED white light source module according to claim 7, wherein: the plurality of white LED lamp beads are arranged around the plurality of red LED lamp beads.

The power of the white light LED lamp bead or the red LED bead is 0. 5W, 1W, 3W or 5W.

10. The LED white light source module according to claim 1, wherein: the LED white light source module is mounted with a matte glass or a PC diffuser.