CN201126821Y - led - Google Patents

Abstract

The utility model discloses a light-emitting diode, which comprises a base and a blue light-emitting diode chip fixed on the base, wherein a yellow fluorescent layer is covered on the blue light-emitting diode chip; and the base is also fixedly provided with a red light-emitting diode chip, and the red light-emitting diode chip and the blue light-emitting diode chip are covered in the yellow fluorescent layer together. Preferably, the wavelength of the red light emitting diode chip is 610-640 nm. The utility model discloses a light emitting diode is on the warm white light packaging structure basis of blue light emitting diode chip cooperation yellow phosphor powder, has increased the wavelength and has carried out colour mixture and mixing of colors for 610 to 640 nm's ruddiness emitting diode chip to play the regulation colour temperature effect, realize that the colour temperature from 1500K to 2700K's smooth linear transition and improve the color rendering, can true original object intrinsic colour itself.

Description

Light-emitting diode

Technical field

The utility model relates to a kind of light-emitting diode.

Background technology

Semiconductor lighting is new and effective solid light source, has remarkable advantages such as energy-saving and environmental protection and life-span length.The emergence of the transition of world's lighting industry and emerging semiconductor lighting industry becomes undisputable fact the sixth of the twelve Earthly Branches.The popularity that semiconductor lighting is used with the advance of its technology and product is acknowledged as one of high-tech sector of tool development prospect of 21 century.

Light-emitting diode is as a kind of semiconductor solid luminescence device, it is to utilize the solid semiconductor chip as luminescent material, its luminescence mechanism by diode special form structures shape: diode mainly is made up of PN junction chip, electrode and optical system, after on electrode, adding forward bias, make electronics and hole inject P district and N district respectively, when non-equilibrium minority carrier and majority carrier compound tense, will be luminous energy with unnecessary Conversion of energy with the form of radiation photon.Its luminescence process comprises three parts: the charge carrier injection under the forward bias, recombination radiation and luminous energy transmission.This shows that diode mainly is lean on charge carrier continuous mobile and luminous, LED source does not have filament, the low 1.5-3.5V of operating voltage, can reach 50,000 to 100,000 hours useful life, sharp environmental protection does not have in the production in harmful element, the use and does not send harmful substance, radiationless.

Simply introduce the color of light source below, it comprises the meaning of two aspects: color table and color rendering.The color of seeing during human eye Direct observation light source is called the color table of light source, and chromaticity coordinates, colour temperature etc. is exactly an amount of describing color table; And color rendering is meant the objective effect that the illumination of light source is mapped on the object to be produced: if object of all kinds be subjected to according to after color effects the same when shining with standard sources, think that then the color rendering of this light source is good; Otherwise if the cross-color of object after being subjected to photograph, the color rendering of this light source is just poor.

Common white light emitting diode mainly comprises following two types:

1, use ruddiness, blue light and green light LED chip simultaneously, blue light-emitting diode unit, red light-emitting diode unit and green light LED unit can send blue light, ruddiness and green glow respectively after driving, to be mixed into white light.Because different directions is photochromic to differ, therefore be difficult for mixing out equal white light, its color rendering is low.

2, with blue LED chip collocation yellow fluorescent powder, to produce white light.Wherein, yellow inorganic fluorescent powder is subjected to can sending the fluorescence of yellow after the blue light illumination that blue LED chip sends, and sodium yellow is again with there not being absorbed blue light mixed light to become two wavelength white lights.But adopt the color rendering of light-emitting diode of this structure lower, color reducibility is relatively poor; Particularly when it was used in the general lighting field, its color rendering can't reach the requirement of general lighting.

Summary of the invention

The light-emitting diode that the purpose of this utility model is to provide a kind of adjustable color temperature and improves color rendering.

For achieving the above object, the utility model provides a kind of light-emitting diode, comprises pedestal, is fixed on the blue LED chip on the described pedestal, is coated with the yellow fluorescence layer on the described blue LED chip; Wherein, also be fixed with the red light-emitting diode chip on the described pedestal, described red light-emitting diode chip and described blue LED chip together are capped in the described yellow fluorescence layer.

Preferably, the wavelength of described red light-emitting diode chip is 610～640nm.

Serial or parallel connection between described blue LED chip and the red light-emitting diode chip.

Described red light-emitting diode chip can have a plurality of, serial or parallel connection between each red light-emitting diode chip.

Light-emitting diode of the present utility model is to cooperate on the warm white encapsulating structure basis of yellow fluorescent powder at blue LED chip, increase wavelength and be 610 to 640nm red light-emitting diode chip and carried out colour mixture and toning, regulate the colour temperature effect thereby play, realize the smooth linear of colour temperature from 1500K to 2700K excessively and improve color rendering, can truly reduce the intrinsic color of object itself.Yellow fluorescent powder in the yellow fluorescence layer is subjected to after the blue light illumination that blue LED chip sends, can send the fluorescence of yellow, sodium yellow is again with there not being absorbed blue light mixed light to become warm white, promptly become the warm white of high-color rendering after the ruddiness colour mixture that warm white and red light-emitting diode chip are sent, and have good color reducibility concurrently.Even under the situation of low colour temperature, its color rendering index also can be more than Ra80.

Description of drawings

Fig. 1 is applied to the embodiment schematic diagram of bulb type encapsulating structure for the utility model light-emitting diode;

Fig. 2 is applied to the embodiment schematic diagram of SMD LED surface-mount device LED encapsulating structure for the utility model light-emitting diode.

Below in conjunction with accompanying drawing preferred embodiment of the present utility model is described in further detail.

Embodiment

Figure 1 shows that the utility model light-emitting diode is applied to the embodiment of bulb type encapsulating structure.See also Fig. 1, present embodiment is that a blue LED chip 3 and a wavelength are set in the end formed brilliant cup 2 of a wire support 1 is 610 to 640nm red light-emitting diode chip 4, and this two light-emitting diode chip for backlight unit 3,4 is connected to another wire support 7 by bonding wire 5,6 respectively, two light-emitting diode chip for backlight unit 3,4 is produced with wire support 7 respectively electrically connect.Form serial or parallel connection between described blue LED chip 3 and the red light-emitting diode chip 4.Then, will fill in this crystalline substance cup 2, form the yellow fluorescence layer 8 that is covered on this two light-emitting diode chip for backlight unit 3,4 by the yellow fluorescent powder that Yellow luminous material etc. constitutes.Then, encapsulate with the packing colloid 9 of printing opacity and become a bulb type light-emitting diode.Yellow fluorescent powder in the yellow fluorescence layer 8 is subjected to after the blue light illumination that blue LED chip sends, can send the fluorescence of yellow, sodium yellow with there not being absorbed blue light mixed light to become warm white, promptly becomes the warm white of high-color rendering again after the ruddiness colour mixture that warm white and red light-emitting diode chip are sent.

Figure 2 shows that the utility model light-emitting diode is applied to the embodiment of SMD LED surface-mount device LED encapsulating structure.See also Fig. 2, present embodiment is to be provided with one that a blue LED chip 12 and a wavelength are set on the substrate 11 of layer printed circuit board 10 is 610 to 640nm red light-emitting diode chip 13, and this two light-emitting diode chip for backlight unit 12,13 is connected to layer printed circuit board 10 by two assembly welding lines 14,15 respectively, two light-emitting diode chip for backlight unit 12,13 is produced with layer printed circuit board 10 respectively electrically connect.Form serial or parallel connection between described blue LED chip 3 and the red light-emitting diode chip 4.Then, on this two light-emitting diode chip for backlight unit 12,13, apply the yellow fluorescent powder that constitutes by Yellow luminous material etc., form the yellow fluorescence layer 16 that is covered on this two light-emitting diode chip for backlight unit 12,13.Then, the packing colloid 17 with printing opacity on this structure encapsulates, and becomes a surface-mounting LED.Yellow fluorescent powder in the yellow fluorescence layer 16 is subjected to after the blue light illumination that blue LED chip sends, can send the fluorescence of yellow, sodium yellow with there not being absorbed blue light mixed light to become warm white, promptly becomes the warm white of high-color rendering again after the ruddiness colour mixture that warm white and red light-emitting diode chip are sent.

Light-emitting diode of the present utility model is to cooperate on the warm white encapsulating structure basis of yellow fluorescent powder at blue LED chip, increase wavelength and be 610 to 640nm red light-emitting diode chip and carry out colour mixture and toning, thereby play the effect of regulating colour temperature, improving color rendering.

Above-described only is preferred embodiment of the present utility model.Should be pointed out that for the person of ordinary skill of the art, under the prerequisite that does not break away from the present utility model design, can also make some distortion and improvement, these changes and change should be considered as belonging to protection range of the present utility model.For example, described red light-emitting diode chip can be provided with a plurality of, forms the serial or parallel connection relation between each red light-emitting diode chip.

Claims (4)

1, light-emitting diode comprises

Pedestal;

Be fixed on the blue LED chip on the described pedestal;

Be coated with the yellow fluorescence layer on the described blue LED chip;

It is characterized in that:

Also be fixed with the red light-emitting diode chip on the described pedestal;

Described red light-emitting diode chip and described blue LED chip together are capped in the described yellow fluorescence layer.

2, according to the described light-emitting diode of claim 1, it is characterized in that:

The wavelength of described red light-emitting diode chip is 610～640nm.

3, according to claim 1 or 2 described light-emitting diodes, it is characterized in that:

Serial or parallel connection between described blue LED chip and the red light-emitting diode chip.

4, according to claim 1 or 2 described light-emitting diodes, it is characterized in that:

Described red light-emitting diode chip has a plurality of, serial or parallel connection between each red light-emitting diode chip.

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