CN110649008A - High-color-rendering LED and production method thereof - Google Patents

Abstract

The invention provides a high color rendering LED and a production method thereof. The high color rendering LED includes: a red light chip in the 605-650 nanometer band, a green light chip in the 525-555 nanometer band, and two blue light chips in the 450-475 nanometer band, wherein the red light chip and the green light chip are The rated working current of the blue light chip is the same or equivalent, the four chips are connected in series, and the two blue light chips are covered with yellow light YAG phosphor. The preparation method of the above-mentioned high color rendering LED includes the following steps: fixing a red light chip, a green light chip, and two blue light chips; binding each chip in series; covering the yellow light YAG phosphor on the blue light chip; The high color rendering LED is obtained by using a transparent encapsulating glue as the overall encapsulation of the light-emitting module. The LED light source of the invention increases green light and red light, the proportion of blue light is naturally reduced, and the color rendering property is naturally improved, and the color rendering property is above 95.

Description

A kind of high color rendering LED and its production method

technical field

The invention relates to a high color rendering LED and a production method thereof, belonging to the technical field of LED preparation.

Background technique

The LED white light source generally adopts a synthesis method. One is a white light source that is compositely packaged by multiple chips that emit light of different colors, and the other is a single-color chip and phosphors that are composited to form a white light source.

Due to the inconsistent attenuation of various chips, the white light source packaged with multiple chips is prone to color temperature drift during use. The white light source of the blue light single-chip composite phosphor is prone to the problem of too much blue light and low color rendering.

SUMMARY OF THE INVENTION

In order to solve the above technical problems, the purpose of the present invention is to provide an LED whose color rendering can be improved to more than 90.

In order to achieve the above object, the present invention provides a high color rendering LED, which includes a red light chip with a wavelength of 605-650 nanometers, a green light chip with a wavelength of 525-555 nanometers, and two blue light chips with a wavelength of 450-475 nanometers. Chip, four chips are connected in series, and the two blue chips are covered with yellow light YAG phosphor.

The invention forms a multi-band composite white light through the multi-band light-emitting chip and the excitation fluorescence, specifically, the green light chip, the red light chip, the blue light chip and the yellow light phosphor are compounded and packaged in a bracket to obtain a composite white light with high color rendering. LED.

According to a specific embodiment of the present invention, preferably, the rated working currents of the red light chips, green light chips and blue light chips used in the above-mentioned high color rendering LEDs are the same or equivalent, for example: the rated currents of each chip are 20mA, 150mA , 200mA or 300mA, etc.; there is no requirement for parameters such as chip size and power.

According to a specific embodiment of the present invention, the above-mentioned red light chip can be selected from a red light chip with a wavelength of 630 nanometers.

According to a specific embodiment of the present invention, the green light chip in the 550 nm wavelength band can be selected as the green light chip.

According to a specific embodiment of the present invention, the above-mentioned blue light chip can be selected from a blue light chip with a wavelength of 460 nanometers.

In a specific embodiment of the present invention, the high color rendering LED of the present invention may include one red light chip in the 630 nm band, one green light chip in the 550 nm band, two blue light chips in the 460 nm band, and four chips. connected in series, and the two blue chips are covered with yellow light YAG phosphors.

In the above-mentioned high color rendering LED, preferably, four chips are arranged on a flat support, preferably a flat support with better heat dissipation and light reflection effects.

In the above-mentioned high color rendering LED, preferably, the LED is integrally encapsulated by a transparent encapsulant. The transparent encapsulant used is, for example, epoxy and/or polyester.

The present invention also provides a method for producing the above-mentioned high color rendering LED, which comprises the following steps:

Fix one red light chip, one green light chip, and two blue light chips;

Bond each chip in series;

Cover the yellow light YAG phosphor on the blue light chip;

The LED is obtained by using a transparent encapsulating glue as the overall encapsulation of the light-emitting module.

The LED provided by the present invention can emit light in multiple wavelength bands, including blue light, green light, yellow light, and red light, and therefore has high color rendering. The white light source of the blue single-chip composite phosphor is mainly blue light and yellow light. Therefore, the blue light is relatively high. Because the light source lacks red light, the color rendering is poor. The LED light source of the invention increases green light and red light, the proportion of blue light is naturally reduced, the color rendering property is naturally improved, and the color rendering property is above 95.

LED is a multi-chip packaged white light source, which is a composite light source. If the blue light chip is attenuated, the light source will have relatively more red light, and the color temperature will decrease. The white light emitted by the LED of the present invention can be regarded as two groups, one is red, green and blue composite white light, that is, the chip combination produces white light; the other is blue-yellow composite white light, that is, the blue chip and YAG phosphor are combined to produce white light. Therefore, the present invention The LED has good color temperature stability.

Description of drawings

FIG. 1 is a schematic structural diagram of the high color rendering LED provided in Example 1. As shown in FIG.

FIG. 2 is a graph showing the performance test result of the integrating sphere electric light source of the high color rendering LED provided in Example 1. FIG.

Detailed ways

In order to have a clearer understanding of the technical features, purposes and beneficial effects of the present invention, the technical solutions of the present invention are now described in detail below, but should not be construed as limiting the scope of implementation of the present invention.

Example 1

This embodiment provides a high color rendering LED, the structure of which is shown in FIG. 1 . The LED includes a red light chip in the 630nm band, a green light chip in the 550nm band, and two blue light chips in the 460nm band, wherein the above four chips have the same rated operating current, such as 20mA, 150mA, 200mA or 300mA .

The four chips are connected in series and fixed on the flat support, and the two blue chips are covered with yellow light YAG phosphor. The LED is encapsulated as a whole by a transparent encapsulant.

This LED is produced through the following steps:

1. Fix one 630nm band red light chip, one 550nm band green light chip, and two 460nm band blue light chips on the flat bracket;

2. Set each chip in series;

3. Cover the YAG phosphor on the blue light chip in the 460 nm band;

4. Use transparent encapsulating glue as the overall encapsulation of the light-emitting module to obtain LEDs.

Comparative Example 1

This comparative example provides an LED, which is made of only one blue light chip with a wavelength of 460 nanometers and covered with yellow light YAG phosphor powder. The red light chip and the green light chip are not used. Other structures and preparation processes are the same. Example 1.

Comparative Example 2

This comparative example provides an LED, which is an LED packaged with only one 460-nm-band blue light chip, one 550-nm-band green light chip, and one 630-nm-band red light chip, and does not use yellow YAG phosphors , and other structures and preparation processes are the same as in Example 1.

The integrated sphere electric light source performance comprehensive detector is used to detect the LED and direct detection, and the results are shown in Figure 2. In FIG. 2 , 1-3 represent the LEDs prepared in Comparative Example 1, Comparative Example 2, and Example 1, respectively. It can be seen from the results in Fig. 2 that the LED of Example 1 covers the widest wavelength range and has the highest color rendering, which can reach more than 95.

Claims (10)

1. A high-color rendering LED comprises a red light chip with a wavelength of 605-650 nm, a green light chip with a wavelength of 525-555 nm and two blue light chips with a wavelength of 450-475 nm, wherein rated working currents of the red light chip, the green light chip and the blue light chips are the same or equivalent, the four chips are connected in series, and yellow YAG fluorescent powder covers the two blue light chips.

2. The high color rendering LED of claim 1, wherein the red chip is a 630 nm band red chip.

3. The high color rendering LED of claim 1 or 2, wherein the green chip is a 550 nm band green chip.

4. The high color rendering LED of any one of claims 1-3, wherein the blue chip is a 460 nm band blue chip.

5. The high color rendering LED according to any one of claims 1 to 4, wherein the high color rendering LED comprises a 630 nm band red chip, a 550 nm band green chip, two 460 nm band blue chips, the four chips are connected in series, and the two blue chips are covered with yellow YAG phosphor.

6. The high color rendering LED of claim 1, wherein four chips are disposed on a flat support.

7. The high color rendering LED according to claim 1, wherein the LED is integrally encapsulated by a transparent encapsulating glue.

8. The high color rendering LED of claim 7, wherein the transparent encapsulant comprises epoxy and/or polyester.

9. The high color rendering LED according to claim 1, wherein a rated current of each chip is 20mA, 150mA, 200mA, or 300 mA.

10. Method for producing a high color rendering LED according to any of claims 1 to 9, comprising the steps of:

fixing a red light chip, a green light chip and two blue light chips;

binding each chip in series;

covering yellow YAG fluorescent powder on a blue light chip;

and using transparent packaging glue as the integral packaging of the light-emitting module to obtain the high-color-rendering LED.

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