CN202662604U

CN202662604U - White-light LED (light-emitting diode) with high colour rendering index

Info

Publication number: CN202662604U
Application number: CN2012203812197U
Authority: CN
Inventors: 范国峰
Original assignee: Ke Run Photoelectric Co Ltd Of Shenzhen
Current assignee: Shenzhen branch run Au Optronics Co
Priority date: 2012-08-02
Filing date: 2012-08-02
Publication date: 2013-01-09
Anticipated expiration: 2022-08-02

Abstract

The utility model provides a white-light LED (light-emitting diode) with a high colour rendering index. The white-light LED comprises a substrate and a pad, wherein the pad is fixedly arranged on the substrate, a red-light LED chip, a blue-light LED chip and a yellow-light LED chip are welded on the pad, and the yellow-light LED chip and the red-light LED chip are located on the both sides of the blue-light LED chip. According to the white-light LED provided by the utility model, the blue-light LED chip with a high power, the yellow-light LED chip with a low power and the red-light LED chip with a medium power are correspondingly packaged on the pad via fluorescent glue, the colour temperature of the white-light LED is adjusted by controlling the current of the yellow-light LED chip, and the colour rendering index of the white-light LED is adjusted by controlling the current of the red-light LED chip. Compared with that of the prior art, the colour rendering index of the white-light LED provided by the utility model can reach 97 via the adjustment on the current of the red-light chip; and moreover, the white-light LED provided by the utility model has the advantages of being simple in structure and easy to realize.

Description

A kind of white light LEDs of high color rendering index (CRI)

Technical field

The utility model belongs to the White-light LED illumination technical field, and what be specifically related to is a kind of white light LEDs of high color rendering index (CRI).

Background technology

Development along with the LED technology, make LED become possibility as lighting source, because light source has strict requirement to color rendering index CRI in lighting, and present very ripe aspect color rendering of white light LEDs technology makes it to become restriction LED as the major obstacle of lighting source.White light is complex light, just decomposite easily the versicolor light that comprises in the white light by prism, and LED is comparatively comprehensively light source of a kind of chromatogram, and the characteristics of this wide colour gamut are that the high-color rendering of LED illuminating product has been established theoretical foundation.

The method of making at present the white light great power LED has that the red, green, blue three-primary color LED is synthetic, blue-ray LED+yellow fluorescent powder, ultraviolet LED+three primary colors fluorescent powder and multilayer organic electroluminescent (OLED) etc.Consider the advantage of technology and cost, present mainstream technology is that blue-light LED chip+fluorescent material becomes the white light great power LED, realize white light LEDs by the fluorescent material conversion, this technology is developed by Ri Ya company, the principle of luminosity that has followed in a certain sense fluorescent tube, this technology is because the lacking of ruddiness and green glow composition, and makes it just to exist on congenital defective to the color rendering index deficiency.

The utility model content

The purpose of this utility model is to provide a kind of white light LEDs of high color rendering index (CRI), to solve the defective of the existing color rendering index deficiency of present white light LEDs.

The purpose of this utility model is achieved through the following technical solutions.

A kind of white light LEDs of high color rendering index (CRI), comprise substrate (1) and pad (2), described pad (2) is fixedly installed on the substrate (1), and be welded with a red LED chip (4), a blue-light LED chip (5) and a yellow light LED chip (6) on the pad (2), described yellow light LED chip (6) and red LED chip (4) are positioned at blue-light LED chip (5) both sides.

Also be provided with an encapsulation caps (3) on the wherein said pad (2), be filled with fluorescent glue between this encapsulation caps (3) and the pad (2), described red LED chip (4), blue-light LED chip (5) and yellow light LED chip (6) are encapsulated on the pad (2) by this encapsulation caps (3).

Wherein said yellow light LED chip (6) is that power is less than the low-power LED chip of 100MW; Red LED chip (4) is that power is between the middle power LED chip of 100MW～1W; Blue-light LED chip (5) is that power is greater than the high-power LED chip of 1W.

The white light LEDs of the high color rendering index (CRI) that the utility model provides is encapsulated in the red LED chip of powerful blue-light LED chip, low power yellow light LED chip and middle power on the pad by the fluorescent glue correspondence, thereby realizes that by the electric current of control yellow light LED chip the colour temperature of white light LEDs is adjustable; Thereby realize that by the electric current of control red light chips the color rendering index of white light LEDs is adjustable.Compared with prior art, the utility model is regulated by the electric current to red light chips, can make the color rendering index of white light LEDs reach 97, and the utlity model has simple in structure, the easy advantage of realization.

Description of drawings

Fig. 1 is the white-light LED structure schematic diagram of the utility model high color rendering index (CRI).

Identifier declaration among the figure: substrate 1, pad 2, encapsulation caps 3, red LED chip 4, blue-light LED chip 5, yellow light LED chip 6.

Embodiment

In order to make the purpose of this utility model, technical scheme and advantage clearer, below in conjunction with drawings and Examples, the utility model is further elaborated.Should be appreciated that specific embodiment described herein only in order to explaining the utility model, and be not used in restriction the utility model.

See also shown in Figure 1ly, Fig. 1 is the white-light LED structure schematic diagram of the utility model high color rendering index (CRI).The utility model provides a kind of white light LEDs of high color rendering index (CRI), it has mainly increased a low power red LED chip in the LED encapsulation, by the current regulation control to this red LED chip, the color rendering index of realizing white light LEDs is adjustable, and along with the spectrum of red LED chip increases, reach the purpose of the color rendering index lifting of white light LEDs, efficiently solve the defective of the existing color rendering index deficiency of present white light LEDs.

Simultaneously, the utility model has also been realized the adjustable of white light LED color temperature by the yellow light LED chip that is packaged together, and has avoided Yin Sewen and the problem that causes luminous efficiency to reduce.

Wherein the white light LEDs of high color rendering index (CRI) described in the utility model comprises substrate 1, pad 2 and encapsulation caps 3, and described pad 2 is fixedly installed on the substrate 1, and encapsulation caps 3 is fixed on the pad 2, and is packaged together by filling fluorescent glue and pad 2.

Be welded with on the pad 2 power less than the small-power yellow light LED chip 6 of 100MW, power greater than the high-power blue-light LED chip 5 of 1W and power middle power red LED chip 4 between 100MW～1W, yellow light LED chip 6 and red LED chip 4 are positioned at the both sides of blue-light LED chip 5, and the both sides correspondence of pad 2 is provided with electrode, above-mentioned yellow light LED chip 6, red LED chip 4, blue-light LED chip 5 correspondences are connected with the external drive current circuit by electrode, and the loop here is for mutually independently.

Above-mentioned yellow light LED chip 6, red LED chip 4 and blue-light LED chip 5 are arranged on the pad 2, and after the connection corresponding to the external circuit, by encapsulation caps 3 the fluorescent glue correspondence are encapsulated on the above-mentioned led chip again.

Because the red fluorescence powder material mostly is nitride or silicate, its launching efficiency often its aging decay on the low side is larger, and ruddiness itself on yellow fluorescent powder without impact and itself also do not involve the problem of launching efficiency, therefore can realize significantly promoting of color rendering index to luminous efficiency and the not loss of aging decay of product.The utility model ruddiness, gold-tinted difference electric current adjustable extent are between 0～50mA, by changing the electric current of red LED chips, obvious variation has occured in the spectrogram of white light heavy-power LED product, the red spectrum part strengthens gradually, thereby the color rendering index of the high-power product of white light is got a promotion, luminous efficiency also has obvious lifting at this moment, has fundamentally avoided and has added red fluorescence powder in the yellow fluorescent powder to improve the problem that shows the luminous efficiency decline that refers to and cause.By changing the electric current of yellow wafer, obvious variation has occured in the spectrogram of white light heavy-power LED product, the yellow spectrum part strengthens gradually, thereby make the colour temperature of the high-power product of white light realize adjustable, this moment, luminous efficiency also had obvious lifting, and this technology has avoided fundamentally that yellow fluorescent powder is made the different-colour white light and problem that the luminous efficiency that causes descends.

In sum, the utility model adopts ruddiness and gold-tinted wafer to divide other Current Control, thereby reached the effect that improves color rendering index and controllable color temperature, and avoided the problem of sacrificing luminous efficiency for improving color rendering index, by the Current Control to red wafer, color rendering index is the highest can to reach 97.

The above only is preferred embodiment of the present utility model; not in order to limit the utility model; all any modifications of within spirit of the present utility model and principle, doing, be equal to and replace and improvement etc., all should be included within the protection range of the present utility model.

Claims

1. the white light LEDs of a high color rendering index (CRI), it is characterized in that comprising substrate (1) and pad (2), described pad (2) is fixedly installed on the substrate (1), and be welded with a red LED chip (4), a blue-light LED chip (5) and a yellow light LED chip (6) on the pad (2), described yellow light LED chip (6) and red LED chip (4) are positioned at blue-light LED chip (5) both sides.

2. the white light LEDs of high color rendering index (CRI) according to claim 1, it is characterized in that also being provided with on the described pad (2) encapsulation caps (3), be filled with fluorescent glue between this encapsulation caps (3) and the pad (2), described red LED chip (4), blue-light LED chip (5) and yellow light LED chip (6) are encapsulated on the pad (2) by this encapsulation caps (3).

3. the white light LEDs of high color rendering index (CRI) according to claim 1 is characterized in that described yellow light LED chip (6) is the low-power LED chip of power less than 100MW; Red LED chip (4) is that power is between the middle power LED chip of 100MW～1W; Blue-light LED chip (5) is that power is greater than the high-power LED chip of 1W.