WO2012061988A1 - Enabling method of warm white light with high brightness and high color rendering property - Google Patents

Abstract

The present invention refers to an enabling method of warm white light with high brightness and high color rendering property, which includes the following steps: providing a white light part, a red light part with an exciting wavelength of 630-660nm, and an orange light part with an exciting wavelength of 590-610nm, coating a first fluorescent powder layer on the white light part, and coating a second fluorescent powder layer on the red light part with an exciting wavelength of 630-660nm and the orange light part with an exciting wavelength of 590-610nm. The concentration of the fluorescent powder of the second fluorescent powder layer is lower than the concentration of the fluorescent powder of the first fluorescent powder layer. The white light part, the red light part with an exciting wavelength of 630-660nm, and the orange light part with an exciting wavelength of 590-610nm are three chips with different colors, or three LEDs with different colors, or three different light emitting areas of one chip. Electrically connecting the white light part, the red light part with an exciting wavelength of 630-660nm, and the orange light part with an exciting wavelength of 590-610nm, then electrically connecting the power supply, thus warm white light with high brightness and high color rendering property is obtained.

Description

 Method for realizing high brightness and high color rendering warm white light Technical field

The invention relates to the field of semiconductor illumination, in particular to a method for realizing high brightness and high color rendering warm white light.

Background technique

Semiconductor lighting has green environmental protection, long life, high efficiency, energy saving, harsh environment, simple structure, small size, light weight and fast response. Low operating voltage and good safety, it is known as the fourth generation of electric light source after incandescent, fluorescent and energy-saving lamps, or called the 21st century green light source.

At present, the warm white light suitable for illumination on the market is mainly made of blue LED chip and red phosphor. Due to the limitation of the current phosphor production process, the luminous flux of the red phosphor is very low, so that the light effect of warm white light is very low. The color rendering index can only be around 70 to 80, and it is difficult to meet the requirements of lighting products. Therefore, a red LED or a chip is proposed instead of the red phosphor, and a white light is combined with the white LED to realize high color rendering white light. However, due to the red chip process, the red light brightness is difficult to increase, so that the overall warm white light has a lower light efficiency, so it is necessary to further improve the high color rendering warm white light effect.

technical problem

The technical problem to be solved by the invention is to provide a method for realizing high brightness and high color rendering warm white light to solve the problem that the current red light brightness is low and the high color rendering warm white light is not high.

Technical solution

The technical solution adopted to solve the technical problem of the present invention is: a method for realizing high brightness and high color rendering warm white light, which comprises the following steps:

Providing a white light portion, a red light portion having an excitation wavelength of 630 nm to 660 nm, and an orange light portion having an excitation wavelength of 590 nm to 610 nm, the white light portion including a chip of one color, the red light portion having an excitation wavelength of 630 nm to 660 nm and The orange light portion having an excitation wavelength of 590 nm to 610 nm includes two other different color chips, or the white light portion, the red light portion having an excitation wavelength of 630 nm to 660 nm, and the orange portion having an excitation wavelength of 590 nm to 610 nm are three different types. a color LED, or the white light portion and a red light portion having an excitation wavelength of 630 nm to 660 nm and an orange light portion having an excitation wavelength of 590 nm to 610 nm are three different light emitting regions of the same chip; electrically connecting the white light portion and the excitation wavelength The red light portion of 630 nm to 660 nm and the orange light portion having an excitation wavelength of 590 nm to 610 nm are then electrically connected to the power source to obtain high brightness and high color rendering warm white light.

As a further improvement of the method of the present invention, the white light portion is provided with a first phosphor layer, and the red light portion having an excitation wavelength of 630 nm to 660 nm and the orange portion having an excitation wavelength of 590 nm to 610 nm are provided with a second phosphor layer. The phosphor concentration of the red phosphor portion having an excitation wavelength of 630 nm to 660 nm and the orange portion of the excitation wavelength of 590 nm to 610 nm is smaller than the phosphor concentration of the first phosphor layer of the white portion. .

As a further improvement of the method of the present invention, the phosphor concentration of the red phosphor portion having an excitation wavelength of 630 nm to 660 nm and the second phosphor layer of the orange light portion having an excitation wavelength of 590 nm to 610 nm is the first portion of the white light portion The phosphor layer has a phosphor concentration of 10% to 90%.

As a further improvement of the method of the present invention, the white light portion is formed by exciting a yellow or yellow-green phosphor layer by a blue light chip, and the red light portion having an excitation wavelength of 630 nm to 660 nm is red light having an excitation wavelength of 630 nm to 660 nm. Forming a yellow phosphor layer with a yellow or yellow-green phosphor layer coated on a red chip having an excitation wavelength of 630 nm to 660 nm or an orange light chip having an excitation wavelength of 590 nm to 610 nm, the excitation wavelength being The orange portion of 590 nm to 610 nm is formed of an orange light chip having an excitation wavelength of 590 nm to 610 nm and an orange, yellow or yellow-green phosphor layer coated on an orange light chip having an excitation wavelength of 590 nm to 610 nm.

As a further improvement of the method of the present invention, the blue chip has an excitation wavelength of 380 nm to 460 nm.

As a further improvement of the method of the present invention, the white light portion emits a white light color temperature between 3500K and 10000K.

As a further improvement of the method of the present invention, changes in the color temperature are achieved by adjusting the luminance ratio of the white light portion, the red light portion having an excitation wavelength of 630 nm to 660 nm, and the orange light portion having an excitation wavelength of 590 nm to 610 nm.

Beneficial effect

In the prior art, the method for realizing high brightness and high color rendering warm white light has the following beneficial effects:

1. It can effectively improve the light effect of warm white light. When the color rendering index is greater than 85, the light performance of warm white light reaches 100lm/w or more, which is at least 20% higher than that of the prior art products, and is more suitable for illumination.

2. The invention has the advantages of compact design and can be applied to the production of LEDs, LED modules, etc., which can effectively improve the reliability and consistency of the products, and simultaneously utilize mass production of machine equipment.

3, effective control of the amount of phosphors, not only can increase the light efficiency of the product, but also effectively save product costs.

4. By adjusting the brightness of red and white light, LEDs, LED modules and LED chips with different brightness and color temperature segments can be obtained, and different use effects can be obtained to meet the color requirements of different environments.

5. By coating the phosphor on the red light with an excitation wavelength of 630-660 nm and an orange light chip with an excitation wavelength of 590-610 nm, the diffuse reflection of the light is increased, and the red portion and the excitation wavelength of the excitation wavelength of 630-660 nm are increased. It is the light of the orange light part of 590-610nm, so as to achieve the purpose of improving light efficiency.

DRAWINGS

The present invention will be further described below in conjunction with the accompanying drawings and embodiments, in which:

1 is a cross-sectional view showing the structure of a first embodiment of a method for realizing high brightness and high color rendering warm white light according to the present invention;

2 is a cross-sectional view showing the structure of a second embodiment of a method for realizing high brightness and high color rendering warm white light according to the present invention;

Fig. 3 is a cross-sectional view showing the structure of a third embodiment of a method for realizing high brightness and high color rendering warm white light according to the present invention.

Embodiments of the invention

The present invention will be further described in detail below with reference to the accompanying drawings and embodiments. It is understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.

As shown in FIG. 1 , in the first embodiment of the method for realizing high brightness and high color rendering warm white light of the present invention, the high brightness and high color rendering warm white light is realized by a high brightness and color rendering. Warm white LED lights to achieve. The brightness-high color rendering warm white LED lamp comprises a holder 100 having a holder cup 110, and a red chip 20 having an excitation wavelength of 630-660 nm and an excitation wavelength of 590 are fixedly attached to the edge of the holder cup 110 of the holder 100. The orange chip 21 of 610 nm is fixedly connected with four blue chips 30 in the middle of the bracket cup 110 of the bracket 100, wherein the four blue chips 30 are arranged side by side. The red light chip 20 having an excitation wavelength of 630-660 nm, the orange light chip 21 having an excitation wavelength of 590-610 nm, and the blue light chip 30 are connected to the driving circuit through the electrode lines, and the blue light chips 30 are coated with yellow or yellow-green fluorescence. The powder layer 40 (first phosphor layer) is used to generate white light, and then a red light chip 20 having an excitation wavelength of 630-660 nm and an orange light chip 21 having an excitation wavelength of 590-610 nm are coated with a small concentration of yellow. Or the yellow-green phosphor layer 50 (the second phosphor layer) increases the diffuse reflection of the red light having an excitation wavelength of 630-660 nm and the orange light having an excitation wavelength of 590-610 nm, thereby effectively improving the light efficiency of the LED. The bracket cup 110 has an upper groove and a lower groove. The two grooves are stepped. The red chip 20 having an excitation wavelength of 630-660 nm and the orange chip 21 having an excitation wavelength of 590-610 nm are disposed on the concave surface. In the slot, the four blue LED chips 30 are evenly disposed in the lower recess in the middle. The red chip 20 having an excitation wavelength of 630-660 nm and the orange chip 21 having an excitation wavelength of 590-610 nm are disposed at a higher position than the positions of the four blue chips 30. Since the red chip 20 having an excitation wavelength of 630-660 nm and the orange chip 21 having an excitation wavelength of 590-610 nm are located at the edge of the holder cup 110, and the four blue chips 30 are evenly distributed in the center of the holder cup 110, It can effectively reduce the yellow aperture around the spot, make the spot even and the light output is the best.

As shown in FIG. 2, in the second embodiment of the method for realizing high brightness and high color rendering warm white light of the present invention, the method for realizing the high brightness and high color rendering warm white light is realized by an LED chip. . First, the basic epitaxial structure of the white light portion is sequentially completed in the metal organic chemical vapor deposition wafer furnace (MOCVD) from bottom to top: substrate 1, buffer layer 2, N layer 3, quantum well layer 4, P layer 5, current a diffusion layer 6 and a yellow or yellow-green phosphor layer 9 formed on the upper surface of the current diffusion layer 6 by sputtering, adsorption or growth; and then, in the middle of the epitaxial structure of the white portion, the N layer from the white portion The P layer 13, the quantum well layer 14, and the N layer 15 are sequentially grown by re-growth to form a red portion having an excitation wavelength of 630-660 nm, and the growth is sequentially performed from the N layer of the red portion. The layer 16, the quantum well layer 17, and the N layer 18 form a yellow, yellow-green, red or orange phosphor layer 19 on the outside of the N layer 18 by sputtering, adsorption or growth, thereby forming an excitation wavelength of 590- An orange portion of 610 nm; then an N pole 8 is disposed on the N layer 18 of the orange portion having an excitation wavelength of 590-610 nm, and a P pole 7 is disposed on the current diffusion layer 6, and then the LED chip is The P and N poles are processed. Finally, the LED chip chip is diced, tested and sorted, and the desired LED chip capable of realizing high brightness and high color rendering warm white light can be obtained.

As shown in FIG. 3, in the third embodiment of the present invention, a high brightness and high color rendering warm white light is realized by an LED module. The LED module includes a light board 30, and a plurality of high-brightness red LEDs with an excitation wavelength of 630-660 nm are fixed on the light board 30. 41. A white LED 42 and an orange LED 43 having an excitation wavelength of 590-610 nm. Among them, three white LEDs 42 are evenly arranged in the center of the light board 30, five white LEDs 42 and two red LEDs 41 with an excitation wavelength of 630-660 nm and orange LEDs 43 with an excitation wavelength of 590-610 nm are evenly distributed among the three white LEDs. Around the 42nd, the red LED having an excitation wavelength of 630-660 nm includes a red chip with an excitation wavelength of 630-660 nm and a yellow or yellow-green phosphor layer coated on the red chip with an excitation wavelength of 630-660 nm. The red light chip with the excitation wavelength of 630-660 nm is excited to generate red light with an excitation wavelength of 630-660 nm, and the diffused reflection of the phosphor layer is used to increase the red light intensity of the excitation wavelength of 630-660 nm. The orange LED having an excitation wavelength of 590-610 nm comprises an orange light chip with an excitation wavelength of 590-610 nm and a yellow or yellow-green phosphor layer coated on the orange light chip with an excitation wavelength of 590-610 nm, and the excitation wavelength is The orange light chip of 590-610 nm is excited to generate orange light with excitation wavelength of 590-610 nm, and diffuse reflection of the phosphor layer to increase the brightness of orange light with an excitation wavelength of 590-610 nm. By adjusting the red LED with excitation wavelength of 630-660nm 41, white LED 42 and the number of orange LEDs 43 having an excitation wavelength of 590-610 nm or the number of lighted, thereby obtaining different brightnesses and different color temperatures. For example, illuminate two red LEDs with an excitation wavelength of 630-660 nm 41, 8 white LEDs 42 and 1 orange LED 43 with an excitation wavelength of 590-610 nm, the color temperature reaches 2700K. Light up a red LED with excitation wavelength of 630-660nm 41, 8 white LEDs 42 and 3 orange LEDs with an excitation wavelength of 590-610 nm can achieve a color temperature of 4000K. By analogy, the arrangement and combination can achieve different lighting effects.

The invention provides a method for realizing high brightness and high color rendering warm white light, which has the following beneficial effects:

1. It can effectively improve the light effect of warm white light. When the color rendering index is greater than 85, the light performance of warm white light reaches 100lm/w or more, which is at least 20% higher than that of the prior art products, and is more suitable for illumination.

2. The invention has the advantages of compact design and can be applied to the production of LEDs, LED modules, etc., which can effectively improve the reliability and consistency of the products, and simultaneously utilize mass production of machine equipment.

3, effective control of the amount of phosphors, not only can increase the light efficiency of the product, but also effectively save product costs.

4. By adjusting the brightness of red and white light, LEDs, LED modules and LED chips with different brightness and color temperature segments can be obtained, and different use effects can be obtained to meet the color requirements of different environments.

5. By coating the phosphor on the red light with an excitation wavelength of 630-660 nm and an orange light chip with an excitation wavelength of 590-610 nm, the diffuse reflection of the light is increased, and the red portion and the excitation wavelength of the excitation wavelength of 630-660 nm are increased. It is the light of the orange light part of 590-610nm, so as to achieve the purpose of improving light efficiency.

The above is only the preferred embodiment of the present invention, and is not intended to limit the present invention. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the protection of the present invention. Within the scope.

Claims (7)

 1. A method for realizing high brightness and high color rendering warm white light, comprising the steps of: Providing a white light portion, a red light portion having an excitation wavelength of 630 nm to 660 nm, and an orange light portion having an excitation wavelength of 590 nm to 610 nm, the white light portion including a chip of one color, the red light portion having an excitation wavelength of 630 nm to 660 nm and The orange light portion having an excitation wavelength of 590 nm to 610 nm includes two other different color chips, or the white light portion, the red light portion having an excitation wavelength of 630 nm to 660 nm, and the orange portion having an excitation wavelength of 590 nm to 610 nm are three different types. a color LED, or the white light portion and a red light portion having an excitation wavelength of 630 nm to 660 nm and an orange light portion having an excitation wavelength of 590 nm to 610 nm are three different light emitting regions of the same chip; The high-brightness and high-color-developing warm white light is obtained by electrically connecting the white light portion, the red light portion having an excitation wavelength of 630 nm to 660 nm, and the orange light portion having an excitation wavelength of 590 nm to 610 nm, and then electrically connecting the power source. The method for realizing high brightness and high color rendering warm white light according to claim 1, wherein the white light portion is provided with a first phosphor layer, and the excitation wavelength is a red light portion of 630 nm to 660 nm. The orange light portion having an excitation wavelength of 590 nm to 610 nm is provided with a second phosphor layer, the red phosphor portion having an excitation wavelength of 630 nm to 660 nm, and the phosphor of the second phosphor layer having an orange light portion having an excitation wavelength of 590 nm to 610 nm. The concentration is smaller than the phosphor concentration of the first phosphor layer of the white light portion. The method for realizing high brightness and high color rendering warm white light according to claim 2, wherein the excitation light has a red light portion of 630 nm to 660 nm and an orange light portion having an excitation wavelength of 590 nm to 610 nm. The phosphor concentration of the second phosphor layer is 10% to 90% of the phosphor concentration of the first phosphor layer on the white light portion. The method for realizing high brightness and high color rendering warm white light according to claim 1, wherein the white light portion is formed by exciting a yellow or yellow green phosphor layer by a blue chip, and the excitation wavelength is 630 nm. The red portion of -660 nm is formed by a red chip having an excitation wavelength of 630 nm to 660 nm and a yellow or yellow-green phosphor layer coated on a red chip having an excitation wavelength of 630 nm to 660 nm or an excitation wavelength of 590 nm - The 610 nm orange light chip excites the formation of a red phosphor layer. The orange light portion with an excitation wavelength of 590 nm to 610 nm is an orange light chip with an excitation wavelength of 590 nm to 610 nm and an orange light chip coated with an excitation wavelength of 590 nm to 610 nm. An orange, yellow or yellow-green phosphor layer is formed thereon. The method for realizing high brightness and high color rendering warm white light according to claim 4, wherein the blue chip has an excitation wavelength of 380 nm to 460 nm. The method for realizing high brightness and high color rendering warm white light according to claim 1, wherein the white light portion emits a white light color temperature between 3500K and 10000K. The method for realizing high brightness and high color rendering warm white light according to claim 1, wherein the white light portion, the red light portion having an excitation wavelength of 630 nm to 660 nm, and the orange light having an excitation wavelength of 590 nm to 610 nm are adjusted. Part of the brightness ratio to achieve different color temperature changes.

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